CPC · California Plumbing Code

Accepted Engineering Practice and material abbreviations (ABS, LP-Gas, etc.)

Q: Is ABS allowed for building sewers?

Yes — ABS (Schedule 40) is listed in the CPC materials table as permitted for underground drain, waste and vent and for building sewer when the product meets the referenced standards (see Table 701.2 and § 203.0 ). Verify the product meets the ASTM/ASME standards listed in the table.

Q: Where do I find the CPC definition of LP‑Gas?

The CPC cross‑references LIQUEFIED PETROLEUM GAS (LP‑GAS) in the index and points to the fuel‑gas related definitions and requirements (see the CPC index entry referencing § 214.0 ). For fuel piping and installation rules consult the gas chapters and referenced standards.

Q: If my jurisdiction asks for a stamped engineering report, what standard must that report use?

The code requires that alternates conform to Accepted Engineering Practice (i.e., recognized standards, tests, or principles accepted by the engineering profession). The local building department may specify the scope of the report or the tests required; the CPC allows the authority to require testing or a technical opinion prepared by an acceptable qualified person. See the alternate materials/designs procedure.

Q: You reference § 217.0 — can you quote it?

I located the CPC table of contents / index showing § 217.0 exists (Chapter 2 definitions, “P” section), but the retrieval did not include the full text of § 217.0 in the files I searched. Because the specific wording was not available I have not quoted or relied on it here.

Accepted Engineering Practice in the California Plumbing Code (see § 203.0) means using methods, tests and standards accepted by the engineering profession; abbreviations like **ABS** (Acrylonitrile‑butadiene‑styrene) are defined in Chapter 2 and the CPC materials tables (e.g., Table 701.2) show where those materials are permitted. If you propose an alternate material or a nonstandard installation you must demonstrate conformance with recognized standards or provide an engineer’s design or tests as required by the authority having jurisdiction; the specific P‑section definitions at **§ 217.0** were listed in the CPC index but the full text for that section was not retrieved in the files I searched.

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Last reviewed: July 6, 2026

What the code requires — 2–4 sentences

The California Plumbing Code treats Accepted Engineering Practice as work that conforms to technical or scientific‑based principles, tests, or standards accepted by the engineering profession — see § 203.0 for the definition. ABS (Acrylonitrile‑butadiene‑styrene) is defined in the same section as an accepted abbreviation; the CPC lists which materials are permitted for drains, waste and vent (for example, ABS Schedule 40) in the materials tables. These definitions are the baseline: when the code requires design or an alternate method to be “in accordance with accepted engineering practice,” the CPC expects compliance with recognized technical standards and professional practice (see § 203.0).

The single most important rule: if the code calls for something to be done “in accordance with accepted engineering practice,” it must follow standards, tests or principles that the engineering profession recognizes (see § 203.0).

Requirements in detail

1) Key definitions you must know (first mention bolded)

Accepted Engineering Practice — means work that conforms to technical/scientific principles, tests, or standards accepted by the engineering profession (§ 203.0).
ABS — the abbreviation ABS is defined as Acrylonitrile‑butadiene‑styrene in § 203.0; the CPC’s materials tables then show where ABS (Schedule 40) is permitted.
LP‑Gas (Liquid Petroleum Gas) — appears as LP‑GAS in the CPC cross‑references (see the CPC index entry referencing § 214.0), but the full definition and any related requirements are located at or referenced from that section in the code. The CPC index shows the entry for LP‑GAS at § 214.0.

Note: The CPC table of definitions and the materials tables work together — Chapter 2 supplies the defined terms; later tables and chapters show where those materials or abbreviations are permitted or controlled.

2) How “Accepted Engineering Practice” is used in the CPC

When the code requires engineered design beyond prescriptive limits (for example nonconforming framing, unusual soil conditions, unusual loads), the work must be designed in Accepted Engineering Practice; the code authorizes the building official to require stamped drawings or technical reports to demonstrate compliance. See the CPC definitions and the general alternate materials/designs provisions (see the Alternate Materials / Alternate Methods sections of the code for procedural requirements).

3) Where common material abbreviations appear and how to apply them

Decision-relevant dimensions and where to look in the code:

Abbreviation	Meaning (short)	Typical permitted uses (decision‑relevant)	Code Reference
ABS	Acrylonitrile‑butadiene‑styrene	Permitted for underground and aboveground drain, waste and vent (ABS Schedule 40), and building sewer per the CPC materials table (see materials table).	§ 203.0; see CPC Table (Materials for DWV) — Table 701.2.
LP‑GAS	Liquefied Petroleum Gas (abbrev.)	Referenced for fuel‑gas provisions; see fuel/gas piping and appliance chapters for allowable uses and limits.	Index reference to § 214.0 (LP‑GAS) — CPC cross‑references the term.
(term in P‑section) § 217.0	Section heading for definitions beginning with “P”	Contains definitions used elsewhere in the CPC (specific text for § 217.0 was not retrieved in our files; see note below).	§ 217.0 (present in table of contents / index).

Notes on the table:

The CPC’s Chapter 2 provides the authoritative definition of abbreviations; the materials tables and relevant chapters (e.g., plumbing materials, gas piping) show where those materials/abbreviations are permitted and what standards apply.

Exceptions & special cases

Alternate materials, methods or designs that are not specifically prescribed by the code may be approved as long as they meet the equivalency requirements and are demonstrated to be at least equal in performance and safety; local building departments may require tests, technical reports, or that submittals be prepared by a licensed engineer (see the CPC alternate materials/alternate methods provisions). The CPC sets procedural requirements for approval of alternates — the local authority can require evidence or testing.
Where the code explicitly calls out a product listing or referenced standard for a material (for example, ASTM or ASME standards listed alongside ABS in materials tables), installation must follow the listing and manufacturer’s instructions as applicable. See Table 701.2 and its referenced standards for each material.
If your planned use is outside the prescriptive allowances (for example an unusual fuel gas arrangement or nonstandard material in a sewer within 2 feet of a building), expect to show engineering justification in accordance with Accepted Engineering Practice (see § 203.0).

Important: the full text of § 217.0 (the P‑section of Chapter 2) was not available in the retrieved files I searched, so I cannot quote or ground requirements from § 217.0 directly here. The CPC table of contents / index shows § 217.0 exists in Chapter 2, but the specific definitions under that section were not present in the retrieved preview. For that reason I have not attempted to assert the text of § 217.0.

Common mistakes

Treating a manufacturer’s installation sheet alone as “Accepted Engineering Practice.” Manufacturer instructions can be part of demonstrating accepted practice, but the CPC’s definition requires conformity to principles, tests or standards accepted by the engineering profession — not simply a single product sheet. Always align with recognized standards and, where needed, a licensed engineer’s evaluation. (§ 203.0)
Overlooking referenced standards in the materials table. For example, ABS shown in the materials table lists the ASTM/ASME standards that must be met; installing ABS that doesn’t meet those standards is a common code violation. See Table 701.2 for the materials/standards matrix.
Assuming an abbreviation in text (e.g., “LP‑Gas”) is informal. Abbreviations in Chapter 2 are defined terms; locate the definition in Chapter 2 before applying it elsewhere in the code. For LP‑GAS the CPC cross‑references § 214.0.
Relying on an authority’s informal guidance instead of documented technical evidence when the local official requests proof that an alternate conforms to accepted engineering practice — the code permits the authority to require tests or engineering reports.

Worked example — Concrete scenario applying the rule with numbers

Scenario: replace 50 ft of building sewer that currently is broken. The contractor proposes to install ABS (Schedule 40) SDR pipe for the building sewer.

Steps and how the CPC applies:

Confirm the abbreviation and material: ABS is defined as Acrylonitrile‑butadiene‑styrene in § 203.0. That tells you what “ABS” means when you see it in the materials table.
Check where ABS is permitted: the CPC Table 701.2 lists ABS (Schedule 40) as permitted for underground drain, waste and vent and building sewer and shows the applicable referenced standards (for example ASTM D2661, ASTM D2680 for ABS). If your proposed ABS Schedule 40 product meets those referenced standards, the material is permitted for the application.
- So for 50 ft of building sewer, ABS Schedule 40 is allowed if the pipe and fittings are listed to the referenced ASTM standards and installed per the manufacturer and applicable CPC provisions.
If the installation departs from typical details (e.g., connection to a nondomestic interceptor, unusual subgrade conditions, or local amendment), the building official may require an engineered solution or test demonstrating equivalence — i.e., the work must comply with Accepted Engineering Practice as defined in § 203.0. If a licensed engineer stamps the design showing the product and joints satisfy recognized standards, that satisfies the requirement for engineering documentation.

Numbers/checklist:

Length: 50 ft building sewer (project scope).
Material: ABS Schedule 40, listed to ASTM D2661 / ASTM D2680 (per Table 701.2).
Verification required: product certification to the ASTM standard, correct slope and bedding per CPC installation requirements, and any local jurisdiction required test/inspection. If unusual conditions exist, submit design stamped by a California‑licensed engineer in accordance with Accepted Engineering Practice (§ 203.0).

Related provisions (quick reference)

§ 203.0 — Definitions: ABS, Accepted Engineering Practice, etc.
§ 701.2 (Table 701.2) — Materials permitted for drain, waste and vent (shows ABS and referenced standards).
§ 1.8.7 — Alternate materials, designs, tests and methods — procedure and evidence required to approve alternates (shows when the authority can require tests, reports, or engineering).
§ 1208.5 — (Gas piping) Acceptable piping materials and joining methods — consult for fuel gas piping materials (see gas chapters for LP‑GAS connections).
§ 214.0 — CPC cross‑reference/index entry for LIQUEFIED PETROLEUM GAS (LP‑GAS) (see fuel gas chapters for full details).
§ 217.0 — Definitions in the “P” section of Chapter 2 (the specific text for § 217.0 was not retrieved in the files available to me; the Table of Contents / index shows the section exists).

Code references

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

CPC § 1.11.0. High relevance — show source text
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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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CHAPTER 2

DEFINITIONS

201.0 General.

201.1 Applicability. For the purpose of this code, the following terms have the meanings indicated in this chapter.

No attempt is made to define ordinary words, which are used in accordance with their established dictionary meanings, except where a word has been used loosely, and it is necessary to define its meaning as used in this code to avoid misunderstanding.

202.0 Definition of Terms.

202.1 General. The definitions of terms are arranged alphabetically according to the first word of the term.

203.0 – A –

ABS. Acrylonitrile-butadiene-styrene. Accepted Engineering Practice. That which conforms to technical or scientific-based principles, tests, or standards that are accepted by the engineering profession. Accessible. Where applied to a fixture, connection, appliance, or equipment, “accessible” means having access thereto, but which first may require the removal of an access panel, door, or similar obstruction. Accessible, Readily. Having a direct access without the necessity of removing a panel, door, or similar obstruction. Accessory Dwelling Unit. [HCD 1 & HCD 2] An attached or detached residential dwelling unit that provides complete independent living facilities for one or more per- sons and is located on a lot with a proposed or existing pri- mary residence. Accessory dwelling units shall include permanent provisions for living, sleeping, eating, cooking, and sanitation on the same parcel as the single-family or mul- tifamily dwelling is or will be situated. (See Government Code Section 65852.2.) Air Break. A physical separation which may be a low inlet into the indirect waste receptor from the fixture, appliance, or device indirectly connected. Air Gap, Drainage. The unobstructed vertical distance through the free atmosphere between the lowest opening from a pipe, plumbing fixture, appliance, or appurtenance conveying waste to the flood-level rim of the receptor. Air Gap, Water Distribution. The unobstructed vertical distance through the free atmosphere between the lowest opening from a pipe or faucet conveying potable water to the flood-level rim of a tank, vat, or fixture.

Alternate Water Source. Nonpotable source of water that includes but not limited to gray water, on-site treated nonpotable water, on-site treated nonpotable gray water, rainwater, and reclaimed (recycled) water. Anchors. See Supports. Anodeless Riser. An assembly of steel-cased plastic pipe used to make the transition between plastic piping installed

underground and metallic piping installed aboveground.

[NFPA 54:3.3.3] **Appliance.

CPC § 0.453 High relevance — show source text

For SI units: 1 inch = 25 mm, 1 pound = 0.453 kg, 1 ounce = 0.02834 kg

TABLE 701.7

SOLDERING BUSHINGS

PIPE SIZE (inches)	MINIMUM WEIGHT EACH	Col3	PIPE SIZE (inches)	MINIMUM WEIGHT EACH	Col6
PIPE SIZE (inches)	pounds	ounces	ounces	pounds	ounces
11⁄4	0	6	21⁄2	1	6
11⁄2	0	8	3	2	0
2	0	14	4	3	8

For SI units: 1 inch = 25 mm, 1 pound = 0.453 kg, 1 ounce = 0.02834 kg

702.0 Fixture Unit Equivalents. 702.1 Trap Size. The unit equivalent of plumbing fixtures shown in Table 702.1 shall be based on the size of the trap

TABLE 701.6

CAULKING FERRULES

For SI units: 1 inch = 25 mm, 1 pound = 0.453 kg, 1 ounce = 0.02834 kg

TABLE 701.7

SOLDERING BUSHINGS

For SI units: 1 inch = 25 mm, 1 pound = 0.453 kg, 1 ounce = 0.02834 kg

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SANITARY DRAINAGE

TABLE 701.2 MATERIALS FOR DRAIN, WASTE, VENT PIPE AND FITTINGS

MATERIAL	UNDERGROUND DRAIN, WASTE, VENT PIPE AND FITTINGS	ABOVEGROUND DRAIN, WASTE, VENT PIPE AND FITTINGS	BUILDING SEWER PIPE AND FITTINGS	REFERENCED STAN- DARD(S) PIPE	REFERENCED STANDARD(S) FITTINGS
ABS (Schedule 40)	X	X	X	ASTM D2661, ASTM D2680*	ASME A112.4.4, ASTM D2661, ASTM D2680*
Cast-Iron	X	X	X	ASTM A74, ASTM A888, CISPI 301	ASME B16.12, ASTM A74, ASTM A888, CISPI 301
Co-Extruded ABS (Schedule 40)	X	X	X	ASTM F628	ASME A112.4.4, ASTM D2661, ASTM D2680*
Co-Extruded Composite (Schedule 40)	X	X	X	ASTM F1488	ASME A112.4.4, ASTM D2661, ASTM D2665, ASTM F794*, ASTM F1866
Co-Extruded PVC (Schedule 40)	X	X	X	ASTM F891,

CPC § 211.0 High relevance — show source text
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225.0||X||X||||||X||X|X|X|X|||||||||| |Adopting Agency
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amended (amended
sections listed below)
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that are listed below
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225.0||||X||||||||||||||X||||||| |Adopting Agency
Adopt Entire Chapter
Adopt Entire Chapter as
amended (amended
sections listed below)
Adopt only those sections
that are listed below
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203.0
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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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30 2025 CALIFORNIA PLUMBING CODE

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CHAPTER 2

DEFINITIONS

201.0 General.

201.1 Applicability. For the purpose of this code, the following terms have the meanings indicated in this chapter.

No attempt is made to define ordinary words, which are used in accordance with their established dictionary meanings, except where a word has been used loosely, and it is necessary to define its meaning as used in this code to avoid misunderstanding.

202.0 Definition of Terms.

202.1 General. The definitions of terms are arranged alphabetically according to the first word of the term.

203.0 – A –

ABS. Acrylonitrile-butadiene-styrene. Accepted Engineering Practice. That which conforms to technical or scientific-based principles, tests, or standards that are accepted by the engineering profession. Accessible. Where applied to a fixture, connection, appliance, or equipment, “accessible” means having access thereto, but which first may require the removal of an access panel, door, or similar obstruction. **Accessible, Readily.
CPC § 4.1 Medium relevance — show source text
- 100°F
  (16°C-38°C)|1 h|6 h|2 h|12 h|6 h|24 h| |40°F-60°F
  (4°C-16°C)|2 h|12 h|4 h|24 h|12 h|48 h| |10°F- 40°F
  (-12°C+4°C)|8 h|48 h|16 h|96 h|48 h|8 days| |*If gaps or loose fits are encountered in the system, double these cure times.|*If gaps or loose fits are encountered in the system, double these cure times.|*If gaps or loose fits are encountered in the system, double these cure times.|*If gaps or loose fits are encountered in the system, double these cure times.|*If gaps or loose fits are encountered in the system, double these cure times.|*If gaps or loose fits are encountered in the system, double these cure times.|*If gaps or loose fits are encountered in the system, double these cure times.|
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IS 33

FIGURE 1

LOCATION OF THRUST BLOCKS (STANDARD AND METRIC COMBINED) A COMPARISON OF THRUST-BLOCK AREAS (See Section 4.1)

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IS 33

FIGURE 2

THRUST BLOCK BEARING AREA (See Section 5.2.2)

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IS 33

Uniform Plumbing Code References for Ductile Iron and PVC Pressure Building Supply and Exterior Cold-Water Piping

The following sections of the 2024 Uniform Plumbing Code apply to ductile iron and PVC pressure building supply and exterior cold-water piping.

Chapter 3 General Regulations

309.0 Workmanship

312.0 Protection of Piping, Materials, and Struc tures

313.0 Hangers, Supports, and Anchors

314.0 Trenching, Excavation, and Backfill

Chapter 6 Water Supply and Distribution

604.0 Materials (water piping)

Table 604.1 Materials for Building Supply and Water Distribution Piping and Fittings

605.4 Ductile Iron Pipe and Joints

605.12 PVC Plastic Pipe and Joints

605.16.2 Plastic Pipe to Other Materials

609.0 Installation, Testing, Unions, and Location

Abbreviations

IAPMO International Association of Plumbing and Mechanical Officials

UPC Uniform Plumbing Code published by IAPMO

AWWA American Water Works Association

CSA Canadian Standards Association

Applicable Standards.

ASME B16.4 Gray Iron Threaded Fittings Classes 125 and 250

ASTM D1785 Poly (Vinyl Chloride) (PVC) Plastic Pipe, Schedules 40, 80, and 120

ASTM D2241 Poly (Vinyl Chloride) (PVC) Pressure-Rated Pipe (SDR Series)

CPC § 3.1 Medium relevance — show source text

EXISTING 2x SILL PLATE. SEE FIGURES A304.3.1(1), A304.3.1(2), A304.3.1(3) OR A304.3.1(4) FOR

For SI: 1 inch = 25.4 mm.

NOTE: See Figure A304.3.1(1) for sill plate anchoring.

.1(3) FOR EXISTING 2 FIGURES A A304.3.1(3) NEW CONN	Col2	Col3
EXISTING 2 FIGURES A A304.3.1(3) NEW CONN .1(3) FOR
EXISTING 2 FIGURES A A304.3.1(3) NEW CONN .1(3) FOR
EXISTING 2 FIGURES A A304.3.1(3) NEW CONN .1(3) FOR
EXISTING 2 FIGURES A A304.3.1(3) NEW CONN .1(3) FOR
EXISTING 2 FIGURES A A304.3.1(3) NEW CONN .1(3) FOR
EXISTING 2 FIGURES A A304.3.1(3) NEW CONN .1(3) FOR

[BS] FIGURE A304.4.1(2)—CRIPPLE WALL BRACING WITH WOOD STRUCTURAL PANEL ON INTERIOR FACE OF CRIPPLE STUDS

THICK WOOD STRUCTURAL NEW 2x BLOCKING WITH 4-10d PANEL. SEE FIGURE A304.4.1(3) FOR NAILS EACH BLOCK TO SILL. PANEL AND NAILING LAYOUT PRE-DRILLED HOLES AS NEEDED

TO PRECLUDE SPLITTING

For SI: 1 inch = 25.4 mm.

Col1	Col2	Col3

2025 CALIFORNIA EXISTING BUILDING CODE APPENDIX A-39

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

APPENDIX A—GUIDELINES FOR THE SEISMIC RETROFIT OF EXISTING BUILDINGS

FIGURE A304.4.1(3) [BS] FIGURE A304.4.1(3)—PARTIAL CRIPPLE STUD WALL ELEVATION

2x BLOCKING FLAT ABOVE VENT OPENING.

2-IN.- TO 3-IN.-DIAMETER VENTILATION HOLES. SEE SECTION A304.4.3.

8d NAILS AT 4 IN. ON CENTER ON ALL EDGES OF EACH INDIVIDUAL PIECE

SILL BOLT

EXISTING CRIPPLE STUDS	Col2	Col3	Col4
EXISTING CRIPPLE STUDS 2x BLOCKING F CONNECT TO S SHEET METAL 2-IN.- TO 3-IN HOLES. SEE SEE ALTERNATES BELOW FOR VERTICAL PANEL JOINTS 8d NAILS AT 12 IN. ON CENTE STUDS.

CPC § 17958.5 Medium relevance — show source text
Amendments, additions, and_ deletions to this code adopted by a city, county, or city and county pursuant to California Health and Safety Code Sections 17958.5, 17958.7, and 18941.5, together with all applicable portions of this code, shall also become effective 180 days after publication of the Cali- fornia Building Standards Code by the California Build- ing Standards Commission.

1.8.6.2 Findings, Filings, and Rejections of Local Mod- ifications. Prior to making any modifications or estab- lishing more restrictive building standards, the governing body shall make express findings and filings, as required by California Health and Safety Code Section 17958.7, showing that such modifications are reasonably neces- sary due to local climatic, geological, or topographical conditions. No modification shall become effective or operative unless the following requirements are met:

1. The express findings shall be made available as a public record.

2. A copy of the modification and express finding, each document marked to cross-reference the other, shall be filed with the California Building Standards Commission for a city, county, or a city and county, and with the Department of Housing and Commu- nity Development for fire protection districts.

3. The California Building Standards Commission has not rejected the modification or change.

Nothing in this section shall limit the authority of fire protection districts pursuant to California Health and Safety Code Section 13869.7(a).

1.8.7 Alternate Materials, Designs, Tests, and Methods of Construction.

1.8.7.1 General. The provisions of this code, as adopted by the Department of Housing and Community Develop- ment, are not intended to prevent the use of any alternate material, appliance, installation, device, arrangement, design, or method of construction not specifically pre- scribed by this code. Consideration and approval of alternates shall comply with Section 1.8.7.2 for local

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DIVISION I CALIFORNIA ADMINISTRATION

building departments and Section 1.8.7.3 for the Depart- ment of Housing and Community Development.

1.8.7.2 Local Building Departments. The building depart- ment of any city, county, or city and county may approve alternates for use in the erection, construction, recon- struction, movement, enlargement, conversion, alteration, repair, removal, demolition, or arrangement of apartments, condominiums, hotels, motels, lodging houses, dwellings, or accessory structures, except for the following:

1. Structures located in mobilehome parks as defined in California Health and Safety Code Section 18214.

2. Structures located in special occupancy parks as defined in California Health and Safety Code Sec- tion 18862.43.

3. Factory-built housing as defined in California Health and Safety Code Section 19971.

1.8.7.2.1 Approval of Alternates. The consideration and approval of alternates by a local building department shall comply with the following proce- dures and limitations:
California Plumbing Code Medium relevance — show source text
|
Fail| |b.
Force the time between 9:00 p.m. and 9:00 a.m. and simulate a partial or no charge of the tank and
simulate no cooling load by setting the indoor temperature setpoint higher than the ambient tempera-
ture. Verify that the TES system starts charging (storing energy).|
Pass| |b.
Force the time between 9:00 p.m. and 9:00 a.m. and simulate a partial or no charge of the tank and
simulate no cooling load by setting the indoor temperature setpoint higher than the ambient tempera-
ture. Verify that the TES system starts charging (storing energy).|
Fail| |c.
Force the time to be between 6:00 p.m. and 9:00 p.m. and simulate a partial charge on the tank and
simulate a cooling load by setting the indoor temperature set point lower than the ambient tempera-
ture. Verify that the TES system starts discharging.|
Pass| |c.
Force the time to be between 6:00 p.m. and 9:00 p.m. and simulate a partial charge on the tank and
simulate a cooling load by setting the indoor temperature set point lower than the ambient tempera-
ture. Verify that the TES system starts discharging.|
Fail| |d.
Force the time to be between noon and 6:00 p.m. and simulate a cooling load by lowering the indoor
air temperature set point below the ambient temperature. Verify that the tank starts discharging and
the compressor is off. For systems designed to meet partial loads the system should be run until the
TES storage is fully depleted. The number of hours of operation must meet or exceed the designed
operational hours for the system.|
Pass| |d.
Force the time to be between noon and 6:00 p.m. and simulate a cooling load by lowering the indoor
air temperature set point below the ambient temperature. Verify that the tank starts discharging and
the compressor is off. For systems designed to meet partial loads the system should be run until the
TES storage is fully depleted. The number of hours of operation must meet or exceed the designed
operational hours for the system.|
Fail| |e.
Force the time to be between 9:00 a.m. to noon, and simulate a cooling load by lowering the indoor
air temperature set point below the ambient temperature. Verify that the tank does not discharge and
the cooling load is met by the compressor only.|
Pass| |e.
Force the time to be between 9:00 a.m. to noon, and simulate a cooling load by lowering the indoor
air temperature set point below the ambient temperature. Verify that the tank does not discharge and
the cooling load is met by the compressor only.|
Fail| |f.
Force the time to be between 9:00 p.m. and 9:00 a.m. and simulate a full tank charge by changing the
output of the sensor to the EMS. Verify that the tank charging is stopped.|
Pass| |f.
Force the time to be between 9:00 p.m. and 9:00 a.m.
CPC § 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.

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), 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
CPC § 2419-14 Medium relevance — show source text
(1) Locations with a high groundwater table or high hydraulic gradient.

(2) Locations where ground settlement over time is a concern.

(3) In trenches where the native material is not free-draining, for example, soils with high clay and silt content.

C. Sand used in 0-sack slurry must meet the requirements in EMS-4123 with the following additions:

(1) The sand must be washed and free of fine organic silts and clays.

(2) Sand equivalent equal to or greater than 20 per ASTM D-2419-14, “Standard Test Method for Sand Equivalent Value of Solid and Fine Aggregate.”

D. In a trench that contains voids, consider using a concrete vibrator to assist with consolidation under pipe and voids created by shoring removal, etc.

PG&E Internal Information “PG&E” refers to Pacific Gas and Electric Company, a subsidiary of PG&E Corporation.

©2020 Pacific Gas and Electric Company. All rights reserved.

Page 9 of 12

Gas Trench Design and Construction A-03

Publication Date: 08/19/2020 Effective Date: 11/16/2020 Rev. 0a

6.2 (continued)

E. Testing

(1) When required to be tested, 0-sack slurry must be tested using the following tests:

a) ASTM D-1557, “Laboratory Compaction Characteristics of Soil Using Modified Effort” or equivalent.

b) ASTM D6938-15, “Standard Test Methods for In-Place Density and Water Content of Soil and Soil-Aggregate by Nuclear Methods (Shallow Depth).”

Target Audience

The following personnel: gas transmission and distribution (T&D) construction, gas T&D general construction, gas engineering and design, gas transmission engineering and design, gas distribution engineering and design, gas maintenance and construction, gas T&D pipeline operations and maintenance, DIMP engineering, TIMP pipeline services, and facility integrity management program (FIMP) plant services.

Definitions

NA

Compliance Requirement / Regulatory Commitment

California Public Utilities Code, Article 3, Equipment, Practices, and Facilities, Section 787

Code of Federal Regulations (CFR) Title 49, Transportation, Part 192—Transportation of Natural and Other Gas by Pipeline: Minimum Federal Safety Standards, Section 192.319, “Installation of pipe in a ditch.”

Page 10 of 12 “PG&E” refers to Pacific Gas and Electric Company, a subsidiary of PG&E Corporation.

©2020 Pacific Gas and Electric Company. All rights reserved.

PG&E Internal Information

Gas Trench Design and Construction A-03

Publication Date: 08/19/2020 Effective Date: 11/16/2020 Rev. 0a

References

American Concrete Institute (ACI) 229R-99 Controlled Low-Strength Materials

American Society for Testing and Materials (ASTM) D2488-09a, “Standard Practice for Description and Identification of Soils (Visual-Manual Procedure)”

ASTM D698-12, “Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Standard Effort”

ASTM D1557-12, “Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Modified Effort”

ASTM C136-14, “Standard Test Method for Sieve Analysis of Fine and Coarse Aggregates”

ASTM D2487-11, “Standard Classification of Soils for Engineering Purposes (Unified Soil Classification System)”
CPC § 310.13 Medium relevance — show source text
ante rooms.

310.13 [SFM] For applications listed in Section 1.11.0 regu- lated by the Office of the State Fire Marshal, plastic piping shall not be exposed as a portion of the interior room finish in a build- ing or structure if the piping has a flame-spread rating exceed- ing 75 when tested in accordance with ASTM E84, “Test for Surface Burning Characteristics of Building Materials.” 310.14 Services/Systems and Utilities. [OSHPD 1, 2, 4 & 5] Refer to Sections 1224.4.1, 1225.2.1 and 1228.4.1.1, Cal- ifornia Building Code. 310.15 Telephone and Data Equipment Rooms.

[OSHPD 1, 4 & 5] Where telecommunications service entrance rooms, technology equipment centers, or technology distribution rooms are provided in accordance with Section 1224.5 of the California Building Code, plumbing equipment and fixtures that are not directly related to the support of the room shall not be installed in or pass through the room.

311.0 Independent Systems. 311.1 General. The drainage system of each new building and new work installed in an existing building shall be separate and independent from that of any other building, and, where available, every building shall have an independent connection with a public or private sewer.

Exception: Where one building stands in the rear of another building on an interior lot, and no public or private sewer is available or can be constructed to the rear building through an adjoining court, yard, or driveway, the building drain from the front building shall be permitted to be extended to the rear building.

Note: Accessory dwelling units are not required to have inde- pendent service utility (drainage) connections provided they meet the specific requirements in Government Code Section 65852.2.

312.0 Protection of Piping, Tubing, Materials, and Structures.

312.1 General. Piping passing under or through walls shall be protected from breakage. Piping passing through or under cinders or other corrosive materials shall be protected from external corrosion in an approved manner. Approved provisions shall be made for expansion of hot water piping. Voids around piping passing through concrete floors on the ground shall be sealed.

312.2 Installation. Piping in connection with a plumbing system shall be so installed that piping or connections will not be subject to undue strains or stresses, and provisions shall be made for expansion, contraction, and structural settlement. No plumbing piping shall be directly embedded in concrete or masonry. No structural member shall be seriously weakened or impaired by cutting, notching, or otherwise, as defined in the California Building Code or California Residential Code . 312.3 Building Sewer and Drainage Piping. No building sewer or other drainage piping or part thereof, 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 less than 1 foot (305 mm) below the surface of the ground. 312.4 Corrosion, Erosion, and Mechanical Damage. Piping subject to corrosion, erosion, or mechanical damage shall be protected in an approved manner. **312.5 Protectively Coated Pipe.

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

CPC § 1207.6 Medium relevance — show source text

TABLE 1207.6—ELECTROCHEMICAL ESS TECHNOLOGY-SPECIFIC REQUIREMENTS	Col2	Col3	Col4	Col5	Col6	Col7	Col8	Col9	Col10
COMPLIANCE REQUIREDb	COMPLIANCE REQUIREDb	BATTERY TECHNOLOGY	BATTERY TECHNOLOGY	BATTERY TECHNOLOGY	BATTERY TECHNOLOGY	BATTERY TECHNOLOGY	BATTERY TECHNOLOGY	OTHER ESS AND BATTERY TECHNOLOGIESb	CAPACITOR ESSb
Feature	Section	Lead- acid	Nickel cadmium (Ni-Cd), nickel-metal hydride (Ni-MH) and nickel zinc (Ni-Zn)	Zinc- manganese dioxide (Zn-MnO2)	Lithium-ion	Flow	Sodium nickel chloride	Sodium nickel chloride	Sodium nickel chloride
Exhaust ventilation	1207.6.1	Yes	Yes	Yes	No	Yes	No	Yes	Yes
Explosion control	1207.6.3	Yesa	Yesa	Yes	Yes	No	Yes	Yes	Yes
Safety caps	1207.6.4	Yes	Yes	No	No	No	No	Yes	Yes
Spill control and neutralization	1207.6.2	Yesc	Yesc	Yesf	No	Yes	No	Yes	Yes
Thermal runaway	1207.6.5	Yesd	Yes	Yese	Yese	No	Yes	Yese	Yes
a. Not required for lead-acid and nickel-cadmium batteries at facilities under the exclusive control of communications utilities that comply with NFPA 76 and operate at less than 50 VAC and 60 VDC. b. Protection shall be provided unless documentation acceptable to the fire code official is provided in accordance with Section 104.2.2 that provides justification why the protection is not necessary based on the technology used. c. Applicable to vented-type (i.e., flooded) nickel-cadmium and lead-acid batteries. d. Not required for vented-type (i.e., flooded) batteries. e. The thermal runaway protection is permitted to be part of a battery management system that has been evaluated with the battery as part of the evaluation to UL 1973. f. Not required for batteries with jelled electrolyte.	a. Not required for lead-acid and nickel-cadmium batteries at facilities under the exclusive control of communications utilities that comply with NFPA 76 and operate at less than 50 VAC and 60 VDC. b. Protection shall be provided unless documentation acceptable to the fire code official is provided in accordance with Section 104.2.2 that provides justification why the protection is not necessary based on the technology used. c.

CPC § 1.8.7.3 Medium relevance — show source text
3. The local building department may require tests performed by an approved testing agency at the expense of the owner or owner’s agent as proof of compliance.

4. If the proposed alternate is related to accessi bil- ity in covered multifamily dwellings or facilities serving covered multifamily dwellings, as defined in Chapter 2 of the California Building Code, the proposed alternate must also meet the threshold set for equivalent facilitation as defined in Chapter 2 of the California Building Code.

For additional information regarding approval of alternates by a local building department pur- suant to the State Housing Law, see California Health and Safety Code Section 17951(e) and Cali- fornia Code of Regulations, Title 25, Division 1, Chapter 1, Subchapter 1.

1.8.7.3 Department of Housing and Community Devel- opment. The Department of Housing and Community Development may approve alternates for use in the erec- tion, construction, reconstruction, movement, enlarge- ment, conversion, alteration, repair, removal, or demolition of apartments, condominiums, hotels, motels, lodging houses, dwellings, or accessory structures thereto, and permanent buildings in mobilehome parks and special occupancy parks. The consideration and approval of alternates shall comply with the following:

1. The department may require tests at the expense of the owner or owner’s agent to substantiate compli- ance with the California Building Standards Code.

2. The approved alternate shall, for its intended pur- pose, be at least equivalent in performance and safety to the materials, designs, tests, or methods of construction prescribed by this code.

1.8.8 Appeals Board.

1.8.8.1 General. Every city, county, or city and county shall establish a process to hear and decide appeals of orders, decisions, and determinations made by the enforc- ing agency relative to the application and interpretation of this code and other regulations governing construction use, maintenance and change of occupancy. The govern- ing body of any city, county, or city and county may estab- lish a local appeals board and a housing appeals board to serve this purpose. Members of the appeals board(s) shall not be employees of the enforcing agency and shall be knowledgeable in the applicable building codes, reg- ulations and ordinances as determined by the governing body of the city, county, or city and county.

Where no such appeals boards or agencies have been established, the governing body of the city, county, or city and county shall serve as the local appeals board or housing appeals board as specified in California Health and Safety Code Sections 17920.5 and 17920.6.

1.8.8.2 Definitions. The following terms shall for the purposes of this section have the meaning shown.
CPC § 0.375 Medium relevance — show source text
60**| |||TUBE SIZE (inch)|TUBE SIZE (inch)|TUBE SIZE (inch)|TUBE SIZE (inch)|TUBE SIZE (inch)|TUBE SIZE (inch)|TUBE SIZE (inch)|TUBE SIZE (inch)|TUBE SIZE (inch)| |NOMINAL:|K & L:|1⁄4|3⁄8|1⁄2|5⁄8|3⁄4|1|11⁄4|11⁄2|2| |NOMINAL:|ACR:|3⁄8|1⁄2|5⁄8|3⁄4|7⁄8|11⁄8|13⁄8|–|–| |OUTSIDE:|OUTSIDE:|0.375|0.500|0.625|0.750|0.875|1.125|1.375|1.625|2.125| |INSIDE:1|INSIDE:1|0.305|0.402|0.527|0.652|0.745|0.995|1.245|1.481|1.959| |LENGTH (feet)|LENGTH (feet)|CAPACITY IN CUBIC FEET OF GAS PER HOUR|CAPACITY IN CUBIC FEET OF GAS PER HOUR|CAPACITY IN CUBIC FEET OF GAS PER HOUR|CAPACITY IN CUBIC FEET OF GAS PER HOUR|CAPACITY IN CUBIC FEET OF GAS PER HOUR|CAPACITY IN CUBIC FEET OF GAS PER HOUR|CAPACITY IN CUBIC FEET OF GAS PER HOUR|CAPACITY IN CUBIC FEET OF GAS PER HOUR|CAPACITY IN CUBIC FEET OF GAS PER HOUR| |10
20
30
40
50|10
20
30
40
50|245
169
135
116
103|506
348
279
239
212|1030
708
568
486
431|1800
1240
993
850
754|2550
1760
1410
1210
1070|5450
3750
3010
2580
2280|9820
6750
5420
4640
4110|15 500
10 600
8550
7310
6480|32 200
22 200
17 800
15 200
13

CPC § 25.4 Medium relevance — show source text

Where the roof span exceeds 32 feet, the wall studs shall be increased to 2 × 6 or the
studs shall be designed in accordance with accepted engineering practice.|For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.
a. Listed heights are distances between points of lateral support placed perpendicular to the plane of the wall. Bearing walls shall be sheathed on not less than one side or bridg-
ing shall be installed not greater than 4 feet apart measured vertically from either end of the stud. Increases in unsupported height are permitted where in compliance with
Exception 2 of Section R602.3.1 or designed in accordance with accepted engineering practice.
b. Shall not be used in exterior walls.
c. A habitable attic assembly supported by 2 × 4 studs is limited to a roof span of 32 feet. Where the roof span exceeds 32 feet, the wall studs shall be increased to 2 × 6 or the
studs shall be designed in accordance with accepted engineering practice.|For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.
a. Listed heights are distances between points of lateral support placed perpendicular to the plane of the wall. Bearing walls shall be sheathed on not less than one side or bridg-
ing shall be installed not greater than 4 feet apart measured vertically from either end of the stud. Increases in unsupported height are permitted where in compliance with
Exception 2 of Section R602.3.1 or designed in accordance with accepted engineering practice.
b. Shall not be used in exterior walls.
c. A habitable attic assembly supported by 2 × 4 studs is limited to a roof span of 32 feet. Where the roof span exceeds 32 feet, the wall studs shall be increased to 2 × 6 or the
studs shall be designed in accordance with accepted engineering practice.|For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.
a. Listed heights are distances between points of lateral support placed perpendicular to the plane of the wall. Bearing walls shall be sheathed on not less than one side or bridg-
ing shall be installed not greater than 4 feet apart measured vertically from either end of the stud. Increases in unsupported height are permitted where in compliance with
Exception 2 of Section R602.3.1 or designed in accordance with accepted engineering practice.
b. Shall not be used in exterior walls.
c. A habitable attic assembly supported by 2 × 4 studs is limited to a roof span of 32 feet. Where the roof span exceeds 32 feet, the wall studs shall be increased to 2 × 6 or the
studs shall be designed in accordance with accepted engineering practice.|

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WALL CONSTRUCTION

TABLE R602.3(6)—ALTERNATE WOOD BEARING WALL STUD SIZE, HEIGHT AND SPACING	Col2	Col3	Col4	Col5	Col6	Col7	Col8	Col9
STUD HEIGHT	SUPPORTING	STUD SPACINGa	ULTIMATE DESIGN WIND SPEED	ULTIMATE DESIGN WIND SPEED	**

CPC § 204.0 Medium relevance — show source text
0
204.0
206.0
207.0
208.0
209.0
210.0
214.0
215.0
216.0
217.0
222.0
223.0
228.0
|||X|X|X|||||X|X|X|X|X|X|X||||||||| |Adopting Agency
Adopt Entire Chapter
Adopt Entire Chapter as
amended (amended sections
listed below)
Adopt only those sections
that are listed below
Chapter/Section
203.0
204.0
206.0
207.0
208.0
209.0
210.0
214.0
215.0
216.0
217.0
222.0
223.0
228.0
||||||||||X||X|X|X|X||||||||||

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.

2025 CALIFORNIA MECHANICAL CODE 29

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

30 2025 CALIFORNIA MECHANICAL CODE

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

CHAPTER 2

DEFINITIONS

201.0 General.

201.1 Applicability. For the purpose of this code, the following terms have the meanings indicated in this chapter.

No attempt is made to define ordinary words, which are used in accordance with their established dictionary meanings, except where a word has been used loosely, and it is necessary to define its meaning as used in this code to avoid misunderstanding.

202.0 Definition of Terms.

202.1 General. The definitions of terms are arranged alphabetically according to the first word of the term.

203.0 – A –

Absorption Unit. An absorption refrigeration system that has been factory-assembled and tested prior to its installation.

Accepted Engineering Practice. That which conforms to technical or scientific-based principles, test, or standards that are accepted by the engineering profession.

Access Panel. A closure device used to cover an opening into a duct, an enclosure, equipment, or an appurtenance.

[NFPA 96:3.3.1]

Accessible. Where applied to a device, appliance, or equipment, “accessible” means having access thereto, but which first may require the removal of an access panel, door, or similar obstruction.

Accessible, Readily. Having a direct access without the necessity of removing a panel, door, or similar obstruction.
CPC § 3-20 Medium relevance — show source text
3-20 2025 CALIFORNIA RESIDENTIAL CODE

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BUILDING PLANNING

8.2. The tallest cripple wall clear height exceeds 7 feet (2134 mm), or where a post and beam system occurs at the building perimeter, the post and beam system tallest post clear height exceeds 7 feet (2134 mm). 8.3. Of the total plan area below the lowest framed floor, whether open or enclosed, less than 50 percent is living space having interior wall finishes conforming to Section R702.

Where Item 8 is applicable, design in accordance with accepted engineering practice shall be provided for the floor immediately above the cripple walls or post and beam system and all structural elements and connections from this diaphragm down to and including connections to the foundation and design of the foundation to transfer lateral loads from the framing above.

Exception: Light-frame construction in which the lowest framed floor is supported directly on concrete or masonry walls over the full length of all sides except the downhill side of the building need not be considered an irregular building under Item 8.

R301.2.2.7 Height limitations. Wood-framed buildings shall be limited to three stories above grade plane or the limits given in Table R602.10.3(3). Wood-framed buildings in Seismic Design Category D 2 exceeding two stories shall be designed for wind and seismic loads in accordance with accepted engineering practice. Cold-formed steel-framed buildings shall be limited to less than or equal to three stories above grade plane in accordance with AISI S230. Mezzanines as defined in Section R202 that comply with Section R314 shall not be considered as stories. Structural insulated panel buildings shall be limited to two stories above grade plane.

R301.2.2.8 Cold-formed steel framing in Seismic Design Categories D 0 , D 1 and D 2 . In Seismic Design Categories D 0, D 1 and D 2 in addition to the requirements of this code, cold-formed steel framing shall comply with the requirements of AISI S230.

R301.2.2.9 Masonry chimneys. In Seismic Design Categories D 0, D 1 and D 2, masonry chimneys shall be reinforced and anchored to the building in accordance with Sections R1003.3 and R1003.4.

R301.2.2.10 Seismic restraint of appliances and equipment. In Seismic Design Categories D 0, D 1 and D 2 and in townhouses in Seismic Design Category C, appliances and equipment that are designed to be fixed in position shall be supported and braced or anchored to the structure in accordance with the component manufacturer’s recommendations or per Section R301.2.2.10.1.

Exceptions: Seismic support, bracing and anchorage are not required for the following:
1. Suspended mechanical ducts, electrical conduit, automatic sprinkler systems and plumbing systems.
2. Where the appliance or equipment is bearing on an elevated floor or roof and the housing height is not greater than 1.5 times the width of the housing base in either direction.
3. Where the installed weight of a suspended appliance or equipment is 50 pounds (22.7 kg) or less.
4. Where the installed weight is 400 pounds (181.4 kg) or less and the bottom of the appliance or equipment is 4 feet (1219 mm) or less above the adjacent floor level.

CPC § 1.2.2 Medium relevance — show source text

see Note 2; facings: both
sides 1″ thickness of 1:1/2; 1:1/2 gypsum plaster.|N/A|2 hrs||1|||2| |W-4-Me-4|4″|Core: steel; see Note 2; facings: both sides 1″
thickness of 1:2; 1:3 gypsum plaster.|N/A|1 hr
15 min||1|||11/4| |W-4-Me-5|41/2″|Core: lightweight steel studs 3″ in depth;
facings: both sides3/4″ thick sanded gypsum
plaster, 1:2 scratch coat, 1:3 brown coat
applied on metal lath.|See
Note 4|45 min||1||5|3/4| |W-4-Me-6|41/2″|Core: lightweight steel studs 3″ in depth;
facings: both sides3/4″ thick neat gypsum plas-
ter on metal lath.|See
Note 4|1 hr
30 min||1||5|11/2| |W-4-Me-7|41/2″|Core: lightweight steel studs 3″ in depth;
facings: both sides3/4″ thick sanded
gypsum plaster, 1:2 scratch and brown coats
applied on metal lath.|See
Note 4|1 hr||1||5|1| |W-4-Me-8|43/4″|Core: lightweight steel studs 3″ in depth;
facings: both sides7/8″ thick sanded
gypsum plaster, 1:2 scratch coat, 1:3 brown
coat, applied on metal lath.|See
Note 4|1 hr||1||5|1| |W-4-Me-9|43/4″|Core: lightweight steel studs 3″ in depth;
facings: both sides7/8″ thick sanded
gypsum plaster, 1:2 scratch and 1:3 brown
coats applied on metal lath.|See
Note 4|1 hr
15 min||1||5|11/4|

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

TABLE 1.2.2—continued METAL FRAME WALLS 4″ TO LESS THAN 6″ THICK	Col2	Col3	Col4	Col5	Col6	Col7	Col8	Col9	Col10
ITEM CODE	THICKNESS	CONSTRUCTION DETAILS	PERFORMANCE	PERFORMANCE	REFERENCE NUMBER	REFERENCE NUMBER	REFERENCE NUMBER	NOTES	**REC.

CPC § 1.6 Medium relevance — show source text
Piers supporting girders for interior bearing walls shall have a minimum nominal dimension of 12 inches (305 mm) and a maximum height of 10 feet (3048 mm) from top of footing to bottom of sill plate or girder. Piers supporting girders for exterior bearing walls shall have a minimum nominal dimension of 12 inches (305 mm) and a maximum height of 4 feet (1220 mm) from top of footing to bottom of sill plate or girder. Girders and sill plates shall be anchored to the pier or footing in accordance with Section R403.1.6 or Figure R404.1.5.3. Floor girder bearing shall be in accordance with Section R502.6.

R404.1.9.3 Masonry piers supporting braced wall panels. Masonry piers supporting braced wall panels shall be designed in accordance with accepted engineering practice.

R404.1.9.4 Seismic design of masonry piers. Masonry piers in dwellings located in Seismic Design Category D 0, D 1 or D 2, and townhouses in Seismic Design Category C, shall be designed in accordance with accepted engineering practice.

R404.1.9.5 Masonry piers in flood hazard areas. Masonry piers for dwellings in flood hazard areas shall be designed in accordance with Section R306.

R404.2 Wood foundation walls. Wood foundation walls shall be constructed in accordance with the provisions of Sections R404.2.1 through R404.2.6 and with the details shown in Figures R403.1(2) and R403.1(3).

R404.2.1 Identification. Load-bearing lumber shall be identified by the grade mark of a lumber grading or inspection agency that has been approved by an accreditation body that complies with DOC PS 20. In lieu of a grade mark, a certificate of inspection issued by a lumber grading or inspection agency meeting the requirements of this section shall be accepted. Wood structural panels shall conform to DOC PS 1 or DOC PS 2 and shall be identified by a grade mark or certificate of inspection issued by an approved agency.

R404.2.2 Stud size. The studs used in foundation walls shall be 2-inch by 6-inch (51 mm by 152 mm) members. Where spaced 16 inches (406 mm) on center, a wood species with an F b value of not less than 1,250 pounds per square inch (8619 kPa) as listed in ANSI AWC NDS shall be used. Where spaced 12 inches (305 mm) on center, an F b of not less than 875 psi (6033 kPa) shall be required.

R404.2.3 Height of backfill. For wood foundations that are not designed and installed in accordance with AWC PWF, the height of backfill against a foundation wall shall not exceed 4 feet (1219 mm). Where the height of fill is more than 12 inches (305 mm) above the interior grade of a crawl space or floor of a basement, the thickness of the plywood sheathing shall meet the requirements of Table R404.2.3.

|TABLE R404.2.

CPC § 3-5 Medium relevance — show source text

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BUILDING PLANNING

R301.1.3 Engineered design. Where a building of otherwise conventional construction contains structural elements exceeding the limits of Section R301 or otherwise not conforming to this code, these elements shall be designed in accordance with accepted engineering practice. The extent of such design need only demonstrate compliance of nonconventional elements with other applicable provisions and shall be compatible with the performance of the conventional framed system. Engineered design in accordance with the California Building Code is permitted for buildings and structures, and parts thereof, included in the scope of this code.

R301.1.3.1 California licensed architect or engineer. When any portion of any structure deviates from substantial compliance with conventional framing requirements for woodframe construction found in this code, the building official shall require the construction documents to be approved and stamped by a California licensed architect or engineer for that irregular or non- conforming portion of work. Notwithstanding other sections of law, the law establishing these provisions is found in Business and Professions Code Sections 5537 and 6737.1.

R301.1.3.2 Woodframe structures greater than two-stories. The building official shall require construction documents to be approved and stamped by a California licensed architect or engineer for all dwellings of woodframe construction more than two stories and basement in height. Notwithstanding other sections of law, the law establishing these provisions is found in Business and Professions Code Sections 5537 and 6737.1.

R301.1.3.3 Structures other than woodframe. The building official shall require floor, wall or roof-ceiling structural elements in dwellings designed of cold-formed steel, concrete, masonry or structural insulated panels prescribed by this code to be approved and stamped by a California licensed architect or engineer. Notwithstanding other sections of law, the law establishing these provisions is found in Business and Professions Code Sections 5537 and 6737.1.

R301.1.4 Intermodal shipping containers. Intermodal shipping containers that are repurposed for use as buildings or structures shall be designed in accordance with the structural provisions in Section 3114 of the California Building Code .

R301.2 Climatic and geographic design criteria. Buildings shall be constructed in accordance with the provisions of this code as limited by the provisions of this section. Additional criteria shall be established by the local jurisdiction and set forth in Table R301.2.

TABLE R301.2—CLIMATIC AND GEOGRAPHIC DESIGN CRITERIA	Col2	Col3	Col4	Col5	Col6	Col7	Col8	Col9	Col10	Col11	Col12	Col13
GROUND SNOW LOADo	WIND DESIGN	WIND DESIGN	WIND DESIGN	WIND DESIGN	SEISMIC DESIGN CATEGORYf	SUBJECT TO DAMAGE FROM	SUBJECT TO DAMAGE FROM	SUBJECT TO DAMAGE FROM	ICE BARRIER UNDERLAYMEN T REQUIREDh	FLOOD HAZARDSg	**

CPC § 1.12.0 Medium relevance — show source text
1.4. Small family day care homes, large family day-care homes, residential facilities and resi- dential facilities for the elderly, residential care facilities.

1.5. State institutions or other state-owned or state-occupied buildings.

1.6. High rise structures.

1.7. Motion picture production studios.

1.8. Organized camps.

1.9. Residential structures.

2. Tents, awnings or other fabric enclosures used in connection with any occupancy.

3. Fire alarm devices, equipment and systems in connection with any occupancy.

4. Hazardous materials, flammable and com- bustible liquids.

5. Public school automatic fire detection, alarm and sprinkler systems.

6. Wildland-urban interface fire areas.

15. Section 1.12.0 is reserved for public libraries con- structed and renovated using funds from the Cali- fornia Library Construction and Renovation Bond Act of 1988 and regulated by the State Librarian.

16. Section 1.13.0 is reserved for the Department of Water Resources.

17. For applications listed in Section 1.9.1 regulated by the Division of the State Architect – Access Compli- ance, outdoor environments and uses shall be clas- sified according to accessibility uses described in Chapter 11A, and 11B.

18. Section 1.14.0 is reserved for Marine Oil Terminals regulated by the California State Lands Commission.

1.1.4 Appendices. Provisions contained in the appendices of this code shall not apply unless specifically adopted by a state agency or adopted by a local enforcing agency in compliance with Health and Safety Code Section 18901 et seq. for Building Standards Law, Health and Safety Code Section 17950 for State Housing Law and Health and Safety Code Section 13869.7 for Fire Protection Districts. See Section 1.1.8 of this code.

1.1.5 Referenced Codes. The codes, standards and publica- tions adopted and set forth in this code, including other codes, standards and publications referred to therein are, by title and date of publication, hereby adopted as standard reference documents of this code. When this code does not specifically cover any subject related to building design and construction, recognized architectural or engineering practices shall be employed. The National Fire Codes, standards, and the Fire Protection Handbook of the National Fire Protection Asso- ciation are permitted to be used as authoritative guides in determining recognized fire prevention engineering practices.

1.1.6 Non-Building Standards, Orders, and Regulations. Requirements contained in the Uniform Plumbing Code, or in any other referenced standard, code or document, which are not building standards as defined in Health and Safety Code Section 18909 shall not be construed as part of the provisions of this code. For nonbuilding standards, orders, and regula- tions, see other titles of the California Code of Regulations.

1.1.7 Order of Precedence and Use.

1.1.7.1 Differences. In the event of any differences between these building standards and the standard ref- erence documents, the text of these building standards shall govern.
CPC § 31-2022 Medium relevance — show source text
2025 CALIFORNIA PLUMBING CODE 453

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

454 2025 CALIFORNIA PLUMBING CODE

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

"The information contained in this appendix is not part of this American National Standard (ANS) and has not been processed in accordance with ANSI's requirements for an ANS. As such, this appendix may contain material that has not been subjected to public review or a consensus process. In addition, it does not contain requirements necessary for conformance to the standard."

The following IAPMO Installation Standard is included here for the convenience of the users of the Uniform Plumbing Code. It is not considered as a part of the Uniform Plumbing Code unless formally adopted as such. This Installation Standard is an independent, stand-alone document published by the International Association of Plumbing and Mechanical Officials and is printed herein by the expressed written permission of IAPMO.

INSTALLATION STANDARD FOR PEX TUBING SYSTEMS

FOR HOT- AND COLD-WATER DISTRIBUTION

IAPMO IS 31-2022

The provisions contained in this appendix are not mandatory unless specifically adopted by a state agency, or referenced in the adopting ordinance.

1 Scope

1.1 General

1.1.1 This Standard specifies requirements for the installation of SDR 9 CTS crosslinked polyethylene (PEX) tubing and fittings, including cold-expansion, crimp, press, and mechanical compression fittings, intended for hot- and cold-water distribution systems within buildings.

1.1.2 This Standards applies to

(a) SDR 9 CTS PEX tubing complying with ASTM F876 and pressure-rated in accordance with PPI TR-3; and (b) PEX fitting systems complying with (i) ASTM F877, for mechanical compression fittings and metal or plastic insert fittings with stainless steel press sleeves; (ii) ASTM F1807 or ASTM F2159, for metal or plastic insert fittings with copper crimp rings; (iii) ASTM F1960, for cold expansion fittings with PEX reinforced rings; or (iv) ASTM F2080, for cold expansion fittings with metal compression sleeves. 1.2 Terminology

In this Standard,

(a) “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy to comply with the Standard; (b) “should” is used to express a recommendation, but not a requirement; (c) “may” is used to express an option or something permissible within the scope of the Standard; and (d) “can” is used to express a possibility or a capability. Notes accompanying sections of the Standard do not specify requirements or alternative requirements; their purpose is to separate explanatory or informa

tive material from the text. Notes to tables and figures are considered part of the table or figure and can be written as requirements.

1.3 Units of Measurement

SI units are the primary units of record in global commerce. In this Standard, the inch/pound units are shown in parentheses. The values stated in each measurement system are equivalent in application, but each unit system is to be used independently. All references to gallons are to U.S. gallons.

2 Reference Publications
CPC § 1205.1 Medium relevance — show source text
1205.1 Authorized Personnel . . . . . . . . . .216

1205.2 Outlets . . . . . . . . . . . . . . . . . . . . .216

1206.0 Authority to Disconnect . . . . . . . .216

1206.1 Disconnection . . . . . . . . . . . . . . . .216

1206.2 Notice . . . . . . . . . . . . . . . . . . . . . .216

1206.3 Capped Outlets . . . . . . . . . . . . . . .216

1207.0 Temporary Use of Gas . . . . . . . . .216

1207.1 General . . . . . . . . . . . . . . . . . . . . .216

1208.0 Gas Piping System Design, Materials, and Components . . . . .216

1208.1 Installation of Piping System . . . .216

1208.2 Interconnections Supplying Separate Users . . . . . . . . . . . . . . .216

1208.3 Sizing of Gas Piping Systems . . .216

Table 1208.3.1 Approximate Gas Input for Typical Appliances . . . . . . . . . . . .217

1208.4 Maximum Operating Pressure in Buildings . . . . . . . . . . . . . . . . . .217

1208.5 Acceptable Piping Materials and Joining Methods . . . . . . . . . .217

Table 1208.5.8.2 Specifications for Threading Metallic Pipe . . . . . . . . . . . . . . . . .219

1208.6 Gas Meters . . . . . . . . . . . . . . . . . .220

1208.7 Gas Pressure Regulators . . . . . . .221

1208.8 Overpressure Protection Required . . . . . . . . . . . . . . . . . . . .221

1208.9 Overpressure Protection Devices . . . . . . . . . . . . . . . . . . . . .221

1208.10 Pressure Limitation

Requirements . . . . . . . . . . . . . . . .222

1208.11 Backpressure Protection . . . . . . .222

1208.12 Low-Pressure Protection . . . . . . .222

1208.13 Shutoff Valves . . . . . . . . . . . . . . .222

1208.14 Expansion and Flexibility . . . . . . .222

1208.15 Pressure Regulator and Pressure Control Venting . . . . . . .222

Table 1208.13 Manual Gas Valve Standards . . . .223

1209.0 Excess Flow Valve . . . . . . . . . . . .223

1209.1 General . . . . . . . . . . . . . . . . . . . . .223

1210.0 Gas Piping Installation . . . . . . . . .223

1210.1 Piping Underground . . . . . . . . . . .223

1210.2 CSST Piping Systems . . . . . . . . .225

1210.3 Installation of Aboveground Piping . . . . . . . . . . . . . . . . . . . . . .225
CPC § 1201.0 Medium relevance — show source text
1201.0 General . . . . . . . . . . . . . . . . . . . . .215

1201.1 Applicability . . . . . . . . . . . . . . . . . .215

1202.0 Coverage of Piping System . . . . .215

1202.1 General . . . . . . . . . . . . . . . . . . . . .215

1202.2 Piping System Requirements . . . .215

1202.3 Applications . . . . . . . . . . . . . . . . .215

1203.0 Inspection . . . . . . . . . . . . . . . . . . .215

1203.1 Inspection Notification . . . . . . . . .215

1203.2 Excavation . . . . . . . . . . . . . . . . . .215

1203.3 Type of Inspections . . . . . . . . . . .215

1203.4 Inspection Waived . . . . . . . . . . . .216

1204.0 Certificate of Inspection . . . . . . . .216

1204.1 Issuance . . . . . . . . . . . . . . . . . . . .216

1204.2 Gas Supplier . . . . . . . . . . . . . . . . .216

1204.3 Unlawful . . . . . . . . . . . . . . . . . . . .216

1205.0 Authority to Render Gas Service . . . . . . . . . . . . . . . . . . . . .216

1205.1 Authorized Personnel . . . . . . . . . .216

1205.2 Outlets . . . . . . . . . . . . . . . . . . . . .216

1206.0 Authority to Disconnect . . . . . . . .216

1206.1 Disconnection . . . . . . . . . . . . . . . .216

1206.2 Notice . . . . . . . . . . . . . . . . . . . . . .216

1206.3 Capped Outlets . . . . . . . . . . . . . . .216

1207.0 Temporary Use of Gas . . . . . . . . .216

1207.1 General . . . . . . . . . . . . . . . . . . . . .216

1208.0 Gas Piping System Design, Materials, and Components . . . . .216

1208.1 Installation of Piping System . . . .216

1208.2 Interconnections Supplying Separate Users . . . . . . . . . . . . . . .216

1208.3 Sizing of Gas Piping Systems . . .216

Table 1208.3.1 Approximate Gas Input for Typical Appliances . . . . . . . . . . . .217

1208.4 Maximum Operating Pressure in Buildings . . . . . . . . . . . . . . . . . .217

1208.5 Acceptable Piping Materials and Joining Methods . . . . . . . . . .217

Table 1208.5.8.2 Specifications for Threading Metallic Pipe . . . . . . . . . . . . . . . . .219
CPC § 1305.2.3.3 Medium relevance — show source text
2, 1305.2.3.3, 1305.2.4.1, 1305.2.5, 1305.2.5.1, 1305.2.6, 1305.2.7.1, 1305.2.8, 1305.2.9, 1305.2.9.1, 1305.2.10, 1305.2.10.1, 1305.2.11, 1305.2.11.1, 1305.2.12.1, 1305.2.13, Table 1305.2.15, 1305.2.15.1, 1305.2.16.1, 1305.2.17, 1305.2.17.1, 1305.2.18, 1305.2.18.1, 1305.2.19, Table 1305.2.19, 1305.2.20, 1305.2.20.1, 1307.1.1, 1401.2, 1402.1, 1402.2, 1402.2.1, 1402.3, 1402.4, 1402.5, 1402.6, 1501.5, 1504.1.1, 1504.1.4.1, 1504.1.7, 1509.1, 1509.3, 1510.1

CEC — 25 : California Energy Code

302.2, 702.7, 708.1, 809.1, 907.1, 1104.1

CFC—25: California Fire Code

101.2.2, 101.4.2, 301.3.1, 302.2, 307.1, 308.1, 802.2.1, 802.2.3, 803.2.3, 803.4.1.1, 803.4.1.2, 803.4.1.3, 803.4.1.4, 803.4.1.5, 803.4.1.6, Table 804.5.1.1(1), 904.1.5, 1011.6.1.1, 1303.1.2, 1305.2.8.1, 1305.2.14, 1305.2.14.1, 1401.2, 1501.1, 1501.5, 1502.1, 1502.1.1, 1502.2, 1502.3, 1504.1, 1507.1, 1507.2

CMC—25: California Mechanical Code

302.2, 702.7, 807.1, 902.1.1, 1008.1, 1305.2.7.1, 1305.2.8, 1305.2.8.1

CPC—25: California Plumbing Code

302.2, 408.1, 702.7, 1009.1, 1009.2, 1009.3, 1009.5, 1302.1.6, 1503.1
California Plumbing Code Medium relevance — show source text

44
66
78|524
321
316
310|285
217
211
205| |8|0
2
5
8|0
12
23
28|84
57
53
49|50
40
38
35|0
16
32
39|165
109
103
98|94
75
71
66|0
25
42
51|276
178
171
164|155
120
115
109|0
28
53
64|415
263
255
247|235
180
173
165|0
42
70
84|583
365
356
347|320
247
237
227| |10|0
2
5
10|0
12
23
30|88
61
57
51|53
42
40
36|0
17
32
41|175
118
113
104|100
81
77
70|0
23
41
54|295
194
187
176|166
129
124
115|0
26
52
67|447
289
280
267|255
195
188
175|0
40
68
88|631
402
392
376|345
273
263
245| |15|0
2
5
10
15|0
11
22
29
35|94
69
65
59
53|58
48
45
41
37|0
15
30
40
48|191
136
130
121
112|112
93
87
82
76|0
20
39
51
61|327
226
219
206
195|187
150
142
135
128|0
22
49
64
76|502
339
330
315
301|285
225
217
208
198|0
38
64
84
98|716
475
463
445
429|390
316
300
288
275| |20|0
2
5
10
15
20|0
10
21
28
34
48|97
75
71
64
58
52|61
51
48
44
40
35|0
14
29
38
46
55|202
149
143
133
124
116|119
100
96
89
84
78|0

CPC § 3.1 Medium relevance — show source text

10|23/4| |F/C-6-RC-25|6″|6″ deep (4800 psi) concrete deck;1/4″ rein-
forcement bars at 71/2″ pitch with7/8″
cover;3/8″ main reinforcement bars at
31/2″ pitch perpendicular with7/8″ cover;
13′1″ span restrained.|195
psf|4 hrs|||7|1, 7|4| |F/C-6-RC-26|6″|6″ (4650 psi) concrete deck;1/4″ reinforce-
ment bars at 71/2″ pitch with7/8″ cover;3/8″
main reinforcement bars at 31/2″ pitch
perpendicular with1/2″ cover; 13′1″ span
restrained.|195
psf|2 hrs
23 min|||7|1, 2|21/4| |F/C-6-RC-27|6″|6″ deep (6050 psi) concrete deck;1/4″ rein-
forcement bars at 71/2″ pitch with7/8″
cover;3/8″ reinforcement bars at 31/2″
pitch perpendicular with1/2″ cover; 13′1″
span restrained.|195
psf|3 hrs
30 min|||7|1, 10|31/2| |F/C-6-RC-28|6″|6″ deep (5180 psi) concrete deck;1/4″ rein-
forcement bars at 8″ pitch with3/4″ cover;
1/4″ reinforcement bars at 51/2″ pitch
perpendicular with1/2″ cover; 13′1″ span
restrained.|150
psf|4 hrs|||7|1, 7|4|

2025 CALIFORNIA EXISTING BUILDING CODE RESOURCE A-93

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

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

TABLE 3.1—continued FLOOR/CEILING ASSEMBLIES—REINFORCED CONCRETE	Col2	Col3	Col4	Col5	Col6	Col7	Col8	Col9	Col10
ITEM CODE	ASSEMBLY THICKNESS	CONSTRUCTION DETAILS	PERFORMANCE	PERFORMANCE	REFERENCE NUMBER	REFERENCE NUMBER	REFERENCE NUMBER	NOTES	REC. HOURS
ITEM CODE	ASSEMBLY THICKNESS	CONSTRUCTION DETAILS	LOAD	TIME	PRE-BMS-92	BMS-92	POST-BMS-92	POST-BMS-92	POST-BMS-92
F/C-6-RC-29	6″	6″ thick (4180 psi) concrete deck; 4″ × 3″ × 10 lbs R.S.J.; 2′6″ C.R.S.

California Plumbing Code Medium relevance — show source text

2
5
10
15|36
38
51
NA
NA|93
69
63
NA
NA|57
47
44
39
NA|56
57
75
95
NA|190
136
128
116
NA|111
93
86
79
72|80
80
102
128
158|325
225
216
201
186|186
149
140
131
124|116
115
144
182
220|499
337
326
308
290|283
224
217
203
192|153
148
182
228
272|713
473
459
438
418|388
314
298
284
269| |20|0
2
5
10
15
20|35
37
50
NA
NA
NA|96
74
68
NA
NA
NA|60
50
47
41
NA
NA|54
56
73
93
NA
NA|200
148
140
129
NA
NA|118
99
94
86
80
NA|78
78
100
125
155
186|346
248
239
223
208
192|201
165
158
146
136
126|114
113
141
177
216
254|537
375
363
344
325
306|306
248
239
224
210
196|149
144
178
222
264
309|772
528
514
491
469
448|428
344
334
316
301
285| |30|0
2
5
CPC § 1.1 Medium relevance — show source text
1.1_|||||||||X||X|X|||X|||||||||| |2101.1.2|||||||||X||X|X|||X|||||||||| |2101.1.3|||||||||X||X|X|||X|||||||||| |2101.1.4|||||||||X|||||||||||||||| |2101.1.5|||||||||X|||||||||||||||| |2101.2|||||||||||X|X|||X|||||||||| |2101.2.2|||||||||||X|X|||X|||||||||| |2103.1|||||||||||X|X|||X|||||||||| |2103.4|||||||||||X|X|||X|||||||||| |2103.5|||||||||||X|X|||X|||||||||| |2103.6|||||||||||X|X|||X|||||||||| |2104.2|||||||||||X|X|||X|||||||||| |2104.3|||||||||||X|X|||X|||||||||| |2105.2|||||||||||X|X|||X|||||||||| |2105.3|||||||||||X|X|||X|||||||||| |2105.4|||||||||||X|X|||X|||||||||| |2106.1.1|||||||||||X|X|||X|||||||||| |2106.1.2|||||||||||X|X|||X|||||||||| |2106.1.3|||||||||||X|X|||X|||||||||| |2107.1|||||||||||X|X|||X|||||||||| |2107.5|||||||||||X|X|||X|||||||||| |2109|||||||||||X|X|||X|||||||||| |2109.2.4.8.2|||||||||||||||||||||X|||| |2110.1|||||||||||X|X|||X|||||||||| |2113.9.2|||X|||||||||||||||||||||| |2115|||||||||X||||||||||||||||

The 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.

2025 CALIFORNIA BUILDING CODE 21-1

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

21-2 2025 CALIFORNIA BUILDING CODE

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

21 MASONRY

User notes:

About this chapter: Chapter 21 establishes minimum requirements for masonry construction. The provisions address: material specifications and test methods; types of wall construction; criteria for engineered and empirical designs; and required details of construction, including the execution of construction. The provisions provide a framework for applying applicable standards to the design and construction of masonry structures. Masonry design methodologies including allowable stress design, strength design and empirical design are covered by the provisions of this chapter. Also addressed are masonry fireplaces and chimneys, masonry heaters and glass unit masonry.

ICC code development note: Code change proposals to this chapter will be considered by the IBC—Structural Code Development Committee during the

2025 (Group B) Code Development Cycle.
California Plumbing Code Medium relevance — show source text

18
38
50
59
69|349
250
242
229
217
206|202
166
160
150
142
134|0
20
47
62
73
84|540
377
367
351
337
322|307
249
241
228
217
206|0
33
62
81
94
107|776
531
519
499
481
464|430
346
337
321
308
295| |30|0
2
5
10
15
20
30|0
9
21
27
33
56
NA|100
81
77
70
64
58
NA|64
56
54
50
NA
NA
NA|0
13
28
37
44
53
73|213
166
160
150
141
132
113|128
112
108
102
96
90
NA|0
14
36
48
57
66
88|374
283
275
262
249
237
214|220
185
176
171
163
154
NA|0
18
45
59
70
80
104|587
432
421
405
389
374
346|336
280
273
261
249
237
219|0
27
58
77
90
102
131|853
613
600
580
560
542
507|475
394
385
371
357
343
321| |50|0
2
5
10
15
20
30|0
8
20
26
59
NA
NA|101
86
82
76
70
NA
NA|67
61
NA
NA
NA
NA
NA|0
11
27
35
42
50
69|216
183
177
168
158
149
131|134
122
119
114
NA
NA
NA|0
14
35
45
54
63
84|397
320
312
299
287
275
250|232
206
200
190
180
169
NA|0
15
43
56
66
76
99|633
497
487
471
455
440
410|363
314
308
298
288
278
259|0
California Plumbing Code Medium relevance — show source text

40
68
88|631
402
392
376|345
273
263
245| |15|0
2
5
10
15|0
11
22
29
35|94
69
65
59
53|58
48
45
41
37|0
15
30
40
48|191
136
130
121
112|112
93
87
82
76|0
20
39
51
61|327
226
219
206
195|187
150
142
135
128|0
22
49
64
76|502
339
330
315
301|285
225
217
208
198|0
38
64
84
98|716
475
463
445
429|390
316
300
288
275| |20|0
2
5
10
15
20|0
10
21
28
34
48|97
75
71
64
58
52|61
51
48
44
40
35|0
14
29
38
46
55|202
149
143
133
124
116|119
100
96
89
84
78|0
18
38
50
59
69|349
250
242
229
217
206|202
166
160
150
142
134|0
20
47
62
73
84|540
377
367
351
337
322|307
249
241
228
217
206|0
33
62
81
94
107|776
531
519
499
481
464|430
346
337
321
308
295| |30|0
2
5
10
15
20
30|0
9
21
27
33
56
NA|100
81
77
70
64
58
NA|64
56
54
50
NA
NA
NA|0
13
28
37
44
53
73|213
166
160
150
141
132
113|128
112
108
102
96
90
NA|0
14
36
48
57
66
88|374
283
275
262
249
237
214|220
185
176
171
163
154
NA|0

CPC § 25.4 Medium relevance — show source text

86
151
196
222
244
287|4934
3409
3380
3332
3285
3239
3150|2550
2125
2102
2064
2026
1987
1910| |100|0
2
5
10
15
20
30
50|0
21
60
80
93
105
131
197|1411
1155
1141
1118
1095
1073
1029
944|770
700
692
679
666
653
627
575|0
25
71
94
109
122
149
217|1908
1536
1519
1492
1465
1438
1387
1288|1040
935
926
910
895
880
849
787|0
30
82
108
126
141
170
241|2491
1975
1955
1923
1892
1861
1802
1688|1310
1170
1159
1142
1124
1107
1071
1000|0
44
107
142
163
181
215
292|3925
3027
3002
2961
2920
2880
2803
2657|2050
1820
1803
1775
1747
1719
1663
1550|0
72
136
180
206
226
265
350|5729
4313
4282
4231
4182
4133
4037
3856|2950
2550
2531
2500
2469
2438
2375
2250|

For SI units: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1000 British thermal units per hour = 0.293 kW, 1 square inch = 0.000645 m [2]

2025 CALIFORNIA PLUMBING CODE 111

WATER HEATERS

TABLE 510.1.2(1) TYPE B DOUBLE-WALL GAS VENT [NFPA 54: TABLE 13.1(a)] (continued)

Col1	Col2	Col3	Col4	Col5	NUMBER OF APPLIANCES:	Col7	Col8	Col9	Col10	Col11	SINGLE	Col13	Col14	Col15	Col16	Col17
					APPLIANCE TYPE:	APPLIANCE TYPE:	APPLIANCE TYPE:	APPLIANCE TYPE:	**APPLIANCE

CPC § 2025 Medium relevance — show source text
Gas Piping| |13|Health Care Facilities and Medical Gas and Medical Vacuum Systems| |14|Firestop Protection| |15|Alternate Water Sources for Nonpotable Applications| |16|Nonpotable Rainwater Catchment Systems| |17|Referenced Standards| |Appendix A|Recommended Rules for Sizing the Water Supply System| |Appendix B|Explanatory Notes on Combination Waste and Vent Systems| |Appendix C|Alternate Plumbing Systems| |Appendix D|Sizing Storm Water Drainage Systems| |Appendix E|Manufactured/Mobile Home Parks and Recreational Vehicle Parks| |Appendix F|Firefighter Breathing Air Replenishment Systems| |Appendix G|Sizing of Venting Systems| |Appendix H|Private Sewage Disposal Systems| |Appendix I|Installation Standards| |Appendix J|Combination of Indoor and Outdoor Combustion and Ventilation Opening Design| |Appendix K|Potable Rainwater Catchment Systems| |Appendix L|Sustainable Practices| |Appendix M|Peak Water Demand Calculator| |Appendix N|Impact of Water Temperature on the Potential for Scalding and Legionella Growth| |Appendix O|Non-Sewered Sanitation Systems| |Appendix P|Professional Qualifications| |Appendix Q|Indoor Horticultural Facilities| |Appendix R|Tiny Houses| |Appendix S|Onsite Stormwater Treatment Systems|

2025 CALIFORNIA PLUMBING CODE xiii

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

FORMAT OF THE UNIFORM PLUMBING CODE

The following is a summary of the scope and intent of the provisions addressed within the chapters and appendices of the Uniform Plumbing Code :

Chapter 1 Administration.

Chapter 1 regulates the application, enforcement, and administration of subsequent requirements of the code. As well as establishing the scope of the code, this chapter is concerned with enforcing the requirements contained in the body of the code. A plumbing code, as with any other code, is intended to be adopted as a legally enforceable document to safeguard health, safety, property, and public welfare. The code cannot be effective without satisfactory provisions for its administration and enforcement. The Authority Having Jurisdiction is to review the proposed and completed work and to decide whether a plumbing system conforms to the code requirements. As a public servant, the Authority Having Jurisdiction enforces the code in an unbiased, proper manner. The design professional is responsible for the design of a safe plumbing system. The contractor is responsible for installing the system in accordance with the plans.

Chapter 2 Definitions.

To maintain consistency and encourage the use of common terminology, Chapter 2 establishes definitions to provide clarity of terms and promote the use of a common language throughout the code. Understanding definitions within the context of their application enables greater collaboration, efficiency, standardization, and interpretation in applying and enforcing terms used throughout the code. Codes are technical documents, and every term can impact the meaning of the code text. Terms not defined have a normally accepted meaning.

Chapter 3 General Regulations.

Chapter 3 regulates the general requirements, not specific to other chapters, for installing plumbing systems. Many regulations are not specific plumbing requirements but relate to the overall plumbing system. This chapter contains safety requirements for installing plumbing and also contains nonplumbing requirements for identifying pipes, pipe fittings, traps, fixtures, materials, and devices used in plumbing systems.

CEC § 202 Medium relevance — show source text

Example:

CHAPTER 2 – DEFINITIONS AND ABBREVIATIONS

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
Adopt entire chapter as amended (amended sections listed below)			X
Adopt only those sections that are listed below								S	A	M	P	L	E
Chapter/Section
202			X

2025 CALIFORNIA BUILDING CODE vii

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

Adopt only those sections that are listed below:

If there is an “X” under a particular state agency’s acronym on this row, it means that particular state agency is adopting only specific model code or state-amended sections within this chapter. There will be an “X” in the column under the agency’s acronym, as well as an “X” by each section that the agency has adopted.

Example:

CHAPTER 2 – DEFINITIONS AND ABBREVIATIONS

CPC § 309.0 Medium relevance — show source text
2025 CALIFORNIA PLUMBING CODE 469

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

IS 33

Uniform Plumbing Code References for Ductile Iron and PVC Pressure Building Supply and Exterior Cold-Water Piping

The following sections of the 2024 Uniform Plumbing Code apply to ductile iron and PVC pressure building supply and exterior cold-water piping.

Chapter 3 General Regulations

309.0 Workmanship

312.0 Protection of Piping, Materials, and Struc tures

313.0 Hangers, Supports, and Anchors

314.0 Trenching, Excavation, and Backfill

Chapter 6 Water Supply and Distribution

604.0 Materials (water piping)

Table 604.1 Materials for Building Supply and Water Distribution Piping and Fittings

605.4 Ductile Iron Pipe and Joints

605.12 PVC Plastic Pipe and Joints

605.16.2 Plastic Pipe to Other Materials

609.0 Installation, Testing, Unions, and Location

Abbreviations

IAPMO International Association of Plumbing and Mechanical Officials

UPC Uniform Plumbing Code published by IAPMO

AWWA American Water Works Association

CSA Canadian Standards Association

Applicable Standards.

ASME B16.4 Gray Iron Threaded Fittings Classes 125 and 250

ASTM D1785 Poly (Vinyl Chloride) (PVC) Plastic Pipe, Schedules 40, 80, and 120

ASTM D2241 Poly (Vinyl Chloride) (PVC) Pressure-Rated Pipe (SDR Series)

ASTM D2466 Poly (Vinyl Chloride) (PVC) Plastic Pipe Fittings, Schedule 40

ASTM D2467 Poly (Vinyl Chloride) (PVC) Plastic Pipe Fittings, Schedule 80

ASTM F1970 Special Engineered Fittings, Appurtenances or Valves for use in Poly (Vinyl Chloride) (PVC) or Chlorinated Poly (Vinyl Chloride) (CPVC) Systems

AWWA C110 Ductile Iron and Gray-Iron Fittings

AWWA C111 Rubber-Gasket Joints for Ductile-Iron Pressure Pipe and Fittings

AWWA C151 Ductile-Iron Pipe, Centrifugally Cast

AWWA C153 Ductile-Iron Compact Fitting

AWWA C900 Polyvinyl Chloride (PVC) Pressure Pipe and Fabricated Fittings, 4 in. through 12 in. (100 mm through 300 mm)

AWWA C904 Crosslinked Polyethylene (PEX) Pressure Tubing, ½ in. through 3 In. (13 mm through 76 mm), for Water Service

AWWA C907 Injection-Molded Polyvinyl Chloride (PVC) Pressure Fittings, 4 In, through 12 in (100 mm through 300 mm) for Water, Wastewater and Reclaimed Water Service

IAPMO/

ANSI UPC-1 Uniform Plumbing Code

470 2025 CALIFORNIA PLUMBING CODE

), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.
California Plumbing Code Medium relevance — show source text

32
50
59|375
232
227
223|205
157
153
149|0
44
66
78|524
321
316
310|285
217
211
205| |8|0
2
5
8|0
12
23
28|84
57
53
49|50
40
38
35|0
16
32
39|165
109
103
98|94
75
71
66|0
25
42
51|276
178
171
164|155
120
115
109|0
28
53
64|415
263
255
247|235
180
173
165|0
42
70
84|583
365
356
347|320
247
237
227| |10|0
2
5
10|0
12
23
30|88
61
57
51|53
42
40
36|0
17
32
41|175
118
113
104|100
81
77
70|0
23
41
54|295
194
187
176|166
129
124
115|0
26
52
67|447
289
280
267|255
195
188
175|0
40
68
88|631
402
392
376|345
273
263
245| |15|0
2
5
10
15|0
11
22
29
35|94
69
65
59
53|58
48
45
41
37|0
15
30
40
48|191
136
130
121
112|112
93
87
82
76|0
20
39
51
61|327
226
219
206
195|187
150
142
135
128|0
22
49
64
76|502
339
330
315
301|285
225
217
208
198|0
38
64
84
98|716
475
463
445
429|390
316
300
288
275| |20|0
2
5
10
15
20|0
10
21
28
34
48|97
75
71
64
58
52|61
51
48
44
40
35|0

CFC § 202 Medium relevance — show source text

Example: CHAPTER 2 – DEFINITIONS AND ABBREVIATIONS

Adopting agency	BSC	BSC- CG	SFM	HCD	Col6	Col7	DSA	Col9	Col10	OSHPD	Col12	Col13	Col14	Col15	Col16	Col17	BSCC	DPH	AGR	DWR	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
Adopt entire chapter
Adopt entire chapter as amended (amended sections listed below)			X
Adopt only those sections that are listed below								S	A	M	P	L	E
Chapter/Section
202			X

2025 CALIFORNIA FIRE CODE vii

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

Adopt only those sections that are listed below:

Example: CHAPTER 2 – DEFINITIONS AND ABBREVIATIONS

California Plumbing Code Medium relevance — show source text
1|57|52|49|46|43| |11⁄2|2|220|205|190|176|155|138|127|120|104|85|70|61|57|54|51| |2|2
|370|327|292|265|217|185|164|147|124|96|70|61|57|54|51| |2|21⁄2|445|418|390|370|330|300|280|265|240|220|198|175|158|143|133| |PRESSURE RANGE – 46 to 60 psi1|PRESSURE RANGE – 46 to 60 psi1|PRESSURE RANGE – 46 to 60 psi1|PRESSURE RANGE – 46 to 60 psi1|PRESSURE RANGE – 46 to 60 psi1|PRESSURE RANGE – 46 to 60 psi1|PRESSURE RANGE – 46 to 60 psi1|PRESSURE RANGE – 46 to 60 psi1|PRESSURE RANGE – 46 to 60 psi1|PRESSURE RANGE – 46 to 60 psi1|PRESSURE RANGE – 46 to 60 psi1|PRESSURE RANGE – 46 to 60 psi1|PRESSURE RANGE – 46 to 60 psi1|PRESSURE RANGE – 46 to 60 psi1|PRESSURE RANGE – 46 to 60 psi1|PRESSURE RANGE – 46 to 60 psi1|PRESSURE RANGE – 46 to 60 psi1| |3⁄4
|1⁄22
|7|7|6|5|4|3|2|2|1|1|1|0|0|0|0| |3⁄4
|3⁄4|20|20|19|17|14|11|9|8|6|5|4|4|3|3|3| |3⁄4|1|39|39|36|33|28|23|21|19|17|14|12|10|9|8|8| |1
|1
|39|39|39|36|30|25|23|20|18|15|12|10|9|8|8| |3⁄4|11⁄4
|39|39|39|39|39|39|34|32|27|25|22|19|19|17|16| |1
|11⁄4
|78|78|76|67|52|44|39|36|30|27|24|20|19|17|16
CPC § 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.
CPC § 140.4 Medium relevance — show source text
4(d), 140.4(e), Table 140.4-G, 140.4(f), 140.4(g), 140.4(h), 140.4(k), 140.4(m), 140.4(n), 140.4(p), 140.4(q), 140.6(a), 141.1(b), 141.1(d), 150.0(h), 150.0(k), 150.0(m), 160.3(a), 160.3(b), 160.3(c), 160.3(d), Table 160.3-D, Table 160.4A, 160.4(f), 160.5(a), 170.2(c), Table 170.2-G, 170.2(d), 170.2(e), 180.2(b)2 Ventilation air Table 120.1-A, 120.1(d), 120.1(h), 130.1(f), 140.9(a), 140.9(c)1, 150.0(o), 150.2(a), 160.2(c), 160.3(d)1, 160.5(b), 170.1(d), 170.2(c), 180.1(b), 180.2(b) Outdoor Air 120.1(c)1 Outdoor Areas Building facade 130.2(b), 160.5(c)1, Table 140.7-B Carport 140.10(a), 150.1(c)14A, 170.2(f), 170.2(g) Hardscape 130.1(c)7, 130.1(d), 130.2(b), 140.7(c), 140.7(d), Table 140.7-A, Table 140.7-B, 141.0(b), 160.5(b), 170.2(e)6, Table 170.2-R, Table 170.2-S, 180.2(b)4 Outdoor sales lot 141.0(b)2L, 180.2(b) Parking lot 140.7(d), 141.0(b)2L, 150.0(k)3, 160.5(c)2, 170.2(e)6 Public monuments 130.2(b), 140.7(a), 160.5(c)1, 170.2(e)6A Outlet 110.3(c), 120.3(a), Table 120.6-C, Table 120.6-E, 120.6(e), 130.5(c), 140.4(p), 150.0(h), 150.0(k), 150.0(m)8, 150.0(o), 150.0(s), 160.2(c), 160.3(b), 160.5(a), 160.6(c) Output Capacity 140.4(g), 150.0(h) Output Wattage 140.8(b)3, 170.2(e) Outside Air 120.1(c), 120.1(d), 120.1(f), 140.4(e)1, 140.4(k), 140.9(a), 141.1(b), 150.0(d), 150.0(m)12, 150.1(c), 160.1(c), 160.2(b)1, 160.2(c), 170.2(c) Outside Air Temperature 140.4(k)4, 140.9(a), 141.1(b), 170.

CPC § 1.859 Medium relevance — show source text

78|–|1.859|0.463| |35.31|–|2.247|0.559| |38.84|–|2.667|0.663| |42.37|–|3.121|0.775| |45.90|–|3.607|0.895| |49.43|–|4.125|1.022| |52.97|–|–|1.157| |56.50|–|–|1.299| |60.03|–|–|1.449| |63.56|–|–|1.607| |67.09|–|–|1.772| |70.62|–|–|1.944| |81.21|–|–|2.503| |91.81|–|–|3.127| |102.40|–|–|3.813|

For SI units: 1 standard cubic foot per minute = 28.32 SLPM, 1 inch = 25 mm, 1 foot = 304.8 mm, 1 pound-force per square inch = 6.8947 kPa

Notes: 1 Based on pressure of 14.7 psig (101 kPa) at 68°F (20°C). 2 Based on pressure of 55 psig (379 kPa) at 68°F (20 °C).

2025 CALIFORNIA PLUMBING CODE 291

HEALTH CARE FACILITIES AND MEDICAL GAS AND MEDICAL VACUUM SYSTEMS

TABLE 1323.1.4(5) PRESSURE LOSS FOR VACUUM (continued)

FLOW RATE (SCFM)1	VACUUM LOSS (inch of mercury) PER 100 FEET FOR COPPER TUBE2	Col3	Col4	Col5	Col6
FLOW RATE (SCFM)1	3⁄4 INCH TUBE	1 INCH TUBE	11⁄4 INCH TUBE	11⁄2 INCH TUBE	2 INCH TUBE
49.43	–	–	–	3.645	0.956
52.97	–	–	–	4.122	1.081
56.50	–	–	–	4.626	1.212
63.56	–	–	–	–	1.495
70.62	–	–	–	–	1.803
77.68	–	–	–	–	2.138
84.74	–	–	–	–	2.497
91.81	–	–	–	–	2.882
98.87	–	–	–	–	3.291
105.93	–	–	–	–	3.724
112.99	–	–	–	–	4.181

California Plumbing Code Medium relevance — show source text

74
127
164
187
207
246|3004
2004
1981
1944
1908
1873
1807|1550
1310
1289
1254
1220
1185
1130|0
98
164
209
237
260
305|4252
2786
2759
2716
2674
2633
2555|2170
1800
1775
1733
1692
1650
1585| |50|0
2
5
10
15
20
30|0
26
65
86
100
113
141|1297
975
960
935
911
888
844|708
615
605
589
572
556
522|0
33
77
101
117
131
161|1730
1276
1259
1230
1203
1176
1125|952
813
798
773
747
722
670|0
41
90
118
136
151
183|2231
1620
1600
1567
1536
1505
1446|1195
1010
996
972
948
924
876|0
66
118
154
177
195
232|3441
2431
2406
2366
2327
2288
2214|1825
1513
1495
1466
1437
1408
1349|0
86
151
196
222
244
287|4934
3409
3380
3332
3285
3239
3150|2550
2125
2102
2064
2026
1987
1910| |100|0
2
5
10
15
20
30
50|0
21
60
80
93
105
131
197|1411
1155
1141
1118
1095
1073
1029
944|770
700
692
679
666
653
627
575|0
25
71
94
109
122
149
217|1908
1536
1519
1492
1465
1438
1387
1288|1040
935
926
910
895
880
849
787|0
30
82
108
126
141
170
241|2491
1975
1955
1923
1892
1861
1802
1688|1310
1170
1159
1142
1124
1107
1071
1000|0
California Plumbing Code Medium relevance — show source text

81
135
172
195
217|2637
1694
1674
1641
1609
1578|1350
1100
1079
1045
1018
990|0
107
174
220
248
273|3701
2343
2320
2282
2245
2210|1900
1520
1498
1460
1425
1390| |30|0
2
5
10
15
20
30|0
33
69
91
105
119
149|1173
826
811
788
765
743
702|650
535
524
507
490
473
444|0
42
82
107
124
139
171|1548
1072
1055
1028
1002
977
929|855
700
688
668
648
628
594|0
54
96
125
143
160
195|1977
1351
1332
1301
1272
1243
1189|1060
865
851
829
807
784
745|0
74
127
164
187
207
246|3004
2004
1981
1944
1908
1873
1807|1550
1310
1289
1254
1220
1185
1130|0
98
164
209
237
260
305|4252
2786
2759
2716
2674
2633
2555|2170
1800
1775
1733
1692
1650
1585| |50|0
2
5
10
15
20
30|0
26
65
86
100
113
141|1297
975
960
935
911
888
844|708
615
605
589
572
556
522|0
33
77
101
117
131
161|1730
1276
1259
1230
1203
1176
1125|952
813
798
773
747
722
670|0
41
90
118
136
151
183|2231
1620
1600
1567
1536
1505
1446|1195
1010
996
972
948
924
876|0

Frequently asked questions

What exactly does “Accepted Engineering Practice” let me do that the prescriptive code does not?

It allows use of alternate materials, designs, or methods that are not prescriptively described in the code so long as they conform to recognized technical principles, standards or tests and (when requested) are documented by a licensed design professional or accepted testing authority — see § 203.0 and the alternate materials procedure in the code.

Is ABS allowed for building sewers?

Yes — ABS (Schedule 40) is listed in the CPC materials table as permitted for underground drain, waste and vent and for building sewer when the product meets the referenced standards (see Table 701.2 and § 203.0). Verify the product meets the ASTM/ASME standards listed in the table.

Where do I find the CPC definition of LP‑Gas?

The CPC cross‑references LIQUEFIED PETROLEUM GAS (LP‑GAS) in the index and points to the fuel‑gas related definitions and requirements (see the CPC index entry referencing § 214.0). For fuel piping and installation rules consult the gas chapters and referenced standards.

If my jurisdiction asks for a stamped engineering report, what standard must that report use?

The code requires that alternates conform to Accepted Engineering Practice (i.e., recognized standards, tests, or principles accepted by the engineering profession). The local building department may specify the scope of the report or the tests required; the CPC allows the authority to require testing or a technical opinion prepared by an acceptable qualified person. See the alternate materials/designs procedure.

You reference § 217.0 — can you quote it?

I located the CPC table of contents / index showing § 217.0 exists (Chapter 2 definitions, “P” section), but the retrieval did not include the full text of § 217.0 in the files I searched. Because the specific wording was not available I have not quoted or relied on it here.

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Related in the CPC

What does 'Accessible' and 'Accessible, Readily' mean in the CPC?

Where are CPC abbreviations and acronyms defined?

Common general definitions (A–G)

California Plumbing Code

Accepted Engineering Practice and material abbreviations (ABS, LP-Gas, etc.)

What the code requires — 2–4 sentences

Requirements in detail

1) Key definitions you must know (first mention bolded)

2) How “Accepted Engineering Practice” is used in the CPC

3) Where common material abbreviations appear and how to apply them

Exceptions & special cases

Common mistakes

Worked example — Concrete scenario applying the rule with numbers

Related provisions (quick reference)

Code references

21 MASONRY

Frequently asked questions

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