Installation details: grades, connections and roof termination

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

• CPC § 901.0 High relevance — show source text

  TABLE OF CONTENTS

  CHAPTER 9 VENTS . . . . . . . . . . . . . . . . . . . . .187

  901.0 General . . . . . . . . . . . . . . . . . . . . .189

  901.1 Applicability . . . . . . . . . . . . . . . . . .189

  901.2 Vents Required . . . . . . . . . . . . . . .189

  901.3 Trap Seal Protection . . . . . . . . . . .189

  902.0 Vents Not Required . . . . . . . . . . .189

  902.1 Interceptor . . . . . . . . . . . . . . . . . .189

  902.2 Bars, Soda Fountains, and Counter . . . . . . . . . . . . . . . . . . . . .189

  903.0 Materials . . . . . . . . . . . . . . . . . . . .189

  903.1 Applicable Standards . . . . . . . . . .189

  903.2 Use of Copper or Copper Alloy Tubing . . . . . . . . . . . . . . . . .189

  903.3 Changes in Direction . . . . . . . . . .189

  904.0 Size of Vents . . . . . . . . . . . . . . . .189

  904.1 Size . . . . . . . . . . . . . . . . . . . . . . . .189

  904.2 Length . . . . . . . . . . . . . . . . . . . . . .189

  905.0 Vent Pipe Grades and Connections . . . . . . . . . . . . . . . . .190

  905.1 Grade . . . . . . . . . . . . . . . . . . . . . .190

  905.2 Horizontal Drainage Pipe . . . . . . .190

  905.3 Vent Pipe Rise . . . . . . . . . . . . . . .190

  905.4 Roof Termination . . . . . . . . . . . . .190

  905.5 Location of Opening . . . . . . . . . . .190

  905.6 Common Vertical Pipe . . . . . . . . .190

  906.0 Vent Termination . . . . . . . . . . . . .190

  906.1 Roof Termination . . . . . . . . . . . . .190

  906.2 Clearance . . . . . . . . . . . . . . . . . . .190

  906.3 Use of Roof . . . . . . . . . . . . . . . . .190

  906.4 Outdoor Installations . . . . . . . . . . .190

  906.5 Joints . . . . . . . . . . . . . . . . . . . . . .190

  906.6 Lead . . . . . . . . . . . . . . . . . . . . . . .190

  906.7 Frost or Snow Closure . . . . . . . . .190

  907.0 Vent Stacks and Relief Vents . . . .190

  907.1 Drainage Stack . . . . . . . . . . . . . . .190

  907.2 Yoke Vent . . . . . . . . . . . . . . . . . . .190

• CPC § 904.2 High relevance — show source text

  904.2 Length. Not more than one-third of the total permitted length, in accordance with Table 703.2, of a minimumsized vent shall be installed in a horizontal position. Where a minimum-sized vent is increased one pipe size for its entire length, the maximum length limitation shall not apply.

  2025 CALIFORNIA PLUMBING CODE 189

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  VENTS

  905.0 Vent Pipe Grades and Connections. 905.1 Grade. Vent and branch vent pipes shall be free from drops or sags, and each such vent shall be level or shall be so graded and connected as to drip back by gravity to the drainage pipe it serves. 905.2 Horizontal Drainage Pipe. Where vents connect to a horizontal drainage pipe, each vent pipe shall have its invert taken off above the drainage centerline of such pipe downstream of the trap being served. 905.3 Vent Pipe Rise. Unless prohibited by structural conditions, each vent shall rise vertically to a point not less than 6 inches (152 mm) above the flood-level rim of the fixture served before offsetting horizontally, and where two or more vent pipes converge, each such vent pipe shall rise to a point not less than 6 inches (152 mm) in height above the floodlevel rim of the plumbing fixture it serves before being connected to any other vent. Vents less than 6 inches (152 mm) above the flood-level rim of the fixture shall be installed with approved drainage fittings, material, and grade to the drain. 905.4 Roof Termination. Vent pipes shall extend undiminished in size above the roof, or shall be reconnected with soil or waste vent of the proper size. 905.5 Location of Opening. The vent pipe opening from soil or waste pipe shall not be below the weir of the trap.

  Exception: Water closets and similar fixtures. 905.6 Common Vertical Pipe. Two fixtures shall be permitted to be served by a common vertical pipe where each such fixture wastes separately into an approved double fitting having inlet openings at the same level.

  906.0 Vent Termination.

  906.1 Roof Termination. Each vent pipe or stack shall extend through its flashing and shall terminate vertically not less than 6 inches (152 mm) above the roof nor less than 1 foot (305 mm) from a vertical surface. ABS and PVC piping exposed to sunlight shall be protected by water based synthetic latex paints.

  906.2 Clearance. Each vent shall terminate not less than 10 feet (3048 mm) from, or not less than 3 feet (914 mm) above, an openable window, door, opening, air intake, or vent shaft, or not less than 3 feet (914 mm) in every direction from a lot line, alley and street excepted. 906.2.1 [OSHPD 1,1R, 2, 3, 4 & 5] Each vent pipe shall terminate not less than twenty-five (25) feet (7620 mm) from any air intake or vent shaft. 906.3 Use of Roof. Vent pipes shall be extended separately or combined, of full required size, not less than 6 inches (152 mm) above the roof or firewall. Flagpoling of vents shall be prohibited except where the roof is used for assembly purposes or parking.

• CPC § 1101.1 Medium relevance — show source text

  1101.1 Applicability . . . . . . . . . . . . . . . . . .205

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

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

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

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

  1101.5 Expansion Joints Required . . . . . .205

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

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

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

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

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

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

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

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

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

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

  1101.16 Leaders, Conductors, and

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

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

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

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

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

  1103.0 Size of Leaders, Conductors,

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

  1103.1 Vertical Conductors and

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

  1103.2 Size of Horizontal Storm

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

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

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

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

  1104.0 Values for Continuous Flow . . . . .208

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

  1105.0 Controlled-Flow Roof

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

• CPC § 905.1 Medium relevance — show source text

  905.1 Grade . . . . . . . . . . . . . . . . . . . . . .190

  905.2 Horizontal Drainage Pipe . . . . . . .190

  905.3 Vent Pipe Rise . . . . . . . . . . . . . . .190

  905.4 Roof Termination . . . . . . . . . . . . .190

  905.5 Location of Opening . . . . . . . . . . .190

  905.6 Common Vertical Pipe . . . . . . . . .190

  906.0 Vent Termination . . . . . . . . . . . . .190

  906.1 Roof Termination . . . . . . . . . . . . .190

  906.2 Clearance . . . . . . . . . . . . . . . . . . .190

  906.3 Use of Roof . . . . . . . . . . . . . . . . .190

  906.4 Outdoor Installations . . . . . . . . . . .190

  906.5 Joints . . . . . . . . . . . . . . . . . . . . . .190

  906.6 Lead . . . . . . . . . . . . . . . . . . . . . . .190

  906.7 Frost or Snow Closure . . . . . . . . .190

  907.0 Vent Stacks and Relief Vents . . . .190

  907.1 Drainage Stack . . . . . . . . . . . . . . .190

  907.2 Yoke Vent . . . . . . . . . . . . . . . . . . .190

  908.0 Wet Venting . . . . . . . . . . . . . . . . .190

  908.1 Vertical Wet Venting . . . . . . . . . . .190

  908.2 Horizontal Wet Venting for a Bathroom Group . . . . . . . . . . . . . .191

  909.0 Special Venting for Island Fixtures . . . . . . . . . . . . . . . . . . . . .191

  909.1 General . . . . . . . . . . . . . . . . . . . . .191

  910.0 Combination Waste and Vent

  Systems . . . . . . . . . . . . . . . . . . . .191

  910.1 Where Permitted . . . . . . . . . . . . . .191

  910.2 Approval . . . . . . . . . . . . . . . . . . . .191

  910.3 Vents . . . . . . . . . . . . . . . . . . . . . .191

  910.4 Connections and Size . . . . . . . . .191

  910.5 Vertical Waste Pipe . . . . . . . . . . .191

  910.6 Cleanouts . . . . . . . . . . . . . . . . . . .191

  910.7 Fixtures . . . . . . . . . . . . . . . . . . . . .191

  911.0 Circuit Venting . . . . . . . . . . . . . . .191

  911.1 Circuit Vent Permitted . . . . . . . . .191

  911.2 Circuit Vent Size and

  Connection . . . . . . . . . . . . . . . . . .192

• CPC § 1101.12.2.2 Medium relevance — show source text

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

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

  206 2025 CALIFORNIA PLUMBING CODE

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  STORM DRAINAGE

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

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

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

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

  leader or conductor before it connects to the horizontal

  drain.

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

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

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

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

  1101.15.3 Method of Installation of Combined Sewer. Individual storm-water traps shall be installed on the stormwater drain branch serving each storm-water inlet, or a single trap shall be installed in the main storm drain just before its connection with the combined building sewer. Such traps shall be provided with an accessible cleanout on the outlet side of the trap.

• CPC § 507.20 Medium relevance — show source text

  507.20 Gas Appliance Pressure Regulators . . . . . . . . . . . . . . . . . . .89

  507.21 Bleed Lines for Diaphragm-Type Valves . . . . . . . . . . . . . . . . . . . . . . .89

  2025 CALIFORNIA PLUMBING CODE xxxi

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  TABLE OF CONTENTS

  507.22 Combination of Appliances and Equipment . . . . . . . . . . . . . . . .90

  507.23 Installation Instructions . . . . . . . . . .90

  507.24 Protection of Outdoor

  Appliances . . . . . . . . . . . . . . . . . . .90

  507.25 Accessibility for Service . . . . . . . . .90

  507.26 Clearance to Combustible

  Materials . . . . . . . . . . . . . . . . . . . . .90

  508.0 Appliances on Roofs, in Attics or Under-Floor Spaces . . . . . . . . . .90

  508.1 General . . . . . . . . . . . . . . . . . . . . . .90

  508.2 Installation of Appliances on Roofs . . . . . . . . . . . . . . . . . . . . .90

  508.3 Appliances on Roofs . . . . . . . . . . .90

  508.4 Appliances in Attics and Under-Floor Spaces . . . . . . . . . . . .91

  509.0 Venting of Appliances . . . . . . . . . . .91

  509.1 Listing . . . . . . . . . . . . . . . . . . . . . . .91

  509.2 Connection to Venting Systems . . .91

  509.3 Minimum Safe Performance . . . . . .91

  509.4 Type of Venting System to be Used . . . . . . . . . . . . . . . . . . . . .92

  Table 509.4 Type of Venting System to be Used . . . . . . . . . . . . . . . . . . .92

  509.5 Masonry, Metal, and Factory-Built Chimneys . . . . . . . . .93

  509.6 Gas Vents . . . . . . . . . . . . . . . . . . . .94

  Table 509.6.1 Roof Slope Heights . . . . . . . . . . . .95

  509.7 Single-Wall Metal Pipe . . . . . . . . . .97

  Table 509.7.3.4(1) Clearances for Connectors . . . . . . .97

  Table 509.7.3.4(2) Reduction of Clearances with Specified Forms of Protection . . . .99

  509.8 Through-the-Wall Vent Termination . . . . . . . . . . . . . . . . . .100

  509.9 Condensation Drain . . . . . . . . . . .100

  509.10 Vent Connectors for

  Category I Appliances . . . . . . . . .100

  Table 509.8.1 Through-the-Wall Direct-Vent Termination Clearances . . . . . . . .101

  Table 509.10.1.3 Minimum Thickness for

• CPC § 0.42. Medium relevance — show source text

  Portions of connections of wood-framed floor systems not noted in the figures shall be in accordance with Section R502, or AWC WFCM, if applicable. Wood framing members shall be of a species having a specific gravity equal to or greater than 0.42. 2. For floor systems of cold-formed steel construction, the provisions of Section R608.9.1 and the prescriptive details of Figures R608.9(5) through R608.9(8), where permitted by the tables accompanying those figures. Portions of connections of coldformed steel-framed floor systems not noted in the figures shall be in accordance with Section R505, or AISI S230, if applicable. 3. Proprietary connectors selected to resist loads and load combinations in accordance with Appendix A (ASD) or Appendix B (LRFD) of PCA 100. 4. An engineered design using loads and load combinations in accordance with Appendix A (ASD) or Appendix B (LRFD) of PCA 100.

  5. An engineered design using loads and material design provisions in accordance with this code, or in accordance with ASCE 7, ACI 318, and AWC NDS for wood-framed construction or AISI S100 for cold-formed steel frame construction.

  R608.9.3 Connections between concrete walls and light-frame ceiling and roof systems. Connections between concrete walls and light-frame ceiling and roof systems shall be in accordance with one of the following:

  1. For ceiling and roof systems of wood-framed construction, the provisions of Section R608.9.1 and the prescriptive details of Figures R608.9(9) and R608.9(10), where permitted by the tables accompanying those figures. Portions of connections of wood-framed ceiling and roof systems not noted in the figures shall be in accordance with Section R802, or AWC WFCM, if applicable. Wood framing members shall be of a species having a specific gravity equal to or greater than 0.42.
  2. For ceiling and roof systems of cold-formed steel construction, the provisions of Section R608.9.1 and the prescriptive details of Figures R608.9(11) and R608.9(12), where permitted by the tables accompanying those figures. Portions of

  2025 CALIFORNIA RESIDENTIAL CODE 6-171

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

  WALL CONSTRUCTION

  connections of cold-formed steel-framed ceiling and roof systems not noted in the figures shall be in accordance with Section R804, or AISI S230, if applicable. 3. Proprietary connectors selected to resist loads and load combinations in accordance with Appendix A (ASD) or Appendix B (LRFD) of PCA 100. 4. An engineered design using loads and load combinations in accordance with Appendix A (ASD) or Appendix B (LRFD) of PCA 100.

  5. An engineered design using loads and material design provisions in accordance with this code, or in accordance with ASCE 7, ACI 318, and AWC NDS for wood-framed construction or AISI S100 for cold-formed steel-framed construction.
• CPC § 1101.16 Medium relevance — show source text

  1101.16 Leaders, Conductors, and Connections. Leaders or conductors shall not be used as soil, waste, or vent pipes nor shall soil, waste, or vent pipes be used as leaders or conductors.

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

  1102.0 Roof Drains.

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

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

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

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

  1103.0 Size of Leaders, Conductors, and Storm Drains.

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

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

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

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

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

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

  2025 CALIFORNIA PLUMBING CODE 207

• CPC § 1101.13.1 Medium relevance — show source text

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

  leader or conductor before it connects to the horizontal

  drain.

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

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

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

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

  1101.15.3 Method of Installation of Combined Sewer. Individual storm-water traps shall be installed on the stormwater drain branch serving each storm-water inlet, or a single trap shall be installed in the main storm drain just before its connection with the combined building sewer. Such traps shall be provided with an accessible cleanout on the outlet side of the trap.

  1101.16 Leaders, Conductors, and Connections. Leaders or conductors shall not be used as soil, waste, or vent pipes nor shall soil, waste, or vent pipes be used as leaders or conductors.

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

  1102.0 Roof Drains.

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

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

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

• CPC § 407.1 Medium relevance — show source text

  SECTION A4.406—ENHANCED DURABILITY AND REDUCED MAINTENANCE (RESERVED)

  SECTION A4.407—WATER RESISTANCE AND MOISTURE MANAGEMENT

  A4.407.1 Drainage around foundations. Install foundation and landscape drains which discharge to a dry well, sump, bioswale or other approved on-site location.

  A4.407.2 Roof drainage. Install gutter and downspout systems to route water at least 5 feet away from the foundation or connect to landscape drains which discharge to a dry well, sump, bioswale, rainwater capture system or other approved on-site location.

  A4.407.3 Flashing details. Provide flashing details on the building plans which comply with accepted industry standards or manufacturer’s instructions. Details are shown on house plans at all of the following locations:

  1. Around windows and doors.

  2. Roof valleys.

  3. Deck connections to the structure.

  4. Roof-to-wall intersections.

  5. Chimneys to roof intersections.

  6. Drip caps above windows and doors with architectural projections.

  Note: Reference details may be found in the Residential Sheet Metal Guidelines published by the Sheet Metal and Air Conditioning Contractors’ National Association Inc.

  A4.407.4 Material protection. Protect building materials delivered to the construction site from rain and other sources of moisture.

  A4.407.5 Ice and water barriers. In Climate Zone 16, an ice and water barrier is installed at valley, eaves and wall to roof intersections. The ice and water barrier shall extend at least 24 inches inside the exterior wall line or as specified by the manufacturer’s installation instructions.

  2025 CALIFORNIA GREEN BUILDING STANDARDS CODE APPENDIX A4-17

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

  APPENDIX A4 — RESIDENTIAL VOLUNTARY MEASURES

  A4.407.6 Door protection. Exterior doors to the dwelling are covered to prevent water intrusion by one or more of the following:

  1. An awning at least 4 feet in depth is installed.

  2. The door is protected by a roof overhang at least 4 feet in depth.

  3. The door is recessed at least 4 feet.

  4. Other methods which provide equivalent protection.

  A4.407.7 Roof overhangs. A permanent overhang or awning at least 2 feet in depth is provided at all exterior walls.

  SECTION A4.408—CONSTRUCTION WASTE REDUCTION, DISPOSAL AND RECYCLING

  A4.408.1 Enhanced construction waste reduction. Nonhazardous construction and demolition debris generated at the site is diverted to recycle or salvage in compliance with one of the following:

  Tier 1. At least a 65 percent reduction. Any mixed recyclables that are sent to mixed-waste recycling facilities shall include a qualified third party verified facility average diversion rate. Verification of diversion rates shall meet minimum certification eligibility guidelines, acceptable to the local enforcing agency.

  Tier 2. At least a 75 percent reduction with a third-party verification as required for Tier 1.

  Exceptions:

  1. Equivalent or alternative waste reduction methods are developed by working with local agencies if diversion or recycle facilities capable of compliance with this item do not exist.
  2. The enforcing agency may make exceptions to the requirements of this section when jobsites are located in areas beyond the haul boundaries of the diversion facility.
• CPC § 10-29 Medium relevance — show source text

  F. Approximately a half pint of ‘‘touch-up’’ paint (preferably in an aerosol spray can) must be included and shipped with each unit (attached inside the unit to the cable support block). 3. Methods of Serving Large Commercial Customers A. Main Service Rating 201 Through 2,500 Amps: The approved method is by underground cable in customer-installed conduit for cable distance 50 feet or less (refer to Document 063928 for details). B. Main Service Rating 3,000 Through 4,000 Amps: The approved method is a PG&E-owned and installed bus duct entrance box attaching to customer-owned and installed bus duct that is a minimum of 36” long.

  4. Note: Bus ducts must only be connected to pad-mounted transformers with a minimum 30-inch deep cabinet and a secondary terminal height of 46 inches from the bottom of the cabinet (Style IIE-LB and IIF, 300 kVA and larger).

  Rev. #12: 10-29-19 063929 Page 1 of 10

  UG-1: Services Greenbook Requirements for Bus Duct Entrance Termination Unit for Use With Pad-Mounted Transformers

  5. It is recommended to install pad-mounted transformer, bus duct entrance termination box, and customer bus duct entrance box on the same monolithic pad to avoid soil settlement issues. See Document 043818 or Document 045292 for transformer pad dimensions.

  6. Service Connection

  The customer must provide a minimum of 36 inches of straight (unbent) bus duct from the bus duct entrance terminating end at the side of the pad-mounted transformer (top entry is not permitted). The customer must also supply tie straps for collecting like phases, all necessary bus extensions, and bracing for bus extensions, as required. The bus duct must enter the transformer entrance box in a ‘‘horizontal’’ configuration. PG&E will make the connections from the bus extensions to the transformer secondary terminals, using insulated, flexible, copper conductor provided by PG&E.

  7. A termination enclosure is allowed if its installation meets the following requirements:

  A. Has the same capacity and short circuit rating as the customer’s switchboard.

  B. Installed at a distance no closer than 60” from the edge of the transformer pad.

  C. Meets Greenbook specifications as listed below:

  • 5.2.1. Approved Metering and Service Termination Equipment.

  • 5.2.2. Drawing Submittal Requirements for Metering and Service Termination Equipment.

  • 9.10. Underground Service Cable−Termination Section or Pull Box.

  • Table 9 − 4 Minimum Pad−Mounted (Floor−Standing) Switchboard Pull−Section Dimensions: Residential and Nonresidential, Single−Phase and Three−Phase.

  • Figure 9 − 15, Detail of Aluminum, Termination Bus Stubs.

  • 10.3.12. Service Terminations for Underground Services.

  • 10.3.14. Underground, Cable−Terminating Facilities in Pull Boxes or Pull Sections.

  8. To provide a water tight transition between the components, the bus duct (flanged ends provided by the customer) must match the dimensions of the transition box assembly and flange plate (Detail A on Page 9).

  9. Transformer Bus Duct Cover Plate

• CPC § 2025 Medium relevance — show source text

  Chapter 7 Sanitary Drainage.

  This chapter regulates the design and installation of sanitary drainage systems to ensure they will work as intended. Drainage piping should not be oversized nor undersized, and constructed of approved materials to guard against fouling, deposit of solids, clogging, and with cleanouts so arranged that the pipes may be readily cleaned. The purpose of the sanitary drainage system is to remove effluent discharged from plumbing fixtures and other equipment to an approved point of disposal, such as a public sanitary system or private sewage disposal system.

  The basics of a sanitary drainage system include public and private sewage disposal; selection of materials; installation of the building drain and sewer; joining methods for pipe and fittings; drainage fixture units for sizing the drainage system; sumps and ejectors; vent sizing and length of vents; and testing.

  Chapter 8 Indirect Wastes.

  Chapter 8 regulates indirect waste connections that are required for plumbing fixtures and plumbing appliances dealing with food preparation, dishwashing, potable liquids, and similar equipment. An indirect connection prevents sewage from backing up into a fixture or appliance, thus providing protection against potential health hazards. The waste pipe discharges through an air gap or air break into a waste receptor or standpipe. The protection in the form of an air gap is necessary when the contamination is a potential health hazard or cross connection with the potable water system. Where there is no possibility of contaminating the potable water (nonpotable discharge), the indirect waste pipe may connect in the form of an air break. This method is often preferred to prevent splashing. In addition, health care facilities and special wastes must be protected from contamination that may result from the connection to the drainage system. The waste must be treated to prevent any damage to the piping or sewage treatment process. Waste receptors are sized and designed to prevent splashing and allow for peak discharge conditions.

  Chapter 9 Vents.

  Chapter 9 regulates the material, design, and installation of vents. A vent system is a pipe or pipes installed in a drainage system that provide a flow of air to and from the system to ventilate it, provide a circulation of air to eliminate trap siphonage, and reduce back-pressure and vacuum surge. In addition, vents provide the rapid and silent flow of waste without exposing occupants of the building to any sewer gases. Proper installation of vents is crucial, as a telltale sign that there is a problem in the drain and vent system is related to the elevation of the horizontal portion of the venting. Venting is not limited to sanitary drainage systems. Venting methods are applicable to other drainage systems such as those for chemical waste, graywater waste, and clear water waste. Sizing the venting system is directly tied to the design of the drainage system. For example, the velocities in the drainage system and its peak flow rates affect the diameters in the venting system. Where the vertical distance between a fixture outlet and trap is excessive, velocities in the entire drainage system will be greater than those in the vent sizing table. All venting methods in this chapter are categorized as either dry vents or wet vents. Vent stacks, stack vents, branch vents, island vents, relief vents, and individual vents are dry vents. Wet vents (horizontal or vertical), circuit vents, combination drain and vents are versions of “wet venting” in which the vent is wetted by drainage flow.

  2025 CALIFORNIA PLUMBING CODE xv