CRC · California Residential Code

Sizing, slope and materials for building drains and sewers

Q: What is the single fastest way to avoid sewer clog problems?

Keep the horizontal runs uniformly sloped at 1/4 in/ft and avoid sags or variable slope — this preserves self‑scouring velocity (see §708.1).

Q: Can I run my building sewer at a lesser slope because the street sewer is deep?

You may request AHJ approval to reduce slope; for 4 in. and larger pipes the code allows 1/8 in/ft (with approval) when 1/4 in/ft is impractical — see §708.1.

Q: Where does the “building sewer” material requirement begin?

The material requirement applies to the building sewer beginning 2 feet (610 mm) from the building ; materials must be those prescribed in the code and applicable referenced standards — §715.1.

This page explains the California code basics: horizontal building drains should be run at a uniform minimum slope of 1/4 in/ft toward disposal (exceptions require AHJ approval), building‑sewer materials (starting 2 ft from the building) must be selected from the code’s approved materials (Table 701.2), and sewer sizing is based on fixture units — check the referenced tables and local amendments when designing or installing sewers.

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Last reviewed: July 6, 2026

What the code requires — 2-4 sentences

Building drains and sewers must be run at a uniform minimum slope of 1/4 inch per foot toward the point of disposal (see §708.1). Where slope is impractical the code allows reduced slopes for larger pipes with prior approval from the Authority Having Jurisdiction (see §708.1). The building sewer (starting 2 ft from the building) must be constructed of materials prescribed by the code (see §715.1 and Table 701.2) — selected materials and joining methods must conform to the referenced standards.

The single most important rule: run horizontal drains with a uniform slope of at least 1/4 in/ft toward the disposal point; if you cannot, get AHJ approval before reducing slope.

Requirements in detail

Slope / grade

Minimum uniform slope for building drain and other horizontal drainage piping: 1/4 inch per foot (2%) toward point of disposal — §708.1.
Exception (AHJ approval required): where it is impractical to obtain 1/4 in/ft:
- For pipes 4 inches (100 mm) or larger, slope may be reduced to 1/8 inch per foot (1%) (when approved).
Practical notes:
- Slope must be uniform and piping run in practical alignment; avoid sags or dips that trap solids or reduce self‑scouring. §708.1.

Materials (what you may use)

The code requires that the building sewer, beginning 2 feet (610 mm) from a building, be of materials “as prescribed in this code” — §715.1.
The code’s tables and referenced standards list approved materials for aboveground and underground drainage (examples shown below). See Table 701.2 for full, authoritative material lists and referenced standards.

Typical approved material (examples)	Typical use / notes	Code Reference
Cast‑iron soil pipe (ASTM A74 / A888)	Common for DWV and where heavy loads or fire resistance required	§701.2 (see referenced standards)
PVC (Schedule 40 DWV, ASTM D1785 / D2665)	Widely used for aboveground and underground DWV (follow manufacturer and fire/installation limits)	§701.2 / §715.1
ABS (Schedule 40 DWV)	Permitted with limits (see jurisdictional and fire restrictions)	§701.2
PE (polyethylene) — trenchless replacement / bursting (ASTM F714)	Allowed for trenchless replacement methods (see §715.3.2)	§715.3.2
Vitrified clay / ductile iron / stainless steel	Allowed where referenced standards apply (use appropriate joints and couplings)	§701.2 / §715.1

Important: material selection must also meet referenced standards and any local limitations (for example, some agencies limit ABS/PVC in certain occupancies) — see the materials table and referenced ASTM/ASME standards listed in the code.

Sizing (how large the pipe must be)

The code determines minimum sizes by the total number of drainage fixture units (DFU) connected; building sewer minimum size is based on fixture units and shall not be smaller than the building drain (see §717.1 and tables for DFU capacities).
Use the drainage sizing tables (Table 703.2 for drains/venting and Table 717.1 / Appendix C for building sewers) to translate DFU to pipe diameter and required slope. Example capacity numbers are given in those tables (see table excerpts).

Decision factor	Typical code values you will use	Code Reference
Minimum slope for horizontal drainage	1/4 in/ft (2%) — Exception slopes 1/8 in/ft (1%) for ≥4" if AHJ approves	§708.1
Minimum material requirements location	building sewer starting 2 ft from building must be of approved materials	§715.1
Sizing basis	Total fixture units; building sewer not smaller than building drain — consult Table 703.2 / Table 717.1	§703.1 / §717.1
Cleanout spacing (affects accessible sizing/maintenance)	Building sewer cleanouts at intervals not to exceed 100 ft in straight runs	§719.1

Exceptions & special cases

Reduced slope allowances are permitted only when it is impractical to obtain 1/4 in/ft due to depth/structural constraints — and must be approved by the Authority Having Jurisdiction. For pipes 4 in. and larger, the code allows 1/8 in/ft under that approval. §708.1.
The code permits trenchless rehabilitation (pipe lining or pipe bursting) subject to referenced ASTM standards (see §715.3, §715.3.1, §715.3.2). Materials and methods for these repairs are specifically referenced (e.g., ASTM F1216 for lining; ASTM F714 for PE pipe bursting).
Local jurisdictions may restrict certain plastics (ABS, PVC) in specific applications or occupancies — consult Table 701.2 notes and local amendments; the code notes jurisdictional limits (e.g., HCD, OSHPD).

Common mistakes

Assuming any downward slope is acceptable — the code requires a uniform slope of at least 1/4 in/ft (unless approved otherwise). Do not leave sagging or varying slope segments. §708.1.
Using an underground material that is only listed for aboveground use (or vice versa) — check Table 701.2 and the referenced standards for permitted locations and uses.
Choosing a building sewer smaller than the building drain — the code explicitly prohibits that (see sizing provisions; building sewer shall be no smaller than the building drain).
Forgetting cleanouts or spacing them farther than allowed — building sewer cleanouts are required at intervals not to exceed 100 ft in straight runs (and at horizontal directional changes) — §719.1.

Worked example — residential, concrete numbers

Scenario: A single‑family house will connect fixtures totaling 12 DFU to a building drain and sewer. The site has normal grade (no AHJ slope waiver).

Sizing: Consult the drainage tables (Table 703.2 / Table 717.1). For many common fixture-load tables, a horizontal drainage pipe sized at 4 inches will typically handle modest DFU counts for a single dwelling; the building sewer must be sized from the total DFU (see §717.1). Confirm in Table 717.1 or Table 703.2 for the exact DFU‑to‑diameter mapping for your DFU value.
Slope: With normal conditions, provide a uniform slope of 1/4 in/ft for the horizontal building drain and sewer (per §708.1). If the sewer run is deep or a conflict makes 1/4 in/ft impractical, you must get AHJ approval to reduce slope (for example to 1/8 in/ft for ≥4" pipe).
Materials: Choose a material listed for the application in Table 701.2 (examples: PVC DWV, cast‑iron, ABS) and install joints per the required standards and the code’s joints sections; building sewer material selection must comply with §715.1 (start 2 ft from the building) and referenced standards.
Cleanouts and access: Provide cleanouts at the building drain/sewer connection and at intervals not exceeding 100 ft in straight runs; extend required cleanouts to grade. §719.1.

(Notes: Always check the actual DFU tables that apply to your fixtures, and confirm local jurisdictional amendments that may change allowable materials or slopes.)

Commonly referenced related provisions

§708.1 — Grade of horizontal drainage piping (minimum slopes & exceptions).
§701.2 — Materials (Table 701.2 lists approved DWV / sewer materials and referenced standards).
§715.1 — Building sewer materials (sewer beginning 2 ft from building must be approved materials).
§717.1 — Size of building sewers (minimum size based on total fixture units; building sewer not smaller than building drain).
§719.1 — Cleanouts (locations, intervals, extension to grade).
§715.3 — Trenchless rehabilitation and material standards for existing sewers (ASTM references).

Code references

Grounded in the retrieved California Residential Code — click a citation to read the verbatim passage:

CRC § 703.2 High relevance — show source text

Col1	ON BUILDING SEWER PIPING*	Col3	Col4
SIZE OF PIPE (inches)	SLOPE (inches per foot)	SLOPE (inches per foot)	SLOPE (inches per foot)
SIZE OF PIPE (inches)	1⁄16	1⁄8	1⁄4
6 and smaller	(As specified in Table 703.2/ No minimum loading)	(As specified in Table 703.2/ No minimum loading)	(As specified in Table 703.2/ No minimum loading)
8	1950/1500	2800/625	3900/275
10	3400/1600	4900/675	6800/300
12	5600/1700	8000/725	11 200/325

For SI units: 1 inch = 25 mm, 1 inch per foot = 83.3 mm/m

See also Appendix H, Private Sewage Disposal Systems. For alternate methods of sizing drainage piping, see Appendix C.

717.2 Meat and Poultry Processing Plants. [AGR] The sewer system shall have the capacity to remove all waste from the various processing and cleaning operations and to mini- mize or prevent stoppage and surcharging at the system.

718.0 Grade, Support, and Protection of Building Sewers.

718.1 Slope. Building sewers shall be run in practical alignment and at a uniform slope of not less than [1] ⁄ 4 inch per foot (20.8 mm/m) toward the point of disposal.

Exception: Where approved by the Authority Having Jurisdiction and where it is impractical, due to the depth of the street sewer, the structural features or the arrangement of a building or structure, to obtain a slope of [1] ⁄ 4 inch per foot (20.8 mm/m), piping 4 inches (100 mm) through 6 inches (150 mm) shall be permitted to have a slope of not less than [1] ⁄ 8 inch per foot (10.4 mm/m) and piping 8 inches (200 mm) and larger shall be permitted to have a slope of not less than [1] ⁄ 16 inch per foot (5.2 mm/m). The maximum and minimum fixture unit loading shall be in accordance with Table 717.1. 718.2 Support. Building sewer piping shall be laid on a firm bed throughout its entire length, and such piping laid in made or filled-in ground shall be laid on a bed of approved materials and shall be properly supported as required by the Authority Having Jurisdiction. 718.3 Protection from Damage. No building sewer or other drainage piping or part thereof, which is constructed of materials other than those approved for use under or within a building, shall be installed under or within 2 feet (610 mm) of a building or structure, or part thereof, nor less than 1 foot (305 mm) below the surface of the ground.

CRC § 718.0 High relevance — show source text
718.0 Grade, Support, and Protection of Building Sewers.

718.1 Slope. Building sewers shall be run in practical alignment and at a uniform slope of not less than [1] ⁄ 4 inch per foot (20.8 mm/m) toward the point of disposal.

Exception: Where approved by the Authority Having Jurisdiction and where it is impractical, due to the depth of the street sewer, the structural features or the arrangement of a building or structure, to obtain a slope of [1] ⁄ 4 inch per foot (20.8 mm/m), piping 4 inches (100 mm) through 6 inches (150 mm) shall be permitted to have a slope of not less than [1] ⁄ 8 inch per foot (10.4 mm/m) and piping 8 inches (200 mm) and larger shall be permitted to have a slope of not less than [1] ⁄ 16 inch per foot (5.2 mm/m). The maximum and minimum fixture unit loading shall be in accordance with Table 717.1. 718.2 Support. Building sewer piping shall be laid on a firm bed throughout its entire length, and such piping laid in made or filled-in ground shall be laid on a bed of approved materials and shall be properly supported as required by the Authority Having Jurisdiction. 718.3 Protection from Damage. No building sewer or other drainage piping or part thereof, which is constructed of materials other than those approved for use under or within a building, shall be installed under or within 2 feet (610 mm) of a building or structure, or part thereof, nor less than 1 foot (305 mm) below the surface of the ground. The provisions of this subsection include structures such as porches and steps, whether covered or uncovered; breezeways; roofed porte cochere; roofed patios; carports; covered walks; covered driveways; and similar structures or appurtenances.

TABLE 717.1

MAXIMUM/MINIMUM FIXTURE UNIT LOADING

For SI units: 1 inch = 25 mm, 1 inch per foot = 83.3 mm/m
- See also Appendix H, Private Sewage Disposal Systems. For alternate methods of sizing drainage piping, see Appendix C.
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SANITARY DRAINAGE

719.0 Cleanouts.

719.1 Locations. Cleanouts shall be placed inside the building near the connection between the building drain and the building sewer or installed outside the building at the lower end of the building drain and extended to grade.

Additional building sewer cleanouts shall be installed at intervals not to exceed 100 feet (30 480 mm) in straight runs and for each aggregate horizontal change in direction exceeding 135 degrees (2.36 rad). 719.2 No Additional Cleanouts. Where a building sewer or a branch thereof does not exceed 10 feet (3048 mm) in length and is a straight-line projection from a building drain that is provided with a cleanout, no cleanout will be required at its point of connection to the building drain. 719.3 Building Sewer Cleanouts. Required building sewer cleanouts shall be extended to grade and shall be in accordance with the appropriate sections of cleanouts, Section 707.0, for sizing, construction, and materials.

CRC § 1103.0 High relevance — show source text

1103.0 Size of Leaders, Conductors, and Storm Drains.

1103.1 Vertical Conductors and Leaders. Vertical conductors and leaders shall be sized by the maximum projected roof area and Table 1103.1.

1103.2 Size of Horizontal Storm Drains and Sewers. The size of building storm drains, or building storm sewers or their horizontal branches shall be based on the maximum projected roof or paved area to be handled and Table 1103.2.

1103.3 Size of Roof Gutters. The size of semi-circular gutters shall be based on the maximum projected roof area and Table 1103.3.

1103.4 Side Walls Draining onto a Roof. Where vertical walls project above a roof to permit storm water to drain into the roof area below, the adjacent roof area shall be permitted to be computed from Table 1103.1 as follows:

(1) For one wall – add 50 percent of the wall area to the roof area figures.

(2) For two adjacent walls of equal height – add 35 percent of the total wall areas.

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STORM DRAINAGE

Col1	Col2	TABLE 1103.1 SIZING ROOF DRAINS, LEADERS, AND VERTICAL RAINWATER PIPING2, 3	Col4	Col5	Col6	Col7	Col8	Col9	Col10	Col11	Col12	Col13	Col14
SIZE OF DRAIN, LEADER, OR PIPE	FLOW	MAXIMUM ALLOWABLE HORIZONTAL PROJECTED ROOF AREAS AT VARIOUS RAINFALL RATES (square feet)	MAXIMUM ALLOWABLE HORIZONTAL PROJECTED ROOF AREAS AT VARIOUS RAINFALL RATES (square feet)	MAXIMUM ALLOWABLE HORIZONTAL PROJECTED ROOF AREAS AT VARIOUS RAINFALL RATES (square feet)	MAXIMUM ALLOWABLE HORIZONTAL PROJECTED ROOF AREAS AT VARIOUS RAINFALL RATES (square feet)	MAXIMUM ALLOWABLE HORIZONTAL PROJECTED ROOF AREAS AT VARIOUS RAINFALL RATES (square feet)	MAXIMUM ALLOWABLE HORIZONTAL PROJECTED ROOF AREAS AT VARIOUS RAINFALL RATES (square feet)	MAXIMUM ALLOWABLE HORIZONTAL PROJECTED ROOF AREAS AT VARIOUS RAINFALL RATES (square feet)	MAXIMUM ALLOWABLE HORIZONTAL PROJECTED ROOF AREAS AT VARIOUS RAINFALL RATES (square feet)	MAXIMUM ALLOWABLE HORIZONTAL PROJECTED ROOF AREAS AT VARIOUS RAINFALL RATES (square feet)	MAXIMUM ALLOWABLE HORIZONTAL PROJECTED ROOF AREAS AT VARIOUS RAINFALL RATES (square feet)	MAXIMUM ALLOWABLE HORIZONTAL PROJECTED ROOF AREAS AT VARIOUS RAINFALL RATES (square feet)	**MAXIMUM

CRC § 715.2 High relevance — show source text

715.2 Joining Methods and Materials. Joining methods and materials shall be as prescribed in this code.

715.3 Existing Sewers. Where permitted by the Authority Having Jurisdiction, trenchless methods of rehabilitation of existing building sewer and building storm sewers shall be installed in accordance with Section 715.3.1 or Section 715.3.2.

715.3.1 Sewer Pipe Lining. For trenchless installation of resin-impregnated flexible tubing to line existing building sewers and building storm sewers installation shall be in accordance with ASTM F1216, ASTM F2561, ASTM F2599, or ASTM F3240.

715.3.2 Sewer Pipe Replacement. For trenchless installation of polyethylene (PE) pipe using the pipe bursting method to replace existing building sewers and building storm sewers materials shall be in accordance with ASTM F714.

716.0 Markings.

716.1 General. Pipe, brick, block, prefabricated septic tanks, prefabricated septic tank or seepage pit covers, or other parts or appurtenances incidental to the installation of building sewers or private sewage disposal systems shall be in accordance with the approval requirements of Chapter 3 of this code.

717.0 Size of Building Sewers. 717.1 General. The minimum size of a building sewer shall be determined on the basis of the total number of fixture units drained by such sewer, in accordance with Table 717.1. No building sewer shall be smaller than the building drain.

For alternate methods of sizing building sewers, see Appendix C.

TABLE 717.1

MAXIMUM/MINIMUM FIXTURE UNIT LOADING

Col1	ON BUILDING SEWER PIPING*	Col3	Col4
SIZE OF PIPE (inches)	SLOPE (inches per foot)	SLOPE (inches per foot)	SLOPE (inches per foot)
SIZE OF PIPE (inches)	1⁄16	1⁄8	1⁄4
6 and smaller	(As specified in Table 703.2/ No minimum loading)	(As specified in Table 703.2/ No minimum loading)	(As specified in Table 703.2/ No minimum loading)
8	1950/1500	2800/625	3900/275
10	3400/1600	4900/675	6800/300
12	5600/1700	8000/725	11 200/325

For SI units: 1 inch = 25 mm, 1 inch per foot = 83.3 mm/m

See also Appendix H, Private Sewage Disposal Systems. For alternate methods of sizing drainage piping, see Appendix C.

718.0 Grade, Support, and Protection of Building Sewers.

CRC § 601.8 High relevance — show source text
C 601.8 Prohibited Connections Near Base of Stack. Where stacks are more than 75 feet (22 860 mm) high, a separate stack shall be provided for the fixtures on the lower two stories. The stack for the lower two stories shall be permitted to be connected to the branch of the building drain that serves the stack for the upper stories at a point that is not less than 8 feet (2438 mm) downstream from the base of the upper stack. Where stacks are less than 75 feet (22 860 mm) high but more than two stories high, the lowest story shall not connect within 8 feet (2438 mm) downstream from the base of the stack. Venting for the lowest story shall be provided in accordance with Section C 601.8.1 and Section C 601.8.2.

C 601.8.1 Conditional Vent. Venting of fixtures on the lowest floor shall be in accordance with Section 908.0 through Section 911.5 and may connect into the single-stack as a conditional vent. The conditional vent connects into the stack by means of a wye-fitting to prevent ingress of drainage into the vent. No more than 12 drainage fixture units (DFU) may be connected into the conditional vent and shall connect not less than 8 feet (2438 mm) above the stack base.

C 601.8.2 Other Branch Vent. Other branch vents shall be vented in accordance with Section 908.0 through Section 911.5.

C 601.9 Sizing Building Drains and Sewers. In a single-stack vent system, the building drain and branches thereof shall be sized in accordance with Table 703.2, and the building sewer shall be sized in accordance with Table 717.1. C 601.10 Parallel Vent Stacks. Drainage stacks extending more than 75 feet (22 860 mm) shall be provided with a parallel vent stack and shall meet the requirements of Section 907.0.

2025 CALIFORNIA PLUMBING CODE 393

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CALIFORNIA PLUMBING CODE – MATRIX ADOPTION TABLE

APPENDIX D - SIZING STORM WATER DRAINAGE SYSTEMS

(Matrix Adoption Tables are non-regulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)

CRC § 83.3 High relevance — show source text

FROM STACKS**|MAXIMUM NUMBER OF DRAINAGE FIXTURE UNITS FOR SANITARY BUILDING DRAINS AND RUNOUTS FROM STACKS| |DIAMETER
OF PIPE
(inches)|SLOPE (inches per foot)|SLOPE (inches per foot)|SLOPE (inches per foot)|SLOPE (inches per foot)| |DIAMETER
OF PIPE
(inches)|1⁄16|1⁄8|1⁄4|1⁄2| |2|–|–|21|26| |21⁄2|–|–|24|31| |3|–|20|422|502| |4|–|180|216|250| |5|–|390|480|575| |6|–|700|840|1000| |8|1400|1600|1920|2300| |10|2500|2900|3500|4200| |12|3900|4600|5600|6700| |15|7000|8300|10 000|12 000|

For SI units: 1 inch = 25 mm, 1 inch per foot = 83.3 mm/m

Notes:

1 On-site sewers that serve more than one building shall be permitted to be sized according to the current standards and specifications of the administrative authority for public sewers.

2 A maximum of two water closets or two bathroom groups, except in single-family dwellings, where a maximum of three water closets or three bathroom groups shall be permitted to be installed.

Col1	TABLE C 304.3 HORIZONTAL FIXTURE BRANCHES AND STACKS	Col3	Col4	Col5
DIAMETER OF PIPE (inches)	MAXIMUM NUMBER OF DRAINAGE FIXTURE UNITS	MAXIMUM NUMBER OF DRAINAGE FIXTURE UNITS	MAXIMUM NUMBER OF DRAINAGE FIXTURE UNITS	MAXIMUM NUMBER OF DRAINAGE FIXTURE UNITS
DIAMETER OF PIPE (inches)	HORIZONTAL FIXTURE BRANCH1	ONE STACK OF THREE OR FEWER BRANCH INTERVALS	STACKS WITH MORE THAN THREE BRANCH INTERVALS	STACKS WITH MORE THAN THREE BRANCH INTERVALS
DIAMETER OF PIPE (inches)	HORIZONTAL FIXTURE BRANCH1	ONE STACK OF THREE OR FEWER BRANCH INTERVALS	TOTAL FOR STACK	**TOTAL AT ONE

CRC § 601.8.2 Medium relevance — show source text

C 601.8.2 Other Branch Vent. Other branch vents shall be vented in accordance with Section 908.0 through Section 911.5.

C 601.9 Sizing Building Drains and Sewers. In a single-stack vent system, the building drain and branches thereof shall be sized in accordance with Table 703.2, and the building sewer shall be sized in accordance with Table 717.1. C 601.10 Parallel Vent Stacks. Drainage stacks extending more than 75 feet (22 860 mm) shall be provided with a parallel vent stack and shall meet the requirements of Section 907.0.

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CALIFORNIA PLUMBING CODE – MATRIX ADOPTION TABLE

APPENDIX D - SIZING STORM WATER DRAINAGE SYSTEMS

(Matrix Adoption Tables are non-regulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)

Adopting Agency	BSC	BSC- CG	SFM	HCD	Col6	Col7	DSA	Col9	Col10	OSHPD	Col12	Col13	Col14	Col15	Col16	Col17	BSCC	DPH	AGR	DWR	CEC	CA	SL	SLC
Adopting Agency	BSC	BSC- CG	SFM	1	2	1-AC	AC	SS	SS/CC	1	1R	2	3	4	5	6	6	6	6	6	6	6	6	6
Adopt Entire Chapter	X			X	X			X		X	X	X	X	X	X	X
Adopt Entire Chapter as amended (amended sections listed below)
Adopt only those sections that are listed below
Chapter/Section

This state agency does not adopt sections identified with the following symbol: The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.0.

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CRC § 1101.16 Medium relevance — show source text
1101.16 Leaders, Conductors, and Connections. Leaders or conductors shall not be used as soil, waste, or vent pipes nor shall soil, waste, or vent pipes be used as leaders or conductors.

1101.16.1 Protection of Leaders. Leaders installed along alleyways, driveways, or other locations where exposed to damage shall be protected by metal guards, recessed into the wall, or constructed from the ferrous pipe. 1101.16.2 Combining Storm with Sanitary Drainage. The sanitary and storm drainage system of a building shall be entirely separate, except where a combined sewer is used, in which case the building storm drain shall be connected in the same horizontal plane through a single wye fitting to the combined building sewer not less than 10 feet (3048 mm) downstream from a soil stack.

1102.0 Roof Drains.

1102.1 Applications. Roof drains shall be constructed of aluminum, cast-iron, copper alloy of not more than 15 percent zinc, leaded nickel bronze, stainless steel, ABS, PVC, polypropylene, polyethylene, or nylon and shall comply with ASME A112.3.1 or ASME A112.6.4.

1102.2 Dome Strainers Required. Roof drains shall have domed strainers.

Exception: Roof drain strainers for use on sun decks, parking decks, and similar areas that are normally serviced and maintained, shall be permitted to be of the flat surface type. Such roof drain strainers shall be level with the deck.

1102.3 Roof Drain Flashings. The connection between the roof and roof drains that pass through the roof and into the interior of the building shall be made watertight by the use of proper flashing material. 1102.3.1 Lead Flashing. Where lead flashing material is used, it shall be not less than 4 pounds per square foot (lb/ft [2] ) (19 kg/m [2] ). 1102.3.2 Copper Flashing. Where copper flashing material is used, it shall be not less than 12 ounces per square foot (oz/ft [2] ) (3.7 kg/m [2] ).

1103.0 Size of Leaders, Conductors, and Storm Drains.

1103.1 Vertical Conductors and Leaders. Vertical conductors and leaders shall be sized by the maximum projected roof area and Table 1103.1.

1103.2 Size of Horizontal Storm Drains and Sewers. The size of building storm drains, or building storm sewers or their horizontal branches shall be based on the maximum projected roof or paved area to be handled and Table 1103.2.

1103.3 Size of Roof Gutters. The size of semi-circular gutters shall be based on the maximum projected roof area and Table 1103.3.

1103.4 Side Walls Draining onto a Roof. Where vertical walls project above a roof to permit storm water to drain into the roof area below, the adjacent roof area shall be permitted to be computed from Table 1103.1 as follows:

(1) For one wall – add 50 percent of the wall area to the roof area figures.

(2) For two adjacent walls of equal height – add 35 percent of the total wall areas.

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CRC § 2.25 Medium relevance — show source text
00|2.25|0.70|DR|3.70|1.05|DR|DR| |Minimum 33
mil steel
furring or
minimum
1x wood
furringc|33 mil cold-
formed steel
stud|#10 screw|Steel thick-
ness plus 3
threads|16|3.85|1.45|DR|DR|3.40|DR|DR|DR| |Minimum 33
mil steel
furring or
minimum
1x wood
furringc|33 mil cold-
formed steel
stud|#10 screw|Steel thick-
ness plus 3
threads|24|3.40|DR|DR|DR|2.70|DR|DR|DR| |Minimum 33
mil steel
furring or
minimum
1x wood
furringc|43 mil or
thicker cold-
formed steel
stud|#8 Screw|Steel thick-
ness plus 3
threads|12|3.00|1.80|DR|DR|3.00|0.65|DR|DR| |Minimum 33
mil steel
furring or
minimum
1x wood
furringc|43 mil or
thicker cold-
formed steel
stud|#8 Screw|Steel thick-
ness plus 3
threads|16|3.00|1.00|DR|DR|2.85|DR|DR|DR| |Minimum 33
mil steel
furring or
minimum
1x wood
furringc|43 mil or
thicker cold-
formed steel
stud|#8 Screw|Steel thick-
ness plus 3
threads|24|2.85|DR|DR|DR|2.20|DR|DR|DR| |Minimum 33
mil steel
furring or
minimum
1x wood
furringc|43 mil or
thicker cold-
formed steel
stud|#10 screw|Steel thick-
ness plus 3
threads|12|4.00|3.85|2.80|1.80|4.00|3.05|1.50|DR| |Minimum 33
mil steel
furring or
minimum
1x wood
furringc|43 mil or
thicker cold-
formed steel
stud|#10 screw|Steel thick-
ness plus 3
threads|16|4.00|3.30|1.95|0.60|4.00|2.25|DR|DR| |Minimum 33
mil steel
furring or
minimum
1x wood
furringc|43 mil or
thicker cold-
formed steel
stud|#10 screw|Steel thick-
ness plus 3
threads|24|4.00|2.25|DR|DR|4.00|0.65|DR|DR| |For SI: 1 inch = 25.4 mm, 1 pound per square foot (psf) = 0.0479 kPa, 1 pound per square inch = 0.00689 MPa.
DR = Design Required, o.c. = on center.
a. Wood furring shall be spruce-pine-fir or any softwood species with a specific gravity of 0.42 or greater.

CRC § 1701.1 Medium relevance — show source text

TABLE 1701.1 (continued) REFERENCED STANDARDS

STANDARD NUMBER	STANDARD TITLE	APPLICATION	REFERENCED SECTION
ASTM D3261-2016	Standard Specification for Butt Heat Fusion Polyethylene (PE) Plastic Fittings for Polyethylene (PE) Plastic Pipe and Tubing	Fittings	Table 604.1
ASTM D4068-2017	Standard Specification for Chlorinated Polyethylene (CPE) Sheeting for Concealed Water-Containment Membrane	Miscellaneous	408.8.2
ASTM D4551-2017	Standard Specification for Poly (Vinyl Chloride) (PVC) Plastic Flexible Concealed Water-Containment Membrane	Miscellaneous	408.8.1
ASTM D6104-1997 (R2017)e1	Standard Practice for Determining the Performance of Oil/Water Separators Subjected to Surface Run-Off	Interceptors	Table 1009.1
ASTM E84-2021a	Standard Test Method for Surface Burning Characteristics of Building Materials	Miscellaneous	701.2(2), 903.1(2), 1101.4
ASTM E119-2020	Standard Test Methods for Fire Tests of Building Construction and Materials	Miscellaneous	1404.3, 1405.3
ASTM E814-2013a (R2017)	Standard Test Method for Fire Tests of Penetration Firestop Systems	Miscellaneous	1404.3, 1405.3
ASTM F409-2017	Standard Specification for Thermoplastic Accessible and Replaceable Plastic Tube and Tubular Fittings	Piping, Plastic	404.1
ASTM F437-2021	Standard Specification for Threaded Chlorinated Poly (Vinyl Chloride) (CPVC) Plastic Pipe Fittings, Schedule 80	Fittings	Table 604.1
ASTM F438-2017	Standard Specification for Socket-Type Chlorinated Poly (Vinyl Chloride) (CPVC) Plastic Pipe Fittings, Schedule 40	Fittings	Table 604.1
ASTM F439-2019	Standard Specification for Chlorinated Poly (Vinyl Chloride) (CPVC) Plastic Pipe Fittings, Schedule 80	Fittings	Table 604.1
ASTM F441/F441M-2020	Standard Specification for Chlorinated Poly (Vinyl Chloride) (CPVC) Plastic Pipe, Schedules 40 and 80	Piping	Table 604.1
ASTM F442/F442M-2020	Standard Specification for Chlorinated Poly (Vinyl Chloride) (CPVC) Plastic Pipe (SDR-PR)	Piping	Table 604.1, 605.2.2
ASTM F493-2020	Standard Specification for Solvent Cements for Chlorinated Poly (Vinyl Chloride) (CPVC) Plastic Pipe and Fittings	Joints	605.2.2, 605.3.1
ASTM F628-2012e3	Standard Specification for Acrylonitrile-Butadiene-Styrene (ABS) Schedule 40 Plastic Drain, Waste, and Vent Pipe with a Cellular Core	Piping	Table 701.2
ASTM F656-2021	Standard Specification for Primers for Use in Solvent Cement Joints of Poly (Vinyl Chloride) (PVC) Plastic Pipe and Fittings	Joints	605.2.

CRC § 1101.16 Medium relevance — show source text
1101.16 Leaders, Conductors, and

Connections . . . . . . . . . . . . . . . . .207

1102.0 Roof Drains . . . . . . . . . . . . . . . . . .207

1102.1 Applications . . . . . . . . . . . . . . . . .207

1102.2 Dome Strainers Required . . . . . . .207

1102.3 Roof Drain Flashings . . . . . . . . . .207

1103.0 Size of Leaders, Conductors,

and Storm Drains . . . . . . . . . . . . .207

1103.1 Vertical Conductors and

Leaders . . . . . . . . . . . . . . . . . . . . .207

1103.2 Size of Horizontal Storm

Drains and Sewers . . . . . . . . . . . .207

1103.3 Size of Roof Gutters . . . . . . . . . . .207

1103.4 Side Walls Draining onto a Roof . . . . . . . . . . . . . . . . . .207

Table 1103.1 Sizing Roof Drains, Leaders, and Vertical Rainwater Piping . . .208

1104.0 Values for Continuous Flow . . . . .208

1104.1 General . . . . . . . . . . . . . . . . . . . . .208

1105.0 Controlled-Flow Roof

Drainage . . . . . . . . . . . . . . . . . . . .208

1105.1 Application . . . . . . . . . . . . . . . . . .208

Table 1105.1(1) Controlled-Flow Maximum Roof Water Depth . . . . . . . . . . . . .209

Table 1105.1(2) Distance of Scupper Bottoms Above Roof . . . . . . . . . . . . . . . . . .209

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TABLE OF CONTENTS

1105.2 Setback Roofs . . . . . . . . . . . . . . .209

1106.0 Engineered Storm Drainage System . . . . . . . . . . . . . . . . . . . . .209

1106.1 General . . . . . . . . . . . . . . . . . . . . .209

1106.2 Siphonic Roof Drainage Systems . . . . . . . . . . . . . . . . . . . .209

1106.3 Siphonic Roof Drains . . . . . . . . . .209

1107.0 Testing . . . . . . . . . . . . . . . . . . . . .209

1107.1 Testing Required . . . . . . . . . . . . .209

1107.2 Methods of Testing Storm Drainage Systems . . . . . . . . . . . .209

Table 1103.2 Sizing of Horizontal Rainwater Piping . . . . . . . . . . . . .210

Table 1103.3 Size of Gutters . . . . . . . . . . . . . . .211
CRC § 1101.1 Medium relevance — show source text
1101.1 Applicability . . . . . . . . . . . . . . . . . .205

1101.2 Where Required . . . . . . . . . . . . . .205

1101.3 Storm Water Drainage to Sanitary Sewer Prohibited . . . . . .205

1101.4 Material Uses . . . . . . . . . . . . . . . .205

Table 1101.4.6 Materials for Subsoil Drainpipe and Fittings . . . . . . . . . . . . . . . . . .205

1101.5 Expansion Joints Required . . . . . .205

1101.6 Subsoil Drains . . . . . . . . . . . . . . .205

1101.7 Building Subdrains . . . . . . . . . . . .206

1101.8 Areaway Drains . . . . . . . . . . . . . .206

1101.9 Window Areaway Drains . . . . . . .206

1101.10 Filling Stations and Motor Vehicle Washing Establishments . . . . . . . . . . . . . . .206

1101.11 Paved Areas . . . . . . . . . . . . . . . . .206

1101.12 Roof Drainage . . . . . . . . . . . . . . .206

1101.13 Cleanouts . . . . . . . . . . . . . . . . . . .207

1101.14 Rainwater Sumps . . . . . . . . . . . . .207

1101.15 Traps on Storm Drains and Leaders . . . . . . . . . . . . . . . . . . . . .207

1101.16 Leaders, Conductors, and

Connections . . . . . . . . . . . . . . . . .207

1102.0 Roof Drains . . . . . . . . . . . . . . . . . .207

1102.1 Applications . . . . . . . . . . . . . . . . .207

1102.2 Dome Strainers Required . . . . . . .207

1102.3 Roof Drain Flashings . . . . . . . . . .207

1103.0 Size of Leaders, Conductors,

and Storm Drains . . . . . . . . . . . . .207

1103.1 Vertical Conductors and

Leaders . . . . . . . . . . . . . . . . . . . . .207

1103.2 Size of Horizontal Storm

Drains and Sewers . . . . . . . . . . . .207

1103.3 Size of Roof Gutters . . . . . . . . . . .207

1103.4 Side Walls Draining onto a Roof . . . . . . . . . . . . . . . . . .207

Table 1103.1 Sizing Roof Drains, Leaders, and Vertical Rainwater Piping . . .208

1104.0 Values for Continuous Flow . . . . .208

1104.1 General . . . . . . . . . . . . . . . . . . . . .208

1105.0 Controlled-Flow Roof

Drainage . . . . . . . . . . . . . . . . . . . .208
CRC § 714.2 Medium relevance — show source text
714.2 Prohibited Water Discharge. No rain, surface, or subsurface water shall be connected to or discharged into a drainage system unless first approved by the Authority Having Jurisdiction.

714.3 Prohibited Sewer Connection. No cesspool, septic tank, seepage pit, or drain field shall be connected to a public sewer or to a building sewer leading to such public

sewer.

714.4 Commercial Food Waste Disposer. The Authority Having Jurisdiction shall review before approval, the installation of a commercial food waste disposer connecting to a private sewage disposal system.

714.5 Tanks. An approved type, watertight sewage or wastewater holding tank, the contents of which, due to their character, shall be periodically removed and disposed of at some approved off-site location, shall be installed where required by the Authority Having Jurisdiction or the Health Officer to prevent anticipated surface or subsurface contamination or pollution, damage to the public sewer, or other hazardous or nuisance conditions.

715.0 Building Sewer Materials.

715.1 Materials. The building sewer, beginning 2 feet (610 mm) from a building or structure, shall be of such materials as prescribed in this code.

715.2 Joining Methods and Materials. Joining methods and materials shall be as prescribed in this code.

715.3 Existing Sewers. Where permitted by the Authority Having Jurisdiction, trenchless methods of rehabilitation of existing building sewer and building storm sewers shall be installed in accordance with Section 715.3.1 or Section 715.3.2.

715.3.1 Sewer Pipe Lining. For trenchless installation of resin-impregnated flexible tubing to line existing building sewers and building storm sewers installation shall be in accordance with ASTM F1216, ASTM F2561, ASTM F2599, or ASTM F3240.

715.3.2 Sewer Pipe Replacement. For trenchless installation of polyethylene (PE) pipe using the pipe bursting method to replace existing building sewers and building storm sewers materials shall be in accordance with ASTM F714.

716.0 Markings.

716.1 General. Pipe, brick, block, prefabricated septic tanks, prefabricated septic tank or seepage pit covers, or other parts or appurtenances incidental to the installation of building sewers or private sewage disposal systems shall be in accordance with the approval requirements of Chapter 3 of this code.

717.0 Size of Building Sewers. 717.1 General. The minimum size of a building sewer shall be determined on the basis of the total number of fixture units drained by such sewer, in accordance with Table 717.1. No building sewer shall be smaller than the building drain.

For alternate methods of sizing building sewers, see Appendix C.

TABLE 717.1

MAXIMUM/MINIMUM FIXTURE UNIT LOADING
CRC § 717.1 Medium relevance — show source text
TABLE 717.1

MAXIMUM/MINIMUM FIXTURE UNIT LOADING

For SI units: 1 inch = 25 mm, 1 inch per foot = 83.3 mm/m
- See also Appendix H, Private Sewage Disposal Systems. For alternate methods of sizing drainage piping, see Appendix C.
176 2025 CALIFORNIA PLUMBING CODE

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SANITARY DRAINAGE

719.0 Cleanouts.

719.1 Locations. Cleanouts shall be placed inside the building near the connection between the building drain and the building sewer or installed outside the building at the lower end of the building drain and extended to grade.

Additional building sewer cleanouts shall be installed at intervals not to exceed 100 feet (30 480 mm) in straight runs and for each aggregate horizontal change in direction exceeding 135 degrees (2.36 rad). 719.2 No Additional Cleanouts. Where a building sewer or a branch thereof does not exceed 10 feet (3048 mm) in length and is a straight-line projection from a building drain that is provided with a cleanout, no cleanout will be required at its point of connection to the building drain. 719.3 Building Sewer Cleanouts. Required building sewer cleanouts shall be extended to grade and shall be in accordance with the appropriate sections of cleanouts, Section 707.0, for sizing, construction, and materials. Where building sewers are located under buildings, the cleanout requirements of Section 707.0 shall apply. 719.4 Cleaning. Each cleanout shall be installed so that it opens to allow cleaning in the direction of flow of the soil or waste or at right angles thereto and, except in the case of wye branch and end-of-line cleanouts, shall be installed vertically above the flow line of the pipe. 719.5 Access. Cleanouts installed under concrete or asphalt paving shall be made accessible by yard boxes or by extending flush with paving with approved materials and shall be adequately protected. 719.6 Manholes. Approved manholes shall be permitted to be installed in lieu of cleanouts, where first approved by the Authority Having Jurisdiction. The maximum distance between manholes shall not exceed 300 feet (91 440 mm).

The inlet and outlet connections shall be made by the use of a flexible compression joint not less than 12 inches (305 mm) and not exceeding 3 feet (914 mm) from the manhole. No flexible compression joints shall be embedded in the manhole base.

720.0 Sewer and Water Pipes. 720.1 General. Building sewers or drainage piping of clay or materials that are not approved for use within a building shall not be run or laid in the same trench as the water pipes unless the following requirements are met:

(1) The bottom of the water pipe, at points, shall be not less than 12 inches (305 mm) above the top of the sewer or drain line.

(2) The water pipe shall be placed on a solid shelf excavated at one side of the common trench with a clear horizontal distance of not less than 12 inches (305 mm) from the sewer or drain line.

(3) Water pipes crossing sewer or drainage piping constructed of clay or materials that are not approved for use within a building shall be laid not less than 12 inches (305 mm) above the sewer or drainpipe.
CRC § 707.2 Medium relevance — show source text
Table 707.2 Cleanout Materials for Drain, Waste, and Vent . . . . . . . . . . . . . .172

707.3 Watertight and Gastight . . . . . . . .172

707.4 Location . . . . . . . . . . . . . . . . . . . .172

707.5 Cleaning . . . . . . . . . . . . . . . . . . . .173

707.6 Extension . . . . . . . . . . . . . . . . . . .173

707.7 Interceptor . . . . . . . . . . . . . . . . . .173

707.8 Access . . . . . . . . . . . . . . . . . . . . .173

707.9 Clearance . . . . . . . . . . . . . . . . . . .173

707.10 Fittings . . . . . . . . . . . . . . . . . . . . .173

707.11 Pressure Drainage Systems . . . . .173

707.12 Countersunk Cleanout Plugs . . . .173

707.13 Hubless Blind Plugs . . . . . . . . . . .173

707.14 Trap Arms . . . . . . . . . . . . . . . . . . .173

708.0 Grade of Horizontal Drainage Piping . . . . . . . . . . . . . . . . . . . . . .173

708.1 General . . . . . . . . . . . . . . . . . . . . .173

709.0 Gravity Drainage Required . . . . . .173

709.1 General . . . . . . . . . . . . . . . . . . . . .173

710.0 Drainage of Fixtures Located Below the Next Upstream Manhole or Below the Main

Sewer Level . . . . . . . . . . . . . . . . .173

710.1 Backflow Protection . . . . . . . . . . .173

710.2 Sewage Discharge . . . . . . . . . . . .173

710.3 Sewage Ejector and Pumps . . . . .173

710.4 Discharge Line . . . . . . . . . . . . . . .174

710.5 Size of Building Drains and Sewers . . . . . . . . . . . . . . . . . . . . .174

710.6 Backwater Valves . . . . . . . . . . . . .174

710.7 Drainage and Venting Systems . . .174

710.8 Sump and Receiving Tank Construction . . . . . . . . . . . . . . . . .174

710.9 Alarm . . . . . . . . . . . . . . . . . . . . . .174

710.10 Sump and Receiving Tank Covers and Vents . . . . . . . . . . . . .174

710.11 Air Tanks . . . . . . . . . . . . . . . . . . .174

710.12 Grinder Pump Ejector . . . . . . . . . .174

710.13 Macerating Toilet Systems and Pumped Waste Systems . . . .174

711.0 Suds Relief . . . . . . . . . . . . . . . . . .175
CRC § 1101.4.1 Medium relevance — show source text
Mounting methods, supports and sample sizes of materials for testing that are not specified in ASTM E84 or UL 723 shall be prohibited.

[HCD 1 & HCD 2] ABS or PVC installations are limited to not more than two stories of areas of residential accommo- dation.

[OSHPD 1, 2, 3, 4 & 5] ABS and PVC installations are not allowed.

1101.4.1 Copper and Copper Alloys. Joints and connections in copper and copper alloy pipe and tube shall be installed in accordance with Section 705.3.

1101.4.2 Conductors. Conductors installed aboveground in buildings shall comply with the applicable standards referenced in Table 701.2 for aboveground drain, waste, and vent pipe. Conductors installed aboveground level shall be of seamless copper water tube, Type K, L, or M; Schedule 40 copper pipe or Schedule

40 copper alloy pipe; Type DWV copper drainage tube; service weight cast-iron soil pipe or hubless cast-iron soil pipe; standard weight galvanized steel pipe; stainless steel 304 or 316L [stainless steel 304 pipe and fittings shall not be installed underground and shall be kept not less than 6 inches (152 mm) aboveground], or Schedule 40 ABS or Schedule 40 PVC plastic pipe. 1101.4.2.1 [HCD 1] ABS or PVC installations are limited to not more than two stories of areas of res- idential accommodation.

1101.4.2.2 [OSHPD 1, 2, 3, 4 & 5] ABS and PVC installations are not allowed.

1101.4.3 Leaders. Leaders installed outside shall comply with the applicable standards referenced in Table 701.2 for aboveground drain, waste, and vent pipe; aluminum sheet metal; galvanized steel sheet metal; or copper sheet metal. 1101.4.4 Underground Building Storm Drains. Underground building storm drains shall comply with the applicable standards referenced in Table 701.2 for underground drain, waste, and vent pipe. 1101.4.5 Building Storm Sewers. Building storm sewers shall comply with the applicable standards referenced in Table 701.2 for building sewer pipe. 1101.4.6 Subsoil Drains. Subsoil drains shall be open jointed, perforated, or both and constructed of materials in conformance with Table 1101.4.6.

TABLE 1101.4.6

MATERIALS FOR SUBSOIL DRAINPIPE AND FITTINGS

MATERIAL REFERENCED STANDARD(S)

PE ASTM F667

PVC ASTM D2729

Vitrified Clay (Extra strength) ASTM C4, ASTM C700

1101.5 Expansion Joints Required. Expansion joints or sleeves shall be provided where warranted by temperature variations or physical conditions. 1101.6 Subsoil Drains. Subsoil drains shall be provided around the perimeter of buildings having basements, cellars, crawl spaces, or floors below grade.
CRC § 1101.4.2.2 Medium relevance — show source text
1101.4.2.2 [OSHPD 1, 2, 3, 4 & 5] ABS and PVC installations are not allowed.

1101.4.3 Leaders. Leaders installed outside shall comply with the applicable standards referenced in Table 701.2 for aboveground drain, waste, and vent pipe; aluminum sheet metal; galvanized steel sheet metal; or copper sheet metal. 1101.4.4 Underground Building Storm Drains. Underground building storm drains shall comply with the applicable standards referenced in Table 701.2 for underground drain, waste, and vent pipe. 1101.4.5 Building Storm Sewers. Building storm sewers shall comply with the applicable standards referenced in Table 701.2 for building sewer pipe. 1101.4.6 Subsoil Drains. Subsoil drains shall be open jointed, perforated, or both and constructed of materials in conformance with Table 1101.4.6.

TABLE 1101.4.6

MATERIALS FOR SUBSOIL DRAINPIPE AND FITTINGS

MATERIAL REFERENCED STANDARD(S)

PE ASTM F667

PVC ASTM D2729

Vitrified Clay (Extra strength) ASTM C4, ASTM C700

1101.5 Expansion Joints Required. Expansion joints or sleeves shall be provided where warranted by temperature variations or physical conditions. 1101.6 Subsoil Drains. Subsoil drains shall be provided around the perimeter of buildings having basements, cellars, crawl spaces, or floors below grade. Such subsoil drains shall be permitted to be positioned inside or outside of the footing, shall be of perforated or open-jointed approved drain tile or pipe, not less than 3 inches (80 mm) in diameter, and shall be laid in gravel, slag, crushed rock, approved [3] ⁄ 4 of an inch (19.1 mm) crushed, recycled glass aggregate, or other approved porous material with not less than 4 inches (102 mm) surrounding the pipe. Filter media shall be provided for exterior subsoil piping. Exception: [HCD 1 & HCD 2] Subsoil drains are mandatory only when required by the Authority Having Jurisdiction due to geological conditions.

TABLE 1101.4.6

MATERIALS FOR SUBSOIL DRAINPIPE AND FITTINGS

2025 CALIFORNIA PLUMBING CODE 205

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STORM DRAINAGE

1101.6.1 Discharge. Subsoil drains shall be piped to a storm drain, to an approved water course, to the front street curb or gutter, to an alley, or the discharge from the subsoil drains shall be conveyed to the alley by a concrete gutter. Where a continuously flowing spring or groundwater is encountered, subsoil drains shall be piped to a storm drain or an approved water course. 1101.6.2 Sump. Where it is not possible to convey the drainage by gravity, subsoil drains shall discharge to an accessible sump provided with an approved automatic electric pump.

MATERIAL	REFERENCED STANDARD(S)
PE	ASTM F667
PVC	ASTM D2729
Vitrified Clay (Extra strength)	ASTM C4, ASTM C700

MATERIAL	REFERENCED STANDARD(S)
PE	ASTM F667
PVC	ASTM D2729
Vitrified Clay (Extra strength)	ASTM C4, ASTM C700

CRC § 1.5 Medium relevance — show source text

; clips C, E; reinforcement: none;1/2″ plas-
ter, 1.5:2.5 mill mix.|N/A|55 min|||3|5, 8|3/4|

RESOURCE A-96 2025 CALIFORNIA EXISTING BUILDING CODE

on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

RESOURCE A—GUIDELINES ON FIRE RATINGS OF ARCHAIC MATERIALS AND ASSEMBLIES

TABLE 3.2—continued FLOOR/CEILING ASSEMBLIES—STEEL STRUCTURAL ELEMENTS	Col2	Col3	Col4	Col5	Col6	Col7	Col8	Col9	Col10
ITEM CODE	MEMBRANE THICKNESS	CONSTRUCTION DETAILS	PERFORMANCE	PERFORMANCE	REFERENCE NUMBER	REFERENCE NUMBER	REFERENCE NUMBER	NOTES	REC. HOURS
ITEM CODE	MEMBRANE THICKNESS	CONSTRUCTION DETAILS	LOAD	TIME	PRE-BMS-92	BMS-92	POST-BMS-92	POST-BMS-92	POST-BMS-92
F/C-S-8	1/2″	Spec. 9′ × 4′4″; S.J. 103 bar joists, 18″ o.c.; deck: 4 lbs rib lath base; 6″ × 6″ 10 × 10 gage reinforcement; 2″ deck 1:2:4 gravel concrete; membrane: furring,3/4″ C.R.S., 16″ o.c.; clips C, E; reinforcement: none;1/2″ plaster, 1.5:2.5 mill mix.	300 psf	1 hr 10 min			3	2, 3, 8	1
F/C-S-9	5/8″	10′ × 13′6″; S.J. 103, 24″ o.c.; deck: 2″ concrete, 1:2:4; membrane: furring 12″ o.c.; clips A, B, G; Extra “A” clips reinforcement;5/8″ plaster, 1.5:2, 1.5:3.	145 psf	3 hrs			3	6, 8	3
F/C-S-10	5/8″	18′ × 13′6″; joists, S.J. 103, 24″ o.c.; deck: 4 lbs rib lath; 6″ × 6″ 10 × 10 gage reinforcement; 2″ deck, 1:2:3.5 gravel concrete; membrane: furring, spacing 16″ o.c.

CRC § 714.3 Medium relevance — show source text
714.3 Prohibited Sewer Connection . . . .176

714.4 Commercial Food Waste

Disposer . . . . . . . . . . . . . . . . . . . .176

714.5 Tanks . . . . . . . . . . . . . . . . . . . . . .176

715.0 Building Sewer Materials . . . . . . .176

715.1 Materials . . . . . . . . . . . . . . . . . . . .176

715.2 Joining Methods and Materials . . .176

715.3 Existing Sewers . . . . . . . . . . . . . .176

716.0 Markings . . . . . . . . . . . . . . . . . . . .176

716.1 General . . . . . . . . . . . . . . . . . . . . .176

717.0 Size of Building Sewers . . . . . . . .176

717.1 General . . . . . . . . . . . . . . . . . . . . .176

Table 717.1 Maximum/Minimum Fixture

Unit Loading on Building Sewer Piping . . . . . . . . . . . . . . . .176

717.2 Meat and Poultry Processing Plants . . . . . . . . . . . . . . . . . . . . . .176

718.0 Grade, Support, and Protection of Building Sewers . . .176

718.1 Slope . . . . . . . . . . . . . . . . . . . . . .176

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TABLE OF CONTENTS

718.2 Support . . . . . . . . . . . . . . . . . . . . .176

718.3 Protection from Damage . . . . . . .176

719.0 Cleanouts . . . . . . . . . . . . . . . . . . .177

719.1 Locations . . . . . . . . . . . . . . . . . . .177

719.2 No Additional Cleanouts . . . . . . . .177

719.3 Building Sewer Cleanouts . . . . . .177

719.4 Cleaning . . . . . . . . . . . . . . . . . . . .177

719.5 Access . . . . . . . . . . . . . . . . . . . . .177

719.6 Manholes . . . . . . . . . . . . . . . . . . .177

720.0 Sewer and Water Pipes . . . . . . . .177

720.1 General . . . . . . . . . . . . . . . . . . . . .177

721.0 Location . . . . . . . . . . . . . . . . . . . .177

721.1 Building Sewer . . . . . . . . . . . . . . .177

Table 721.1 Minimum Horizontal Distance Required from Building Sewer . . . .177

721.2 Abutting Lot . . . . . . . . . . . . . . . . .177

722.0 Abandoned Sewers and Sewage Disposal Facilities . . . . . .177
CRC § 710.0 Medium relevance — show source text
710.0 Drainage of Fixtures Located Below the Next Upstream Manhole or Below the Main

Sewer Level . . . . . . . . . . . . . . . . .173

710.1 Backflow Protection . . . . . . . . . . .173

710.2 Sewage Discharge . . . . . . . . . . . .173

710.3 Sewage Ejector and Pumps . . . . .173

710.4 Discharge Line . . . . . . . . . . . . . . .174

710.5 Size of Building Drains and Sewers . . . . . . . . . . . . . . . . . . . . .174

710.6 Backwater Valves . . . . . . . . . . . . .174

710.7 Drainage and Venting Systems . . .174

710.8 Sump and Receiving Tank Construction . . . . . . . . . . . . . . . . .174

710.9 Alarm . . . . . . . . . . . . . . . . . . . . . .174

710.10 Sump and Receiving Tank Covers and Vents . . . . . . . . . . . . .174

710.11 Air Tanks . . . . . . . . . . . . . . . . . . .174

710.12 Grinder Pump Ejector . . . . . . . . . .174

710.13 Macerating Toilet Systems and Pumped Waste Systems . . . .174

711.0 Suds Relief . . . . . . . . . . . . . . . . . .175

711.1 General . . . . . . . . . . . . . . . . . . . . .175

712.0 Testing . . . . . . . . . . . . . . . . . . . . .175

712.1 Media . . . . . . . . . . . . . . . . . . . . . .175

712.2 Water Test . . . . . . . . . . . . . . . . . .175

712.3 Air Test . . . . . . . . . . . . . . . . . . . . .175

PART II Building Sewers . . . . . . . . . . . . .175

713.0 Sewer Required . . . . . . . . . . . . . .175

713.1 Where Required . . . . . . . . . . . . . .175

713.2 Private Sewage Disposal System . . . . . . . . . . . . . . . . . . . . .175

713.3 Public Sewer . . . . . . . . . . . . . . . . .175

713.4 Public Sewer Availability . . . . . . .175

713.5 Permit . . . . . . . . . . . . . . . . . . . . . .175

713.6 Lot . . . . . . . . . . . . . . . . . . . . . . . . .175

713.7 Installation . . . . . . . . . . . . . . . . . .175

714.0 Damage to Public Sewer or Private Sewage Disposal System . . . . . . . . . . . . . . . . . . . . .175

714.1 Unlawful Practices . . . . . . . . . . . .175
CRC § 713.6 Medium relevance — show source text
713.6 Lot. On every lot or premises hereafter connected to a public sewer, plumbing, and drainage systems or parts thereof on such lot or premises shall be connected with such public sewer.

713.7 Installation. In cities, counties, or both where the installation of building sewers is under the jurisdiction of a department other than the Authority Having Jurisdiction, the provisions of this code relating to building sewers need not apply.

Exception: Single-family dwellings and buildings or structures accessory thereto, existing and connected to an approved private sewage disposal system prior to the time of connecting the premises to the public sewer shall be permitted, where no hazard, nuisance, or insanitary condition is evidenced, and written permission has been obtained from the Authority Having Jurisdiction, remain connected to such properly maintained private sewage disposal system where there is insufficient grade or fall to permit drainage to the sewer by gravity.

714.0 Damage to Public Sewer or Private Sewage Disposal System.

714.1 Unlawful Practices. It shall be unlawful for a person to deposit, by means whatsoever, into a plumbing fixture, floor drain, interceptor, sump, receptor, or device which is

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connected to a drainage system, public sewer, private sewer, septic tank, or cesspool, ashes; cinders; solids; rags; flammable, poisonous, or explosive liquids or gases; oils; grease; and whatsoever that is capable of causing damage to the public sewer, private sewer, or private sewage disposal system.

714.2 Prohibited Water Discharge. No rain, surface, or subsurface water shall be connected to or discharged into a drainage system unless first approved by the Authority Having Jurisdiction.

714.3 Prohibited Sewer Connection. No cesspool, septic tank, seepage pit, or drain field shall be connected to a public sewer or to a building sewer leading to such public

sewer.

714.4 Commercial Food Waste Disposer. The Authority Having Jurisdiction shall review before approval, the installation of a commercial food waste disposer connecting to a private sewage disposal system.

714.5 Tanks. An approved type, watertight sewage or wastewater holding tank, the contents of which, due to their character, shall be periodically removed and disposed of at some approved off-site location, shall be installed where required by the Authority Having Jurisdiction or the Health Officer to prevent anticipated surface or subsurface contamination or pollution, damage to the public sewer, or other hazardous or nuisance conditions.

715.0 Building Sewer Materials.

715.1 Materials. The building sewer, beginning 2 feet (610 mm) from a building or structure, shall be of such materials as prescribed in this code.

715.2 Joining Methods and Materials. Joining methods and materials shall be as prescribed in this code.

715.3 Existing Sewers. Where permitted by the Authority Having Jurisdiction, trenchless methods of rehabilitation of existing building sewer and building storm sewers shall be installed in accordance with Section 715.3.1 or Section 715.3.2.
CRC § 707.12 High relevance — show source text
707.12 Countersunk Cleanout Plugs. Countersunk cleanout plugs shall be installed where raised heads cause a hazard.

707.13 Hubless Blind Plugs. Where a hubless blind plug is used for a required cleanout, the complete coupling and plug shall be accessible for removal or replacement. 707.14 Trap Arms. Cleanouts for trap arms shall be installed in accordance with Section 1002.3.

708.0 Grade of Horizontal Drainage Piping. 708.1 General. Building drain and other horizontal drainage piping shall be run in practical alignment and a uniform slope of not less than [1] ⁄ 4 inch per foot (20.8 mm/m) or 2 percent toward the point of disposal.

Where it is impractical due to the depth of the street sewer, structural features, or to the arrangement of a building or structure to obtain a slope of [1] ⁄ 4 inch per foot (20.8 mm/m) or 2 percent, building drain piping 4 inches (100 mm) or larger in diameter shall be permitted to have a slope of not less than [1] ⁄ 8 inch per foot (10.4 mm/m) or 1 percent, when first approved by the Authority Having Jurisdiction.

709.0 Gravity Drainage Required. 709.1 General. Where practicable, plumbing fixtures shall be drained to the public sewer or private sewage disposal system by gravity.

710.0 Drainage of Fixtures Located Below the Next Upstream Manhole or Below the Main Sewer Level.

710.1 Backflow Protection. Fixtures installed on a floor level that is lower than the next upstream manhole cover of the public, or private sewer shall be protected from backflow of sewage by installing an approved type of backwater valve. Fixtures on such floor level that are not below the next upstream manhole cover shall not be required to be protected by a backwater valve. Fixtures on floor levels above such elevation shall not discharge through the backwater valve. Cleanouts for drains that pass through a backwater valve shall be clearly identified with a permanent label stating “backwater valve downstream.”

710.2 Sewage Discharge. Drainage piping serving fixtures that are located below the crown level of the main sewer shall discharge into an approved watertight sump or receiving tank, so located as to receive the sewage or wastes by gravity. From such sump or receiving tank, the sewage or other liquid wastes shall be lifted and discharged into the building drain or building sewer by approved ejectors, pumps, or other equally efficient approved mechanical devices. 710.3 Sewage Ejector and Pumps. A sewage ejector or sewage pump receiving the discharge of water closets or urinals:

(1) Shall have a discharge capacity of not less than 20 gpm (1.26 L/s).

(2) In single dwelling units, the ejector or pump shall be capable of passing an 1 [1] ⁄ 2 inch (38 mm) diameter solid ball, and the discharge piping of each ejector or pump

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shall have a backwater valve and gate valve, and be not less than 2 inches (50 mm) in diameter.
CRC § 707.6 Medium relevance — show source text
707.6 Extension. Each cleanout extension shall be considered as drainage piping and each 90 degree (1.57 rad) cleanout extension shall be extended from a wye-type fitting or other approved fitting of equivalent sweep.

707.7 Interceptor. Each cleanout for an interceptor shall be outside of such interceptor.

707.8 Access. Each cleanout, unless installed under an approved cover plate, shall be above grade, readily accessible, and so located as to serve the purpose for which it is intended. Cleanouts located under cover plates shall be so installed as to provide the clearances and accessibility required by this section.

707.9 Clearance. Each cleanout in piping 2 inches (50 mm) or less in size shall be so installed that there is a clearance of not less than 18 inches (457 mm) by 18 inches (457 mm) in front of the cleanout. Cleanouts in piping exceeding 2 inches (50 mm) shall have a clearance of not less than 24 inches (610 mm) by 24 inches (610 mm) in front of the cleanout. Cleanouts in under-floor piping shall be extended to or above the finished floor or shall be extended outside the building where there is less than 18 inches (457 mm) vertical overall, allowing for obstructions such as ducts, beams, and piping, and 30 inches of (762 mm) horizontal clearance from the means of access to such cleanout. No under-floor cleanout shall be located exceeding 5 feet (1524 mm) from an access door, trap door, or crawl hole.

707.10 Fittings. Cleanout fittings shall be not less in size than those given in Table 707.1. 707.11 Pressure Drainage Systems. Cleanouts shall be provided for pressure drainage systems as classified under Section 710.7.

707.12 Countersunk Cleanout Plugs. Countersunk cleanout plugs shall be installed where raised heads cause a hazard.

707.13 Hubless Blind Plugs. Where a hubless blind plug is used for a required cleanout, the complete coupling and plug shall be accessible for removal or replacement. 707.14 Trap Arms. Cleanouts for trap arms shall be installed in accordance with Section 1002.3.

708.0 Grade of Horizontal Drainage Piping. 708.1 General. Building drain and other horizontal drainage piping shall be run in practical alignment and a uniform slope of not less than [1] ⁄ 4 inch per foot (20.8 mm/m) or 2 percent toward the point of disposal.

Where it is impractical due to the depth of the street sewer, structural features, or to the arrangement of a building or structure to obtain a slope of [1] ⁄ 4 inch per foot (20.8 mm/m) or 2 percent, building drain piping 4 inches (100 mm) or larger in diameter shall be permitted to have a slope of not less than [1] ⁄ 8 inch per foot (10.4 mm/m) or 1 percent, when first approved by the Authority Having Jurisdiction.

709.0 Gravity Drainage Required. 709.1 General. Where practicable, plumbing fixtures shall be drained to the public sewer or private sewage disposal system by gravity.

710.0 Drainage of Fixtures Located Below the Next Upstream Manhole or Below the Main Sewer Level.

CRC § 0.06 Medium relevance — show source text

INTERMITTENT FLOW ONLY*

GPM	FIXTURE UNITS
Up to 71⁄2	Equals 1 Fixture Unit
Greater than 71⁄2 to 15	Equals 2 Fixture Units
Greater than 15 to 30	Equals 4 Fixture Units
Greater than 30 to 50	Equals 6 Fixture Units

For SI units: 1 gallon per minute = 0.06 L/s

Discharge capacity exceeding 50 gallons per minute (3.15 L/s) shall be determined by the Authority Having Jurisdiction.

702.3 Continuous Flow. For a continuous flow into a drainage system, such as from a pump, sump ejector, air conditioning equipment, or similar device, 2 fixture units shall be equal to each gallon per minute (gpm) (L/s) of flow.

703.0 Size of Drainage Piping. 703.1 Minimum Size. The minimum sizes of vertical, horizontal, or both drainage piping shall be determined from the total of fixture units connected thereto, and additionally, in the case of vertical drainage pipes, in accordance with their length.

703.2 Maximum Number of Fixture Units. Table 703.2

shows the maximum number of fixture units allowed on a vertical or horizontal drainage pipe, building drain, or building sewer of a given size; the maximum number of fixture units allowed on a branch interval of a given size; and the maximum length (in feet and meters) of a vertical drainage pipe of a given size. 703.3 Sizing per Appendix C. For alternate method of sizing drainage piping, see Appendix C.

704.0 Fixture Connections (Drainage). 704.1 Inlet Fittings. Drainage piping shall be provided with approved inlet fittings for fixture connections, correctly located according to the size and type of fixture proposed to be connected.

704.2 Single Vertical Drainage Pipe. Two fixtures set back-to-back, or side-by-side, within the distance allowed between a trap and its vent, shall be permitted to be served by a single vertical drainage pipe provided that each fixture wastes separately into an approved double-fixture fitting having inlet openings at the same level. 704.3 Commercial Sinks. Pot sinks, scullery sinks, dishwashing sinks, silverware sinks, and other similar fixtures shall be connected directly to the drainage system. A floor drain shall be provided adjacent to the fixture and shall be connected on the sewer side of the sink. No other drainage

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TABLE 703.2

MAXIMUM UNIT LOADING AND MAXIMUM LENGTH OF DRAINAGE AND VENT PIPING

SIZE OF PIPE (inches)	11⁄4	11⁄2	2	3	4	5	6	8	10	12
Maximum Units Drainage Piping1 Vertical Horizontal	1 1	22,

CRC § 1101.12.2.2 Medium relevance — show source text
1101.12.2.2 Secondary Roof Drain. Secondary roof drains shall be provided. The secondary roof drains shall be located not less than 2 inches (51 mm) above the roof surface. The maximum height of the roof drains shall be a height to prevent the depth of ponding water from exceeding that for which the roof was designed as determined by Section 1101.12.1. The secondary roof drains shall connect to a piping system in accordance with Section 1101.12.2.2.1 or Section 1101.12.2.2.2.

1101.12.2.2.1 Separate Piping System. The secondary roof drainage system shall be a

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separate system of piping, independent of the primary roof drainage system. The discharge shall be above grade, in a location observable by the building occupants or maintenance personnel. Secondary roof drain systems shall be sized in accordance with Section 1101.12.1

based on the rainfall rate for which the primary system is sized. 1101.12.2.2.2 Combined System. The secondary roof drains shall connect to the vertical piping of the primary storm drainage conductor downstream of the last horizontal offset located below the roof. The primary storm drainage system shall connect to the building storm water that connects to an underground public storm sewer. The combined secondary and primary roof drain systems shall be sized in accordance with Section 1103.0 based on double the rain fall rate for the local area.

1101.13 Cleanouts. Cleanouts for building storm drains shall comply with the requirements of Section 719.0 of this code.

1101.13.1 Rain Leaders and Conductors. Rain leaders and conductors connected to a building storm sewer shall have a cleanout installed at the base of the

leader or conductor before it connects to the horizontal

drain.

1101.14 Rainwater Sumps. Rainwater sumps serving “public use” occupancy buildings shall be provided with dual pumps arranged to function alternately in the case of overload or mechanical failure. Pumps rated 600 V or less shall comply with UL 778 and shall be installed in accordance with the manufacturer’s installation instructions.

1101.15 Traps on Storm Drains and Leaders. Leaders and storm drains, where connected to a combined sewer, shall be trapped. Floor and area drains connected to a storm drain shall be trapped.

Exception: Traps shall not be required where roof drains, rain leaders, and other inlets are at locations permitted under Section 906.0, Vent Termination.

1101.15.1 Where Not Required. No trap shall be required for leaders or conductors that are connected to a sewer carrying storm water exclusively. 1101.15.2 Trap Size. Traps, where installed for individual conductors, shall be the same size as the horizontal drain to which they are connected.

1101.15.3 Method of Installation of Combined Sewer. Individual storm-water traps shall be installed on the stormwater drain branch serving each storm-water inlet, or a single trap shall be installed in the main storm drain just before its connection with the combined building sewer. Such traps shall be provided with an accessible cleanout on the outlet side of the trap.
CRC § 1101.7 Medium relevance — show source text
(1) They do not serve continuously flowing springs or groundwater.

(2) The point of discharge is not less than 10 feet (3048 mm) from a property line.

(3) It is impracticable to discharge such drains to a storm drain, to an approved water course, to the front street curb or gutter, or to an alley. 1101.7 Building Subdrains. Building subdrains located below the public sewer level shall discharge into a sump or receiving tank, the contents of which shall be automatically lifted and discharged into the drainage system as required for building sumps. 1101.8 Areaway Drains. Open subsurface space adjacent to a building, serving as an entrance to the basement or cellar of a building, shall be provided with a drain or drains. The areaway drains shall be not less than 2 inches (50 mm) in diameter for areaways at a maximum of 100 square feet (9.29 m [2] ) in area, and shall be discharged in the manner provided for subsoil drains not serving continuously flowing springs or groundwater (see Section 1101.6.1). Areaways exceeding 100 square feet (9.29 m [2] ) shall not drain into subsoil drains.

The drains for areaways exceeding 100 square feet (9.29 m [2] ) shall be sized in accordance with Table 1103.2.

1101.9 Window Areaway Drains. Window areaways at a maximum of 10 square feet (0.93 m [2] ) in area shall be permitted to discharge to the subsoil drains through a 2 inch (50 mm) diameter pipe. However, window areaways exceeding 10 square feet (0.93 m [2] ) in area shall be handled in the manner provided for entrance areaways (see Section 1101.8). 1101.10 Filling Stations and Motor Vehicle Washing Establishments. Public filling stations and motor vehicle washing establishments shall have the paved area sloped toward sumps or gratings within the property lines. Curbs not less than 6 inches (152 mm) high shall be placed where required to direct water to gratings or sumps.

1101.11 Paved Areas. Where the occupant creates surface water drainage, the sumps, gratings, or floor drains shall be piped to a storm drain or an approved water course. 1101.12 Roof Drainage. Roof drainage shall comply with Section 1101.12.1 and Section 1101.12.2.

1101.12.1 Primary Roof Drainage. Roof areas of a building shall be drained by roof drains or gutters. The location and sizing of drains and gutters shall be coordinated with the structural design and pitch of the roof. Unless otherwise required by the Authority Having Jurisdiction, roof drains, gutters, vertical conductors or leaders, and horizontal storm drains for primary drainage shall be sized based on a storm of 60 minutes duration and 100 year return period. Refer to Table D 101.1 (in Appendix D) for 100 years, 60-minute storms at various locations. 1101.12.2 Secondary Drainage. Secondary (emergency) roof drainage shall be provided by one of the methods specified in Section 1101.12.2.1 or Section 1101.12.2.2.
CRC § 707.1 Medium relevance — show source text
TABLE 707.1

CLEANOUTS

For SI units: 1 inch = 25 mm

TABLE 707.2 CLEANOUT MATERIALS FOR DRAIN, WASTE, AND VENT

1 [HCD 1 & HCD 2] ABS and PVC installations are limited to not more

than two stories of areas of residential accommodation.

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Exceptions:

(1) Cleanouts shall be permitted to be omitted on a horizontal drain line less than 5 feet (1524 mm) in length unless such line is serving sinks or urinals.

(2) Cleanouts shall be permitted to be omitted on a horizontal drainage pipe installed on a slope of 72 degrees (1.26 rad) or less from the vertical angle (one-fifth bend).

(3) Excepting the building drain, its horizontal branches, kitchen sinks, and urinals, a cleanout shall not be required on a pipe or piping that is above the floor level of the lowest floor of the building.

(4) An approved type of two-way cleanout fitting, installed inside the building wall near the connection between the building drain and the building sewer or installed outside of a building at the lower end of a building drain and extended to grade, shall be permitted to be substituted for an upper terminal cleanout.

707.4.1 Load Rated Cover. Cleanout floor covers and top rims meant to take loads shall be rated for the loading in accordance with ASME A112.36.2M. 707.5 Cleaning. Each cleanout shall be installed so that it opens to allow cleaning in the direction of flow of the soil or waste or at right angles thereto and, except in the case of wye branch and end-of-line cleanouts, shall be installed vertically above the flow line of the pipe.

707.6 Extension. Each cleanout extension shall be considered as drainage piping and each 90 degree (1.57 rad) cleanout extension shall be extended from a wye-type fitting or other approved fitting of equivalent sweep.

707.7 Interceptor. Each cleanout for an interceptor shall be outside of such interceptor.

707.8 Access. Each cleanout, unless installed under an approved cover plate, shall be above grade, readily accessible, and so located as to serve the purpose for which it is intended. Cleanouts located under cover plates shall be so installed as to provide the clearances and accessibility required by this section.

707.9 Clearance. Each cleanout in piping 2 inches (50 mm) or less in size shall be so installed that there is a clearance of not less than 18 inches (457 mm) by 18 inches (457 mm) in front of the cleanout. Cleanouts in piping exceeding 2 inches (50 mm) shall have a clearance of not less than 24 inches (610 mm) by 24 inches (610 mm) in front of the cleanout. Cleanouts in under-floor piping shall be extended to or above the finished floor or shall be extended outside the building where there is less than 18 inches (457 mm) vertical overall, allowing for obstructions such as ducts, beams, and piping, and 30 inches of (762 mm) horizontal clearance from the means of access to such cleanout.
CRC § 1101.11 Medium relevance — show source text
1101.11 Paved Areas. Where the occupant creates surface water drainage, the sumps, gratings, or floor drains shall be piped to a storm drain or an approved water course. 1101.12 Roof Drainage. Roof drainage shall comply with Section 1101.12.1 and Section 1101.12.2.

1101.12.1 Primary Roof Drainage. Roof areas of a building shall be drained by roof drains or gutters. The location and sizing of drains and gutters shall be coordinated with the structural design and pitch of the roof. Unless otherwise required by the Authority Having Jurisdiction, roof drains, gutters, vertical conductors or leaders, and horizontal storm drains for primary drainage shall be sized based on a storm of 60 minutes duration and 100 year return period. Refer to Table D 101.1 (in Appendix D) for 100 years, 60-minute storms at various locations. 1101.12.2 Secondary Drainage. Secondary (emergency) roof drainage shall be provided by one of the methods specified in Section 1101.12.2.1 or Section 1101.12.2.2.

1101.12.2.1 Roof Scuppers or Open Side. Secondary roof drainage shall be provided by an opensided roof or scuppers where the roof perimeter construction extends above the roof in such a manner that water will be entrapped. An open-sided roof or scuppers shall be sized to prevent the depth of ponding water from exceeding that for which the roof was designed as determined by Section 1101.12.1. Scupper openings shall be not less than 4 inches (102 mm) high and have a width equal to the circumference of the roof drain required for the area served, sized in accordance with Table 1103.1.

1101.12.2.2 Secondary Roof Drain. Secondary roof drains shall be provided. The secondary roof drains shall be located not less than 2 inches (51 mm) above the roof surface. The maximum height of the roof drains shall be a height to prevent the depth of ponding water from exceeding that for which the roof was designed as determined by Section 1101.12.1. The secondary roof drains shall connect to a piping system in accordance with Section 1101.12.2.2.1 or Section 1101.12.2.2.2.

1101.12.2.2.1 Separate Piping System. The secondary roof drainage system shall be a

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separate system of piping, independent of the primary roof drainage system. The discharge shall be above grade, in a location observable by the building occupants or maintenance personnel. Secondary roof drain systems shall be sized in accordance with Section 1101.12.1

based on the rainfall rate for which the primary system is sized. 1101.12.2.2.2 Combined System. The secondary roof drains shall connect to the vertical piping of the primary storm drainage conductor downstream of the last horizontal offset located below the roof. The primary storm drainage system shall connect to the building storm water that connects to an underground public storm sewer. The combined secondary and primary roof drain systems shall be sized in accordance with Section 1103.0 based on double the rain fall rate for the local area.
CRC § 705.5 Medium relevance — show source text
705.5 Polyethylene (PE) Sewer Pipe . . .170

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TABLE OF CONTENTS

705.6 PVC and PVC Co-Extruded

Plastic Pipe and Joining Methods . . . . . . . . . . . . . . . . . . . .171

705.7 Stainless Steel Pipe and Joints . . .171

705.8 Vitrified Clay Pipe and Joints . . . .171

705.9 Special Joints . . . . . . . . . . . . . . . .171

705.10 Joints Between

Various Materials . . . . . . . . . . . . .171

706.0 Changes in Direction of Drainage Flow . . . . . . . . . . . . . . .172

706.1 Approved Fittings . . . . . . . . . . . . .172

706.2 Horizontal to Vertical . . . . . . . . . .172

706.3 Horizontal to Horizontal . . . . . . . .172

706.4 Vertical to Horizontal . . . . . . . . . .172

707.0 Cleanouts . . . . . . . . . . . . . . . . . . .172

707.1 Plug . . . . . . . . . . . . . . . . . . . . . . .172

Table 707.1 Cleanouts . . . . . . . . . . . . . . . . . . .172

707.2 Approved . . . . . . . . . . . . . . . . . . .172

Table 707.2 Cleanout Materials for Drain, Waste, and Vent . . . . . . . . . . . . . .172

707.3 Watertight and Gastight . . . . . . . .172

707.4 Location . . . . . . . . . . . . . . . . . . . .172

707.5 Cleaning . . . . . . . . . . . . . . . . . . . .173

707.6 Extension . . . . . . . . . . . . . . . . . . .173

707.7 Interceptor . . . . . . . . . . . . . . . . . .173

707.8 Access . . . . . . . . . . . . . . . . . . . . .173

707.9 Clearance . . . . . . . . . . . . . . . . . . .173

707.10 Fittings . . . . . . . . . . . . . . . . . . . . .173

707.11 Pressure Drainage Systems . . . . .173

707.12 Countersunk Cleanout Plugs . . . .173

707.13 Hubless Blind Plugs . . . . . . . . . . .173

707.14 Trap Arms . . . . . . . . . . . . . . . . . . .173

708.0 Grade of Horizontal Drainage Piping . . . . . . . . . . . . . . . . . . . . . .173

708.1 General . . . . . . . . . . . . . . . . . . . . .173

709.0 Gravity Drainage Required . . . . . .173
CRC § 1101.3 Medium relevance — show source text
1101.3 Storm Water Drainage to Sanitary Sewer Pro- hibited. Storm water shall not be drained into sewers intended for sanitary drainage. 1101.4 Material Uses. Pipe, tube, and fittings conveying rainwater shall be of such materials and design as to perform their intended function to the satisfaction of the Authority Having Jurisdiction. Conductors within a vent or shaft shall be of cast-iron, galvanized steel, wrought iron, copper, copper alloy, lead, Schedule 40 ABS DWV, Schedule 40 PVC DWV, stainless steel 304 or 316L [stainless steel 304 pipe and fittings shall not be installed underground and shall be kept not less than 6 inches (152 mm) aboveground], or other approved materials, and changes in direction shall be in accordance with the requirements of Section 706.0. ABS and PVC DWV piping installations shall be installed in accordance with applicable standards referenced in Chapter 17 and the firestop protection requirements in the California Building Code . Except for individual single-family dwelling units, materials exposed within ducts or plenums shall have a flame-spread index of not more than 25 and a smoke-developed index of not more than 50, where tested in accordance with ASTM E84 or UL 723. Plastic piping installed in plenums shall be tested in accordance with all requirements of ASTM E84 or UL 723. Mounting methods, supports and sample sizes of materials for testing that are not specified in ASTM E84 or UL 723 shall be prohibited.

[HCD 1 & HCD 2] ABS or PVC installations are limited to not more than two stories of areas of residential accommo- dation.

[OSHPD 1, 2, 3, 4 & 5] ABS and PVC installations are not allowed.

1101.4.1 Copper and Copper Alloys. Joints and connections in copper and copper alloy pipe and tube shall be installed in accordance with Section 705.3.

1101.4.2 Conductors. Conductors installed aboveground in buildings shall comply with the applicable standards referenced in Table 701.2 for aboveground drain, waste, and vent pipe. Conductors installed aboveground level shall be of seamless copper water tube, Type K, L, or M; Schedule 40 copper pipe or Schedule

40 copper alloy pipe; Type DWV copper drainage tube; service weight cast-iron soil pipe or hubless cast-iron soil pipe; standard weight galvanized steel pipe; stainless steel 304 or 316L [stainless steel 304 pipe and fittings shall not be installed underground and shall be kept not less than 6 inches (152 mm) aboveground], or Schedule 40 ABS or Schedule 40 PVC plastic pipe. 1101.4.2.1 [HCD 1] ABS or PVC installations are limited to not more than two stories of areas of res- idential accommodation.

1101.4.2.2 [OSHPD 1, 2, 3, 4 & 5] ABS and PVC installations are not allowed.
CRC § 604.1 Medium relevance — show source text
(19 mm)
through 3 in. (76 mm), for Water Service|Piping|Table 604.1| |AWWA C904-2016|Crosslinked Polyethylene (PEX) Pressure Tubing,1⁄2 in.
through 3 in. (13 mm through 76 mm), for Water Service|Piping|Table 604.1| |AWWA C907-2017|Injection-Molded Polyvinyl Chloride (PVC) Pressure Fittings,
4 in. through 12 in. (100 mm through 300 mm), for Water,
Wastewater, and Reclaimed Water Service|Fittings|Table 604.1| |CFR|CFR|CFR|CFR| |49 CFR 192.281|Plastic Pipe|Plastic, Pipe|1208.5.6.2| |49 CFR 192.283|Plastic Pipe: Qualifying Joining Procedures|Plastic, Pipe|1208.5.6.2| |CGA|CGA|CGA|CGA| |CGA G-4.1-2018|Cleaning of Equipment for Oxygen Service|Miscellaneous|1318.2, 1321.8.7| |CGA M-1-2018|Medical Gas Supply Systems at Health Care Facilities|Miscellaneous|1324.5.7.3| |CGA V-5-2019|Diameter Index Safety System (Noninterchangeable Low Pres-
sure Connections for Medical Gas Applications)|Connections|1315.5| |CISPI|CISPI|CISPI|CISPI| |CISPI 301-2021|Hubless Cast Iron Soil Pipe and Fittings for Sanitary and Storm
Drain, Waste, and Vent Piping Applications|Piping, Ferrous|301.2.4, Table 701.2,
Table 707.2| |CISPI 310-2020|Couplings for Use in Connection with Hubless Cast Iron Soil
Pipe and Fittings for Sanitary and Storm Drain, Waste, and
Vent Piping Applications|Joints|301.2.4, 705.2.2| |CSA|CSA|CSA|CSA| |ASME A112.19.2-
2018/CSA B45.1-2018|Ceramic Plumbing Fixtures|Fixtures|407.1, 408.1, 409.1,
410.1, 411.1, 412.1,
415.1, 420.1| |ASME A112.19.1-
2018/CSA B45.2-2018|Enameled Cast Iron and Enameled Steel Plumbing Fixtures|Fixtures|407.1, 408.1, 409.1,
415.1, 420.1| |ASME A112.19.3-
2017/CSA B45.4-2017|Stainless Steel Plumbing Fixtures|Fixtures|407.1, 408.1, 409.1,
410.1, 411.1, 415.1,
420.1| |CSA B45.5-2017/IAPMO
Z124-2017|Plastic Plumbing Fixtures (with Errata dated August 2017)|Fixtures|407.1, 408.1, 409.1,
CRC § 5A-3 Medium relevance — show source text
METHOD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5A-3

501A General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5A-3

502A Additions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5A-4

503A Alterations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5A-5

504A Reserved . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5A-7

505A Reserved. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5A-7

506A Change of Occupancy. . . . . . . . . . . . . . . . . . . . . . . . . . . .5A-7

CHAPTER 6 CLASSIFICATION OF WORK . . . . . . . . . . . . . . . 6-3

601 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

602 Alteration—Level 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

603 Alteration—Level 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

604 Alteration—Level 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

605 Change of Occupancy. . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

606 Additions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

607 Historic Buildings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

CHAPTER 7 ALTERATIONS—LEVEL 1 . . . . . . . . . . . . . . . . . .7-3

701 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3

702 Building Elements and Materials . . . . . . . . . . . . . . . . . 7-3
California Residential Code Medium relevance — show source text
700|0–12,700|0–8,200|0–5,900|0–3,600|1,500|2| |22,701–30,200|12,701–17,000|8,201–10,900|5,901–7,900|3,601–4,800|1,750|1,750| |30,201–38,700|17,001–21,800|10,901–12,900|7,901–9,800|4,801–6,200|2,000|2,000| |38,701–48,300|21,801–24,200|12,901–17,400|9,801–12,600|6,201–7,700|2,250|2,250| |48,301–59,000|24,201–33,200|17,401–21,300|12,601–15,400|7,701–9,400|2,500|2,500| |59,001–70,900|33,201–39,700|21,301–25,500|15,401–18,400|9,401–11,300|2,750|2,750| |70,901–83,700|39,701–47,100|25,501–30,100|18,401–21,800|11,301–13,400|3,000|3| |83,701–97,700|47,101–54,900|30,101–35,200|21,801–25,900|13,401–15,600|3,250|3,250| |97,701–112,700|54,901–63,400|35,201–40,600|25,901–29,300|15,601–18,000|3,500|3,500| |112,701–128,700|63,401–72,400|40,601–46,400|29,301–33,500|18,001–20,600|3,750|3,750| |128,701–145,900|72,401–82,100|46,401–52,500|33,501–37,900|20,601–23,300|4,000|4| |145,901–164,200|82,101–92,400|52,501–59,100|37,901–42,700|23,301–26,300|4,250|4,250| |164,201–183,400|92,401–103,100|59,101–66,000|42,701–47,700|26,301–29,300|4,500|4,500| |183,401–203,700|103,101–114,600|66,001–73,300|47,701–53,000|29,301–32,600|4,750|4,750| |203,701–225,200|114,601–126,700|73,301–81,100|53,001–58,600|32,601–36,000|5,000|5,000| |225,201–247,700|126,701–139,400|81,101–89,200|58,601–65,400|36,001–39,600|5,250|5,250| |247,701–271,200|139,401–152,600|89,201–97,700|65,401–70,600|39,

CRC § 705.10 Medium relevance — show source text

Waste,
and Vent (DWV), Sewer, Sanitary, and Storm Plumbing Sys-
tems for Above and Below Ground Use|Joints|705.10|

340 2025 CALIFORNIA PLUMBING CODE

REFERENCED STANDARDS

TABLE 1701.1 (continued) REFERENCED STANDARDS

STANDARD NUMBER	STANDARD TITLE	APPLICATION	REFERENCED SECTION
ASTM C1540-2020	Standard Specification for Heavy-Duty Shielded Couplings Joining Hubless Cast Iron Soil Pipe and Fittings	Joints	705.2.2
ASTM C1563-2008 (R2021)	Standard Test Method for Gaskets for Use in Connection with Hub and Spigot Cast Iron Soil Pipe and Fittings for Sanitary Drain, Waste, Vent, and Storm Piping Applications	Joints	705.2.2
ASTM C1822-2021	Standard Specification for Insulating Covers on Accessible Lavatory Piping	Miscellaneous	403.3
ASTM D1253-2014	Standard Test Method for Residual Chlorine in Water	Miscellaneous	1506.10.6, 1603.4.1
ASTM D1785-2021a	Standard Specification for Poly (Vinyl Chloride) (PVC) Plastic Pipe, Schedules 40, 80, and 120	Piping	Table 604.1, Table 701.2
ASTM D2235-2021	Standard Specification for Solvent Cement for Acrylonitrile- Butadiene-Styrene (ABS) Plastic Pipe and Fittings	Joints	705.1.2
ASTM D2239-2021	Standard Specification for Polyethylene (PE) Plastic Pipe (SIDR-PR) Based on Controlled Inside Diameter	Piping	Table 604.1
ASTM D2241-2020	Standard Specification for Poly (Vinyl Chloride) (PVC) Pressure- Rated Pipe (SDR Series)	Piping	Table 604.1
ASTM D2464-2015	Standard Specification for Threaded Poly (Vinyl Chloride) (PVC) Plastic Pipe Fittings, Schedule 80	Fittings	Table 604.1
ASTM D2466-2021	Standard Specification for Poly (Vinyl Chloride) (PVC) Plastic Pipe Fittings, Schedule 40	Fittings	Table 604.1
ASTM D2467-2020	Standard Specification for Poly (Vinyl Chloride) (PVC) Plastic Pipe Fittings, Schedule 80	Fittings	Table 604.1
ASTM D2513-2020	Standard Specification for Polyethylene (PE) Gas Pressure Pipe, Tubing, and Fittings	Piping	1208.5.4, 1208.5.6.2, 1208.5.10.2, 1210.1.7.1(1)
ASTM D2564-2020	Standard Specification for Solvent Cements for Poly (Vinyl Chloride) (PVC) Plastic Piping Systems	Joints	605.12.2, 705.6.

CRC § 1.4 Medium relevance — show source text

340 2025 CALIFORNIA PLUMBING CODE

REFERENCED STANDARDS

TABLE 1701.1 (continued) REFERENCED STANDARDS

STANDARD NUMBER	STANDARD TITLE	APPLICATION	REFERENCED SECTION
ASTM C1540-2020	Standard Specification for Heavy-Duty Shielded Couplings Joining Hubless Cast Iron Soil Pipe and Fittings	Joints	705.2.2
ASTM C1563-2008 (R2021)	Standard Test Method for Gaskets for Use in Connection with Hub and Spigot Cast Iron Soil Pipe and Fittings for Sanitary Drain, Waste, Vent, and Storm Piping Applications	Joints	705.2.2
ASTM C1822-2021	Standard Specification for Insulating Covers on Accessible Lavatory Piping	Miscellaneous	403.3
ASTM D1253-2014	Standard Test Method for Residual Chlorine in Water	Miscellaneous	1506.10.6, 1603.4.1
ASTM D1785-2021a	Standard Specification for Poly (Vinyl Chloride) (PVC) Plastic Pipe, Schedules 40, 80, and 120	Piping	Table 604.1, Table 701.

CRC § 6-3 Medium relevance — show source text
601 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

602 Alteration—Level 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

603 Alteration—Level 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

604 Alteration—Level 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

605 Change of Occupancy. . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

606 Additions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

607 Historic Buildings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

CHAPTER 7 ALTERATIONS—LEVEL 1 . . . . . . . . . . . . . . . . . .7-3

701 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3

702 Building Elements and Materials . . . . . . . . . . . . . . . . . 7-3

703 Fire Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4

704 Means of Egress . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4

705 Reroofing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4

706 Structural. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5

707 Reserved . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6

708 Energy Conservation. . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6

CHAPTER 8 ALTERATIONS—LEVEL 2 . . . . . . . . . . . . . . . . . .8-3

801 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3

802 Building Elements and Materials . . . . . . . . . . . . . . . . . 8-3
CRC § 4.6 Medium relevance — show source text
Considerations are soil density; clearance from obstacles, utilities, and structures; location of bends, and water service locations. Excavations and shoring shall be in accordance with jurisdictional safety requirements. (c) Set Up Fuse the proper length of polyethylene pipe in accordance with ASTM F2620, or ASTM D3261 and fuse the end to a small length that is attached to the pulling head. A rod pusher cable is pushed through the damaged host pipe and attached to the pulling cable, which is then drawn through the pipe. The clevis end of the cable is attached to the pulling head. The pulling equipment is then set up according to the manufacturer’s instructions.

(d) Pulling Pull the pulling head through. Once the pull is done, complete the connection to the existing piping.

4.6 Cleanouts

4.6.1 Plug Each cleanout fitting for cast-iron pipe shall consist of a cast-iron or brass body and an approved plug. Each cleanout for galvanized wrought-iron, galvanized steel, copper, or brass pipe shall consist of a brass plug as specified in Table 1, or a standard weight brass cap, or an approved ABS or PVC plastic plug, or an approved stainless-steel cleanout or plug. Plugs shall have raised square heads or approved countersunk rectangular slots. 4.6.2 Approved Each cleanout fitting and each cleanout plug, or cap shall be of an approved type.

452 2025 CALIFORNIA PLUMBING CODE

), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.

IS 26

4.6.3 Watertight and Gastight

Cleanouts shall be designed to be watertight and gastight.

5 Testing and Inspection Requirements

5.1 Media

The piping of the building sewer shall be tested with water. The Authority Having Jurisdiction shall be permitted to require the removal of cleanouts, etc., to ascertain whether the pressure has reached all parts of the system.

5.2 Water Test

The system shall be tested by plugging the end of the building sewer at its points of connection to the public sewer or private sewage disposal system and completely filling the building sewer with water from the lowest to the highest point thereof.

5.3 Inspections

The completed piping shall be internally inspected by camera unless waived by the Administrative Authority.

TABLE 1

CLEANOUTS (See Section 4.6.1)

NPS SIZE OF CLEANOUT
(inches) THREADS PER INCH

1.5 1.5 11.5

2 1.5 11.5

2.5 2.5 8

3 2.5 8

4 & larger 3.5 8

Note: For SI units: 1 inch = 25 mm

Uniform Plumbing Code References

The following sections of the 2024 Uniform Plumbing Code apply.

105.2 Required Inspections

105.2.2 Other Inspections

105.3 Testing of Systems

301.2 Minimum Standards

309.0 Workmanship

312.0 Protection of Piping, Materials, and Structures
CRC § 7000-2020 Medium relevance — show source text
3| |ASSE/IAPMO/ANSI Series
7000-2020|Residential Potable Water Fire Sprinkler System Installers &
Inspectors for One- and Two-Family Dwellings|Miscellaneous|612.1| |ASSE/IAPMO/ANSI
12010-2021|Environment of Care, Infection Control and Construction Risk
Assessment Professional Qualification Standard|Professional
Qualifications|1303.9| |ASSP|ASSP|ASSP|ASSP| |ASSP Z359.1-2020|The Fall Protection Code|Miscellaneous|508.2.1.1| |ASTM|ASTM|ASTM|ASTM| |ASTM A53/A53M-2020|Standard Specification for Pipe, Steel, Black and Hot-Dipped,
Zinc-Coated, Welded and Seamless|Piping|Table 604.1, Table
701.2, 1208.5.2.2(1)| |ASTM A74-2021|Standard Specification for Cast Iron Soil Pipe and Fittings|Piping|301.2.4, Table 701.2| |ASTM A106/A106M-2019a|Standard Specification for Seamless Carbon Steel Pipe for
High-Temperature Service|Piping|1208.5.2.2(2)| |ASTM A254/A254M-2012
(R2019)|Standard Specification for Copper-Brazed Steel Tubing|Piping|1208.5.3.1| |ASTM A268/A268M-2020|Standard Specification for Seamless and Welded Ferritic and
Martensitic Stainless Steel Tubing for General Service|Piping|1208.5.3.2(1)| |ASTM A269/A269M-2015a
(R2019)|Standard Specification for Seamless and Welded Austenitic
Stainless Steel Tubing for General Service|Piping|Table 604.1,
1208.5.3.2(2),
1319.1(2)(a)| |ASTM A312/A312M-2021|Standard Specification for Seamless, Welded, and Heavily
Cold Worked Austenitic Stainless Steel Pipes|Piping|Table 604.1,
1208.5.2.2(3),
1319.1(2)(b),
1319.1(2)(c)| |ASTM A403/A403M-2020|Standard Specification for Wrought Austenitic Stainless Steel
Piping Fittings|Fittings|1319.1(2)(c)| |ASTM A554-2021|Standard Specification for Welded Stainless Steel Mechanical
Tubing|Piping|Table 604.1| |ASTM A778-2016 (R2021)|Standard Specification for Welded, Unannealed Austenitic
Stainless Steel Tubular Products|Piping|Table 604.1| |ASTM A861-2004 (R2017)|Standard Specification for High-Silicon Iron Pipe and Fittings|Piping|811.2| |ASTM A888-2021a|Standard Specification for Hubless Cast Iron Soil Pipe and
Fittings for Sanitary and Storm Drain, Waste, and Vent Piping
Applications|Piping|301.2.4, Table 701.2,
Table 707.2|

2025 CALIFORNIA PLUMBING CODE 339
CRC § 3.1 Medium relevance — show source text
Exception: Construction documents for buildings constructed in accordance with the conventional light-frame construction provisions of Section 2308 shall indicate the following structural design information:
1. Floor and roof dead and live loads.
2. Ground snow load, p g, and allowable stress design ground snow load, p g(asd) .
3. Basic wind speed, V, mph (m/s), and allowable stress design wind speed, V asd , as determined in accordance with Section 1609 A .3.1 and wind exposure.
4. Seismic design category and site class.
5. Flood design data, if located in flood hazard areas established in Section 1612 A .3.
6. Design load-bearing values of soils.
7. Rain load data.
[DSA-SS] Additional requirements are included in Section 4-210 and 4-317 of the California Administrative Code (Part 1, Title 24, C.C.R).

[OSHPD 1] Additional requirements are included in Section 7-115 and 7-125 of the California Administrative Code.

1603 A .1.1 Floor live load. The uniformly distributed, concentrated and impact floor live load used in the design shall be indicated for floor areas. Use of live load reduction in accordance with Section 1607 A .13 shall be indicated for each type of live load used in the design.

1603 A .1.2 Roof live load. The roof live load used in the design shall be indicated for roof areas. 1603 A .1.3 Roof snow load data. The ground snow load, p g, shall be indicated. In areas where the ground snow load, p g , exceeds 15 pounds per square foot (psf) (0.72 kN/m [2] ), the following additional information shall also be provided, regardless of whether snow loads govern the design of the roof:
1. Flat-roof snow load, p f .
2. Snow exposure factor, C e .
3. Risk category.
4. Thermal factor, C t .
5. Slope factor(s), C s .
6. Drift surcharge load(s), p d , where the sum of p d and p f exceeds 30 psf (1.44 kN/m [2] ) .
7. Width of snow drift(s), w .
8. Winter wind parameter for snow drift, W 2 .
1603 A .1.4 Wind and tornado design data. The following information related to wind loads and, where required by Section 1609 A .5, tornado loads shall be shown, regardless of whether wind or tornado loads govern the design of the lateral force-resisting system of the structure:
1. Basic wind speed, V, mph (m/s), tornado speed, V T, mph (m/s), and allowable stress design wind speed, V asd, mph (m/s), as determined in accordance with Section 1609 A .3.1.

NPS	SIZE OF CLEANOUT (inches)	THREADS PER INCH
1.5	1.5	11.5
2	1.5	11.5
2.5	2.5	8
3	2.5	8
4 & larger	3.5	8

CRC § 10-17 Medium relevance — show source text

Col1	W	Col3	On Ea
Moisture Barrier, Open Top and Bottom dard Pull ction Service Entrance Point			Pr Ca
Moisture Barrier, Open Top and Bottom dard Pull ction Service Entrance Point
Moisture Barrier, Open Top and Bottom dard Pull ction Service Entrance Point
Moisture Barrier, Open Top and Bottom dard Pull ction Service Entrance Point
Moisture Barrier, Open Top and Bottom dard Pull ction Service Entrance Point
Moisture Barrier, Open Top and Bottom dard Pull ction Service Entrance Point	Load	Load
Moisture Barrier, Open Top and Bottom dard Pull ction Service Entrance Point	Load	Load

Termination of PG&E’s Service Cables	Col2	Col3	Col4

Front View (Back Entry)

Cable Terminating Facilities

Front View (Side Entry) or Side View (Back Entry)

Figure 10-17 Switchboard Pull Section–High Entry

Col1	Col2	Col4	Col5
Service Entrance Point tandard 90” Pull Section	Service Entrance Point tandard 90” Pull Section	Cable-Termina Facilities	Cable-Termina Facilities
Service Entrance Point tandard 90” Pull Section	Service Entrance Point tandard 90” Pull Section
Service Entrance Point tandard 90” Pull Section	Service Entrance Point ard 90” Section
Service Entrance Point tandard 90” Pull Section	Service Entrance Point ard 90” Section		2” ax
Service Entrance Point tandard 90” Pull Section	Service Entrance Point ard 90” Section

Front View (Side Entry) or Side View (Back Entry)

Figure 10-18 Switchboard Pull Section–Low Entry

2022 – 2023 10-30

Section 10, Electric Switchboards: 0 Volts Through 600 Volts

10.3.13. (continued)

Table 10-2 Pull-Section Dimensions (Minimums) Below Ground Level

CRC § 5.3.2 Medium relevance — show source text

2025 CALIFORNIA PLUMBING CODE 339

REFERENCED STANDARDS

TABLE 1701.1 (continued) REFERENCED STANDARDS

STANDARD NUMBER	STANDARD TITLE	APPLICATION	REFERENCED SECTION
ASTM A1056-2020	Standard Specification for Cast Iron Couplings used for Joining Hubless Cast Iron Soil Pipe and Fittings	Fittings	705.2.2
ASTM B32-2020	Standard Specification for Solder Metal	Joints	605.1.4, 705.3.3
ASTM B42-2020	Standard Specification for Seamless Copper Pipe, Standard Sizes	Piping	Table 604.1
ASTM B43-2020	Standard Specification for Seamless Red Brass Pipe, Standard Sizes	Piping	Table 604.1, Table 701.2
ASTM B75/B75M-2020	Standard Specification for Seamless Copper Tube	Piping	Table 604.1, Table 701.2
ASTM B88-2020	Standard Specification for Seamless Copper Water Tube	Piping	Table 604.1, 604.4, 903.2.3, 1208.5.3.3, 1319.1(1)(a)
ASTM B135/B135M-2017	Standard Specification for Seamless Brass Tube	Piping	Table 604.1
ASTM B152/B152M-2019	Standard Specification for Copper Sheet, Strip, Plate, and Rolled Bar	Miscellaneous	408.8.

Frequently asked questions

What is the single fastest way to avoid sewer clog problems?

Keep the horizontal runs uniformly sloped at 1/4 in/ft and avoid sags or variable slope — this preserves self‑scouring velocity (see §708.1).

Can I run my building sewer at a lesser slope because the street sewer is deep?

You may request AHJ approval to reduce slope; for 4 in. and larger pipes the code allows 1/8 in/ft (with approval) when 1/4 in/ft is impractical — see §708.1.

Where does the “building sewer” material requirement begin?

The material requirement applies to the building sewer beginning 2 feet (610 mm) from the building; materials must be those prescribed in the code and applicable referenced standards — §715.1.

Do I have to use cast‑iron for underground sewers?

No — multiple materials are allowed (PVC, PE via trenchless replacement, vitrified clay, ductile iron, cast‑iron, etc.), but you must select materials listed in Table 701.2 and meet the applicable standards and local restrictions — §701.2 and §715.1.

How often do I need cleanouts on the building sewer?

Required building sewer cleanouts must be installed at intervals not to exceed 100 feet in straight runs and at specified direction changes; required cleanouts must be extended to grade — §719.1.

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