Which interior finish materials are permitted (tile, paneling, wood veneer, etc.) and their references?

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

• CRC § 3.1 High relevance — show source text

  R-3.1_|C|C|C|C|C|C| |S|C|C|C|B|B|C| |U|No restrictions|No restrictions|No restrictions|No restrictions|No restrictions|No restrictions| |For SI: 1 inch = 25.4 mm, 1 square foot = 0.0929 m2.
  NP = Not permitted_ [SFM]_
  a. Class C interior finish materials shall be permitted for wainscotting or paneling of not more than 1,000 square feet of applied surface area in the grade lobby where applied
  directly to a noncombustible base or over furring strips applied to a noncombustible base and fireblocked as required by Section 803.15.1.
  b. In other than Group I-3 occupancies in buildings less than three stories above grade plane, Class B interior finish for nonsprinklered buildings and Class C interior finish for
  sprinklered buildings shall be permitted in interior exit stairways and ramps.
  c. Requirements for rooms and enclosed spaces shall be based on spaces enclosed by partitions. Where a fire-resistance rating is required for structural elements, the enclosing
  partitions shall extend from the floor to the ceiling. Partitions that do not comply with this shall be considered to be enclosing spaces and the rooms or spaces on both sides
  shall be considered to be one room or space. In determining the applicable requirements for rooms and enclosed spaces, the specific occupancy thereof shall be the govern-
  ing factor regardless of the group classification of the building or structure.
  d. Lobby areas in Group A-1, A-2 and A-3 occupancies shall be not less than Class B materials.
  e. Class C interior finish materials shall be permitted in places of assembly with an occupant load of 300 persons or less.
  f. For places of religious worship, wood used for ornamental purposes, trusses, paneling or chancel furnishing shall be permitted.
  g. Class B material is required where the building exceeds two stories.
  h. Class C interior finish materials shall be permitted in administrative spaces.
  i. Class C interior finish materials shall be permitted in rooms with a capacity of four persons or less.
  j. Class B materials shall be permitted as wainscotting extending not more than 48 inches above the finished floor in corridors and exit access stairways and ramps.
  k. Finish materials as provided for in other sections of this code.
  l. Applies when protected by an automatic sprinkler system installed in accordance with Section 903.3.1.1 or 903.3.1.2.
  m.Corridors in ambulatory care facilities shall be provided with Class A or B materials.
  n. Where Group R-3 and R-4 occupancies are permitted in Section 903.2.8 to be protected by an automatic sprinkler system installed in accordance with Section 903.3.1.3, the
  requirements for a non-sprinklered building shall apply.
  o. Where patients are restrained in psychiatric treatment areas of Group I-2, finishes shall comply with the requirements of a Group I-3.|For SI: 1 inch = 25.4 mm, 1 square foot = 0.0929 m2.
  NP = Not permitted_ [SFM]_
  a.

• CRC § 7.2 High relevance — show source text

  7|||||||||||||||||||||||| |Table R702.7 (3)||||†|||||||||||||||||||| |R702.7.2||||||||||||||||||||X|||| |Table_R702.7.3_||||||||||||||||||||X||||

  The state agency does not adopt sections identified with the following symbol: †

  2025 CALIFORNIA RESIDENTIAL CODE 7-1

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

  7-2 2025 CALIFORNIA RESIDENTIAL CODE

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

  7 WALL COVERING

  User notes:

  About this chapter: Chapter 7 establishes the various types of materials, materials standards and methods of application permitted as interior and exterior wall coverings. Interior coverings include interior plaster, gypsum board, ceramic tile, wood veneer paneling, hardboard paneling, wood shakes and wood shingles. Exterior wall coverings regulated by this section include aluminum, stone and masonry veneer, wood, hardboard, particleboard, wood structural panel siding, wood shakes and shingles, exterior plaster, steel, vinyl, fiber cement and exterior insulation finish systems. This chapter also contains requirements for the use of vapor retarders for moisture control in walls; wind resistance and water-resistive barriers for exterior wall coverings; and the water-resistive barrier required beneath exterior materials.

  SECTION R701—GENERAL

  R701.1 Application. The provisions of this chapter shall control the design and construction of the interior and exterior wall covering for buildings.

  R701.2 Installation. Products sensitive to adverse weather shall not be installed until adequate weather protection for the installation is provided. Exterior sheathing shall be dry before applying exterior cover.

  SECTION R702—INTERIOR COVERING

  R702.1 General. Interior coverings or wall finishes shall be installed in accordance with this chapter and Tables R702.1(1), R702.1(2), R702.1(3) and R702.3.5. Interior masonry veneer shall comply with the requirements of Section R703.7.1 for support and Section R703.7.4 for anchorage, except an airspace is not required. Interior finishes and materials shall conform to the flame spread and smoke-development requirements of Section R302.9.

  **

  TABLE R702.1(1)—THICKNESS OF PLASTER	Col2	Col3
  ** PLASTER BASE**	** FINISHED THICKNESS OF PLASTER FROM FACE OF LATH, MASONRY, CONCRETE** (inches)	** FINISHED THICKNESS OF PLASTER FROM FACE OF LATH, MASONRY, CONCRETE** (inches)
  ** PLASTER BASE**	** Gypsum Plaster**	** Cement Plaster**
  Expanded metal lath	5/8, minimuma	5/8, minimuma
  Wire lath	5/8, minimuma	3/4, minimum (interior)b
  Wire lath	5/8, minimuma	7/8, minimum (exterior)b
  Gypsum lathg	1/2, minimum	3/4, minimum (interior)b
  Masonry wallsc	1/2, minimum	1/2, minimum
  Monolithic concrete wallsc, d	5/8, maximum	7/8, maximum
  Monolithic concrete ceilingsc, d	3/8,

• CRC § 803.15.1. High relevance — show source text

  Class C interior finish materials shall be permitted for wainscotting or paneling of not more than 1,000 square feet of applied surface area in the grade lobby where applied
  directly to a noncombustible base or over furring strips applied to a noncombustible base and fireblocked as required by Section 803.15.1.
  b. In other than Group I-3 occupancies in buildings less than three stories above grade plane, Class B interior finish for nonsprinklered buildings and Class C interior finish for
  sprinklered buildings shall be permitted in interior exit stairways and ramps.
  c. Requirements for rooms and enclosed spaces shall be based on spaces enclosed by partitions. Where a fire-resistance rating is required for structural elements, the enclosing
  partitions shall extend from the floor to the ceiling. Partitions that do not comply with this shall be considered to be enclosing spaces and the rooms or spaces on both sides
  shall be considered to be one room or space. In determining the applicable requirements for rooms and enclosed spaces, the specific occupancy thereof shall be the govern-
  ing factor regardless of the group classification of the building or structure.
  d. Lobby areas in Group A-1, A-2 and A-3 occupancies shall be not less than Class B materials.
  e. Class C interior finish materials shall be permitted in places of assembly with an occupant load of 300 persons or less.
  f. For places of religious worship, wood used for ornamental purposes, trusses, paneling or chancel furnishing shall be permitted.
  g. Class B material is required where the building exceeds two stories.
  h. Class C interior finish materials shall be permitted in administrative spaces.
  i. Class C interior finish materials shall be permitted in rooms with a capacity of four persons or less.
  j. Class B materials shall be permitted as wainscotting extending not more than 48 inches above the finished floor in corridors and exit access stairways and ramps.
  k. Finish materials as provided for in other sections of this code.
  l. Applies when protected by an automatic sprinkler system installed in accordance with Section 903.3.1.1 or 903.3.1.2.
  m.Corridors in ambulatory care facilities shall be provided with Class A or B materials.
  n. Where Group R-3 and R-4 occupancies are permitted in Section 903.2.8 to be protected by an automatic sprinkler system installed in accordance with Section 903.3.1.3, the
  requirements for a non-sprinklered building shall apply.
  o. Where patients are restrained in psychiatric treatment areas of Group I-2, finishes shall comply with the requirements of a Group I-3.|For SI: 1 inch = 25.4 mm, 1 square foot = 0.0929 m2.
  NP = Not permitted_ [SFM]_
  a. Class C interior finish materials shall be permitted for wainscotting or paneling of not more than 1,000 square feet of applied surface area in the grade lobby where applied
  directly to a noncombustible base or over furring strips applied to a noncombustible base and fireblocked as required by Section 803.15.1.
  b. In other than Group I-3 occupancies in buildings less than three stories above grade plane, Class B interior finish for nonsprinklered buildings and Class C interior finish for
  sprinklered buildings shall be permitted in interior exit stairways and ramps.
  c.

• CRC § 903.3.1.1 High relevance — show source text

  Lobby areas in Group A-1, A-2 and A-3 occupancies shall be not less than Class B materials.
  e. Class C interior finish materials shall be permitted in places of assembly with an occupant load of 300 persons or less.
  f. For places of religious worship, wood used for ornamental purposes, trusses, paneling or chancel furnishing shall be permitted.
  g. Class B material is required where the building exceeds two stories.
  h. Class C interior finish materials shall be permitted in administrative spaces.
  i. Class C interior finish materials shall be permitted in rooms with a capacity of four persons or less.
  j. Class B materials shall be permitted as wainscotting extending not more than 48 inches above the finished floor in corridors and exit access stairways and ramps.
  k. Finish materials as provided for in other sections of this code.
  l. Applies when protected by an automatic sprinkler system installed in accordance with Section 903.3.1.1 or 903.3.1.2.
  m.Corridors in ambulatory care facilities shall be provided with Class A or B materials.
  n. Where Group R-3 and R-4 occupancies are permitted in Section 903.2.8 to be protected by an automatic sprinkler system installed in accordance with Section 903.3.1.3, the
  requirements for a non-sprinklered building shall apply.
  o. Where patients are restrained in psychiatric treatment areas of Group I-2, finishes shall comply with the requirements of a Group I-3.|For SI: 1 inch = 25.4 mm, 1 square foot = 0.0929 m2.
  NP = Not permitted_ [SFM]_
  a. Class C interior finish materials shall be permitted for wainscotting or paneling of not more than 1,000 square feet of applied surface area in the grade lobby where applied
  directly to a noncombustible base or over furring strips applied to a noncombustible base and fireblocked as required by Section 803.15.1.
  b. In other than Group I-3 occupancies in buildings less than three stories above grade plane, Class B interior finish for nonsprinklered buildings and Class C interior finish for
  sprinklered buildings shall be permitted in interior exit stairways and ramps.
  c. Requirements for rooms and enclosed spaces shall be based on spaces enclosed by partitions. Where a fire-resistance rating is required for structural elements, the enclosing
  partitions shall extend from the floor to the ceiling. Partitions that do not comply with this shall be considered to be enclosing spaces and the rooms or spaces on both sides
  shall be considered to be one room or space. In determining the applicable requirements for rooms and enclosed spaces, the specific occupancy thereof shall be the govern-
  ing factor regardless of the group classification of the building or structure.
  d. Lobby areas in Group A-1, A-2 and A-3 occupancies shall be not less than Class B materials.
  e. Class C interior finish materials shall be permitted in places of assembly with an occupant load of 300 persons or less.
  f. For places of religious worship, wood used for ornamental purposes, trusses, paneling or chancel furnishing shall be permitted.
  g. Class B material is required where the building exceeds two stories.
  h. Class C interior finish materials shall be permitted in administrative spaces.
  i.

• CRC § 903.2.8 High relevance — show source text

  Where Group R-3 and R-4 occupancies are permitted in Section 903.2.8 to be protected by an automatic sprinkler system installed in accordance with Section 903.3.1.3, the_
  requirements for a non-sprinklered building shall apply.
  o. Where patients are restrained in psychiatric treatment areas of Group I-2, finishes shall comply with the requirements of a Group I-3.|For SI: 1 inch = 25.4 mm, 1 square foot = 0.0929 m2.
  NP = Not permitted_ [SFM]_
  a. Class C interior finish materials shall be permitted for wainscotting or paneling of not more than 1,000 square feet of applied surface area in the grade lobby where applied
  directly to a noncombustible base or over furring strips applied to a noncombustible base and fireblocked as required by Section 803.15.1.
  b. In other than Group I-3 occupancies in buildings less than three stories above grade plane, Class B interior finish for nonsprinklered buildings and Class C interior finish for
  sprinklered buildings shall be permitted in interior exit stairways and ramps.
  c. Requirements for rooms and enclosed spaces shall be based on spaces enclosed by partitions. Where a fire-resistance rating is required for structural elements, the enclosing
  partitions shall extend from the floor to the ceiling. Partitions that do not comply with this shall be considered to be enclosing spaces and the rooms or spaces on both sides
  shall be considered to be one room or space. In determining the applicable requirements for rooms and enclosed spaces, the specific occupancy thereof shall be the govern-
  ing factor regardless of the group classification of the building or structure.
  d. Lobby areas in Group A-1, A-2 and A-3 occupancies shall be not less than Class B materials.
  e. Class C interior finish materials shall be permitted in places of assembly with an occupant load of 300 persons or less.
  f. For places of religious worship, wood used for ornamental purposes, trusses, paneling or chancel furnishing shall be permitted.
  g. Class B material is required where the building exceeds two stories.
  h. Class C interior finish materials shall be permitted in administrative spaces.
  i. Class C interior finish materials shall be permitted in rooms with a capacity of four persons or less.
  j. Class B materials shall be permitted as wainscotting extending not more than 48 inches above the finished floor in corridors and exit access stairways and ramps.
  k. Finish materials as provided for in other sections of this code.
  l. Applies when protected by an automatic sprinkler system installed in accordance with Section 903.3.1.1 or 903.3.1.2.
  m.Corridors in ambulatory care facilities shall be provided with Class A or B materials.
  n. Where Group R-3 and R-4 occupancies are permitted in Section 903.2.8 to be protected by an automatic sprinkler system installed in accordance with Section 903.3.1.3, the
  requirements for a non-sprinklered building shall apply.
  o. Where patients are restrained in psychiatric treatment areas of Group I-2, finishes shall comply with the requirements of a Group I-3.|For SI: 1 inch = 25.4 mm, 1 square foot = 0.0929 m2.
  NP = Not permitted_ [SFM]_
  a.

• CRC § 903.3.1.1 High relevance — show source text

  Requirements for rooms and enclosed spaces shall be based on spaces enclosed by partitions. Where a fire-resistance rating is required for structural elements, the enclosing
  partitions shall extend from the floor to the ceiling. Partitions that do not comply with this shall be considered to be enclosing spaces and the rooms or spaces on both sides
  shall be considered to be one room or space. In determining the applicable requirements for rooms and enclosed spaces, the specific occupancy thereof shall be the govern-
  ing factor regardless of the group classification of the building or structure.
  d. Lobby areas in Group A-1, A-2 and A-3 occupancies shall be not less than Class B materials.
  e. Class C interior finish materials shall be permitted in places of assembly with an occupant load of 300 persons or less.
  f. For places of religious worship, wood used for ornamental purposes, trusses, paneling or chancel furnishing shall be permitted.
  g. Class B material is required where the building exceeds two stories.
  h. Class C interior finish materials shall be permitted in administrative spaces.
  i. Class C interior finish materials shall be permitted in rooms with a capacity of four persons or less.
  j. Class B materials shall be permitted as wainscotting extending not more than 48 inches above the finished floor in corridors and exit access stairways and ramps.
  k. Finish materials as provided for in other sections of this code.
  l. Applies when protected by an automatic sprinkler system installed in accordance with Section 903.3.1.1 or 903.3.1.2.
  m.Corridors in ambulatory care facilities shall be provided with Class A or B materials.
  n. Where Group R-3 and R-4 occupancies are permitted in Section 903.2.8 to be protected by an automatic sprinkler system installed in accordance with Section 903.3.1.3, the
  requirements for a non-sprinklered building shall apply.
  o. Where patients are restrained in psychiatric treatment areas of Group I-2, finishes shall comply with the requirements of a Group I-3.|For SI: 1 inch = 25.4 mm, 1 square foot = 0.0929 m2.
  NP = Not permitted_ [SFM]_
  a. Class C interior finish materials shall be permitted for wainscotting or paneling of not more than 1,000 square feet of applied surface area in the grade lobby where applied
  directly to a noncombustible base or over furring strips applied to a noncombustible base and fireblocked as required by Section 803.15.1.
  b. In other than Group I-3 occupancies in buildings less than three stories above grade plane, Class B interior finish for nonsprinklered buildings and Class C interior finish for
  sprinklered buildings shall be permitted in interior exit stairways and ramps.
  c. Requirements for rooms and enclosed spaces shall be based on spaces enclosed by partitions. Where a fire-resistance rating is required for structural elements, the enclosing
  partitions shall extend from the floor to the ceiling. Partitions that do not comply with this shall be considered to be enclosing spaces and the rooms or spaces on both sides
  shall be considered to be one room or space. In determining the applicable requirements for rooms and enclosed spaces, the specific occupancy thereof shall be the govern-
  ing factor regardless of the group classification of the building or structure.
  d.

• CRC § 903.3.1.1 High relevance — show source text

  Class B materials shall be permitted as wainscotting extending not more than 48 inches above the finished floor in corridors and exit access stairways and ramps.
  k. Finish materials as provided for in other sections of this code.
  l. Applies when protected by an automatic sprinkler system installed in accordance with Section 903.3.1.1 or 903.3.1.2.
  m.Corridors in ambulatory care facilities shall be provided with Class A or B materials.
  n. Where Group R-3 and R-4 occupancies are permitted in Section 903.2.8 to be protected by an automatic sprinkler system installed in accordance with Section 903.3.1.3, the
  requirements for a non-sprinklered building shall apply.
  o. Where patients are restrained in psychiatric treatment areas of Group I-2, finishes shall comply with the requirements of a Group I-3.|For SI: 1 inch = 25.4 mm, 1 square foot = 0.0929 m2.
  NP = Not permitted_ [SFM]_
  a. Class C interior finish materials shall be permitted for wainscotting or paneling of not more than 1,000 square feet of applied surface area in the grade lobby where applied
  directly to a noncombustible base or over furring strips applied to a noncombustible base and fireblocked as required by Section 803.15.1.
  b. In other than Group I-3 occupancies in buildings less than three stories above grade plane, Class B interior finish for nonsprinklered buildings and Class C interior finish for
  sprinklered buildings shall be permitted in interior exit stairways and ramps.
  c. Requirements for rooms and enclosed spaces shall be based on spaces enclosed by partitions. Where a fire-resistance rating is required for structural elements, the enclosing
  partitions shall extend from the floor to the ceiling. Partitions that do not comply with this shall be considered to be enclosing spaces and the rooms or spaces on both sides
  shall be considered to be one room or space. In determining the applicable requirements for rooms and enclosed spaces, the specific occupancy thereof shall be the govern-
  ing factor regardless of the group classification of the building or structure.
  d. Lobby areas in Group A-1, A-2 and A-3 occupancies shall be not less than Class B materials.
  e. Class C interior finish materials shall be permitted in places of assembly with an occupant load of 300 persons or less.
  f. For places of religious worship, wood used for ornamental purposes, trusses, paneling or chancel furnishing shall be permitted.
  g. Class B material is required where the building exceeds two stories.
  h. Class C interior finish materials shall be permitted in administrative spaces.
  i. Class C interior finish materials shall be permitted in rooms with a capacity of four persons or less.
  j. Class B materials shall be permitted as wainscotting extending not more than 48 inches above the finished floor in corridors and exit access stairways and ramps.
  k. Finish materials as provided for in other sections of this code.
  l. Applies when protected by an automatic sprinkler system installed in accordance with Section 903.3.1.1 or 903.3.1.2.
  m.Corridors in ambulatory care facilities shall be provided with Class A or B materials.
  _n.

• CRC § 2025 High relevance — show source text

  The prescriptive provisions of this chapter provide requirements for constructing footings and walls for foundations of wood, masonry, concrete and precast concrete. In addition to a foundation’s ability to support the required design loads, this chapter addresses several other factors that can affect foundation performance. These include controlling surface water and subsurface drainage, requiring soil tests where conditions warrant and evaluating proximity to slopes and minimum depth requirements. The chapter also provides requirements to minimize adverse effects of moisture, decay and pests in basements and crawl spaces.

  Chapter 5 Floors.

  Chapter 5 provides the requirements for the design and construction of floor systems that will be capable of supporting minimum required design loads. This chapter covers four different types: wood floor framing, wood floors on the ground, cold-formed steel floor framing and concrete slabs on the ground. Allowable span tables are provided that greatly simplify the determination of joist, girder and sheathing sizes for raised floor systems of wood framing and cold-formed steel framing. This chapter also contains prescriptive requirements for wood-framed exterior decks and their attachment to the main building.

  Chapter 6 Wall Construction.

  Chapter 6 contains provisions that regulate the design and construction of walls. The wall construction covered in Chapter 6 consists of five different types: wood framed, cold-formed steel framed, masonry, concrete and structural insulated panel (SIP). The primary concern of this chapter is the structural integrity of wall construction and transfer of all imposed loads to the supporting structure. This chapter provides the requirements for the design and construction of wall systems that are capable of supporting the minimum design vertical loads (dead, live and snow loads) and lateral loads (wind or seismic loads). This chapter contains the prescriptive requirements for wall bracing and/or shear walls to resist the imposed lateral loads due to wind and seismic activity.

  Chapter 6 also regulates exterior windows and doors installed in walls. This chapter contains criteria for the performance of exterior windows and doors and includes provisions for testing and labeling, garage doors, windborne debris protection and anchorage details.

  Chapter 7 Wall Covering.

  Chapter 7 contains provisions for the design and construction of interior and exterior wall coverings. This chapter establishes the various types of materials, materials standards and methods of application permitted for use as interior coverings, including interior plaster, gypsum board, ceramic tile, wood veneer paneling, hardboard paneling, wood shakes and wood shingles. Chapter 7 also contains requirements for the use of vapor retarders for moisture control in walls.

  2025 CALIFORNIA RESIDENTIAL CODE xv

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

  Exterior wall coverings provide the weather-resistant exterior envelope that protects the building’s interior from the elements. Chapter 7 provides the requirements for wind resistance and water-resistive barrier for exterior wall coverings. This chapter prescribes the exterior wall coverings as well as the water-resistive barrier required beneath the exterior materials. Exterior wall coverings regulated by this section include aluminum, stone and masonry veneer, wood, hardboard, particleboard, wood structural panel siding, wood shakes and shingles, exterior plaster, steel, vinyl, fiber cement and exterior insulation finish systems.

  Chapter 8 Roof-Ceiling Construction.

• CRC § 3.7 High relevance — show source text

  Values shall be reduced 50 percent in Seismic Design Categories D0, D1, D2 and E.
  c. 11/4-inch, No. 6 Type S or W screws shall be permitted to be substituted for the listed nails.
  d. Fasteners shall be spaced not more than 7 inches on center at all supports, including perimeter blocking, and not less than3/8 inch from the edges and ends of the gypsum
  board.|

  R702.3.7 Water-resistant gypsum backing board. Gypsum board used as the base or backer for adhesive application of ceramic tile or other required nonabsorbent finish material shall conform to ASTM C1178, C1278 or C1396. Use of water-resistant gypsum backing board shall be permitted on ceilings. Water-resistant gypsum board shall not be installed over a Class I or II vapor retarder in a shower or tub compartment. Cut or exposed edges, including those at wall intersections, shall be sealed as recommended by the manufacturer.

  R702.3.7.1 Limitations. Water-resistant gypsum backing board shall not be used where there will be direct exposure to water, or in areas subject to continuous high humidity.

  R702.4 Ceramic tile.

  R702.4.1 General. Ceramic tile surfaces shall be installed in accordance with ANSI A108.1, A108.4, A108.5, A108.6, A108.11, A118.1, A118.3, A136.1 and A137.1.

  R702.4.2 Backer boards. Materials used as backers for wall tile in tub and shower areas and wall panels in shower areas shall be of materials listed in Table R702.4.2, and installed in accordance with the manufacturer’s recommendations.

  TABLE R702.4.2—BACKER BOARD MATERIALS	Col2
  ** MATERIAL**	** STANDARD**
  Glass mat gypsum backing panel	ASTM C1178
  Fiber-reinforced gypsum panels	ASTM C1278
  Nonasbestos fiber-cement backer board	ASTM C1288 or ISO 8336, Category C
  Nonasbestos fiber mat-reinforced cementitious backer units	ASTM C1325

  R702.5 Other finishes. Wood veneer paneling and hardboard paneling shall be placed on wood or cold-formed steel framing spaced not more than 16 inches (406 mm) on center. Wood veneer and hard board paneling less than [1] / 4 -inch (6 mm) nominal thickness shall not have less than a [3] / 8 -inch (10 mm) gypsum board or gypsum panel product backer. Wood veneer paneling not less than [1] / 4 -inch (6 mm) nominal thickness shall conform to ANSI/HPVA HP-1. Hardboard paneling shall conform to CPA/ANSI A135.5.

  R702.6 Wood shakes and shingles. Wood shakes and shingles shall conform to CSSB Grading Rules for Wood Shakes and Shingles and shall be permitted to be installed directly to the studs with maximum 24 inches (610 mm) on-center spacing.

  R702.6.1 Attachment. Nails, staples or glue are permitted for attaching shakes or shingles to the wall, and attachment of the shakes or shingles directly to the surface shall be permitted provided the fasteners are appropriate for the type of wall surface material. Where nails or staples are used, two fasteners shall be provided and shall be placed so that they are covered by the course above.

• CRC § 2025 High relevance — show source text

  Chapter 6 also regulates exterior windows and doors installed in walls. This chapter contains criteria for the performance of exterior windows and doors and includes provisions for testing and labeling, garage doors, windborne debris protection and anchorage details.

  Chapter 7 Wall Covering.

  Chapter 7 contains provisions for the design and construction of interior and exterior wall coverings. This chapter establishes the various types of materials, materials standards and methods of application permitted for use as interior coverings, including interior plaster, gypsum board, ceramic tile, wood veneer paneling, hardboard paneling, wood shakes and wood shingles. Chapter 7 also contains requirements for the use of vapor retarders for moisture control in walls.

  2025 CALIFORNIA RESIDENTIAL CODE xv

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

  Exterior wall coverings provide the weather-resistant exterior envelope that protects the building’s interior from the elements. Chapter 7 provides the requirements for wind resistance and water-resistive barrier for exterior wall coverings. This chapter prescribes the exterior wall coverings as well as the water-resistive barrier required beneath the exterior materials. Exterior wall coverings regulated by this section include aluminum, stone and masonry veneer, wood, hardboard, particleboard, wood structural panel siding, wood shakes and shingles, exterior plaster, steel, vinyl, fiber cement and exterior insulation finish systems.

  Chapter 8 Roof-Ceiling Construction.

  Chapter 8 regulates the design and construction of roof-ceiling systems. This chapter contains two roof-ceiling framing systems: wood framing and cold-formed steel framing. Allowable span tables are provided to simplify the selection of rafter and ceiling joist size for wood roof framing and cold-formed steel framing. Chapter 8 also provides requirements for the application of ceiling finishes, the proper ventilation of concealed spaces in roofs (e.g., enclosed attics and rafter spaces), unvented attic assemblies and attic access.

  Chapter 9 Roof Assemblies.

  Chapter 9 regulates the design and construction of roof assemblies. A roof assembly includes the roof deck, vapor retarder, substrate or thermal barrier, insulation, vapor retarder and roof covering. This chapter provides the requirement for wind resistance of roof coverings.

  The types of roof covering materials and installation regulated by Chapter 9 are: asphalt shingles, clay and concrete tile, metal roof shingles, mineral-surfaced roll roofing, slate and slate-type shingles, wood shakes and shingles, built-up roofs, metal roof panels, modified bitumen roofing, thermoset and thermoplastic single-ply roofing, sprayed polyurethane foam roofing, liquid applied coatings and photovoltaic shingles. Chapter 9 also provides requirements for roof drainage, flashing, above deck thermal insulation, rooftop-mounted photovoltaic systems and recovering or replacing an existing roof covering.

  Chapter 10 Chimneys and Fireplaces.

  Chapter 10 contains requirements for the safe construction of masonry chimneys and fireplaces and establishes the standards for the use and installation of factory-built chimneys, fireplaces and masonry heaters. Chimneys and fireplaces constructed of masonry rely on prescriptive requirements for the details of their construction; the factory-built type relies on the listing and labeling method of approval. Chapter 10 provides the requirements for seismic reinforcing and anchorage of masonry fireplaces and chimneys.

  Chapter 11 [RE] Energy Efficiency.

  Chapter 11 is not adopted in California. See California Energy Code, Title 24, Part 6.

  Chapter 12 Mechanical Administration.

• CRC § 4.2 High relevance — show source text

  TABLE R702.4.2—BACKER BOARD MATERIALS	Col2
  ** MATERIAL**	** STANDARD**
  Glass mat gypsum backing panel	ASTM C1178
  Fiber-reinforced gypsum panels	ASTM C1278
  Nonasbestos fiber-cement backer board	ASTM C1288 or ISO 8336, Category C
  Nonasbestos fiber mat-reinforced cementitious backer units	ASTM C1325

  R702.5 Other finishes. Wood veneer paneling and hardboard paneling shall be placed on wood or cold-formed steel framing spaced not more than 16 inches (406 mm) on center. Wood veneer and hard board paneling less than [1] / 4 -inch (6 mm) nominal thickness shall not have less than a [3] / 8 -inch (10 mm) gypsum board or gypsum panel product backer. Wood veneer paneling not less than [1] / 4 -inch (6 mm) nominal thickness shall conform to ANSI/HPVA HP-1. Hardboard paneling shall conform to CPA/ANSI A135.5.

  R702.6 Wood shakes and shingles. Wood shakes and shingles shall conform to CSSB Grading Rules for Wood Shakes and Shingles and shall be permitted to be installed directly to the studs with maximum 24 inches (610 mm) on-center spacing.

  R702.6.1 Attachment. Nails, staples or glue are permitted for attaching shakes or shingles to the wall, and attachment of the shakes or shingles directly to the surface shall be permitted provided the fasteners are appropriate for the type of wall surface material. Where nails or staples are used, two fasteners shall be provided and shall be placed so that they are covered by the course above.

  R702.6.2 Furring strips. Where furring strips are used, they shall be 1 inch by 2 inches or 1 inch by 3 inches (25 mm by 51 mm or 25 mm by 76 mm), spaced a distance on center equal to the desired exposure, and shall be attached to the wall by nailing through other wall material into the studs.

  2025 CALIFORNIA RESIDENTIAL CODE 7-7

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

  WALL COVERING

  R702.7 Vapor retarders. Vapor retarder materials shall be classified in accordance with Table R702.7(1). A vapor retarder shall be provided on the interior side of frame walls of the class indicated in Table R702.7(2), including compliance with Table R702.7(3) or R702.7(4) where applicable. An approved design using accepted engineering practice for hygrothermal analysis shall be permitted as an alternative. Vapor retarders shall be installed in accordance with Section R702.7.2.

  The climate zone shall be determined in accordance with Section R702.7.3 and Table R702.7.3.

  Exceptions:

  1. Basement walls.

  2. Below-grade portion of any wall.

  3. Construction where accumulation, condensation or freezing of moisture will not damage the materials.

  4. A vapor retarder shall not be required in Climate Zones 1, 2 and 3.

  5. In Climate Zones 4 through 8, a vapor retarder shall not be required where the assembly complies with Table R702.7(5).

• CRC § 3.5. Medium relevance — show source text

  SECTION R702—INTERIOR COVERING

  R702.1 General. Interior coverings or wall finishes shall be installed in accordance with this chapter and Tables R702.1(1), R702.1(2), R702.1(3) and R702.3.5. Interior masonry veneer shall comply with the requirements of Section R703.7.1 for support and Section R703.7.4 for anchorage, except an airspace is not required. Interior finishes and materials shall conform to the flame spread and smoke-development requirements of Section R302.9.

  **

  TABLE R702.1(1)—THICKNESS OF PLASTER	Col2	Col3
  ** PLASTER BASE**	** FINISHED THICKNESS OF PLASTER FROM FACE OF LATH, MASONRY, CONCRETE** (inches)	** FINISHED THICKNESS OF PLASTER FROM FACE OF LATH, MASONRY, CONCRETE** (inches)
  ** PLASTER BASE**	** Gypsum Plaster**	** Cement Plaster**
  Expanded metal lath	5/8, minimuma	5/8, minimuma
  Wire lath	5/8, minimuma	3/4, minimum (interior)b
  Wire lath	5/8, minimuma	7/8, minimum (exterior)b
  Gypsum lathg	1/2, minimum	3/4, minimum (interior)b
  Masonry wallsc	1/2, minimum	1/2, minimum
  Monolithic concrete wallsc, d	5/8, maximum	7/8, maximum
  Monolithic concrete ceilingsc, d	3/8, maximume	1/2, maximum
  Gypsum veneer basef, g	1/16, minimum	3/4, minimum (interior)b
  Gypsum sheathingg	—	3/4, minimum (interior)b
  Gypsum sheathingg	—	7/8, minimum (exterior)b
  For SI: 1 inch = 25.4 mm. a. Where measured from back plane of expanded metal lath, exclusive of ribs, or self-furring lath, plaster thickness shall be3/4 inch minimum. b. Where measured from face of support or backing. c. Because masonry and concrete surfaces vary in plane, thickness of plaster need not be uniform. d. Where applied over a liquid bonding agent, finish coat shall be permitted to be applied directly to concrete surface. e. Approved acoustical plaster shall be permitted to be applied directly to concrete or over base coat plaster, beyond the maximum plaster thickness shown. f. Attachment shall be in accordance with Table R702.3.5. g. Where gypsum board is used as a base for cement plaster, a water-resistive barrier complying with Section R703.2 shall be provided.	For SI: 1 inch = 25.4 mm. a. Where measured from back plane of expanded metal lath, exclusive of ribs, or self-furring lath, plaster thickness shall be3/4 inch minimum. b. Where measured from face of support or backing. c. Because masonry and concrete surfaces vary in plane, thickness of plaster need not be uniform. d. Where applied over a liquid bonding agent, finish coat shall be permitted to be applied directly to concrete surface. e. Approved acoustical plaster shall be permitted to be applied directly to concrete or over base coat plaster, beyond the maximum plaster thickness shown. f.

• CRC § 5.5 Medium relevance — show source text

  [BSC-CG] See California Green Building Standards Code, Chapter 5, Division 5.5 for additional finish material pollutant control requirements.

  SECTION 802—GENERAL

  802.1 Interior wall and ceiling finish. The provisions of Section 803 shall limit the allowable fire performance and smoke development of interior wall and ceiling finish materials based on occupancy classification.

  802.2 Interior floor finish. The provisions of Section 804 shall limit the allowable fire performance of interior floor finish materials based on occupancy classification.

  [F] 802.3 Decorative materials and trim. Decorative materials and trim shall be restricted by combustibility, fire performance or flame propagation performance criteria in accordance with Section 806.

  802.4 Applicability. For buildings in flood hazard areas as established in Section 1612.3, interior finishes, trim and decorative materials below the elevation required by Section 1612 shall be flood-damage-resistant materials.

  802.5 Application. Combustible materials shall be permitted to be used as finish for walls, ceilings, floors and other interior surfaces of buildings.

  802.6 Windows. Show windows in the exterior walls of the first story above grade plane shall be permitted to be of wood or of unprotected metal framing.

  802.7 Foam plastics. Foam plastics shall not be used as interior finish except as provided in Section 803.4. Foam plastics shall not be used as interior trim except as provided in Section 806.6.1 or 2604.2. This section shall apply both to exposed foam plastics and to foam plastics used in conjunction with a textile or vinyl facing or cover.

  SECTION 803—WALL AND CEILING FINISHES

  803.1 General. Interior wall and ceiling finish materials shall be classified for fire performance and smoke development in accordance with Section 803.1.1 or 803.1.2, except as shown in Sections 803.1.3 through 803.15. Materials tested in accordance with Section 803.1.1 shall not be required to be tested in accordance with Section 803.1.2.

  803.1.1 Interior wall and ceiling finish materials tested in accordance with NFPA 286. Interior wall and ceiling finish materials shall be classified in accordance with NFPA 286 and comply with Section 803.1.1.1. Materials complying with Section 803.1.1.1 shall be considered to also comply with the requirements of Class A.

  803.1.1.1 Acceptance criteria for NFPA 286. The interior finish shall comply with the following:

  1. During the 40 kW exposure, flames shall not spread to the ceiling.

  2. The flame shall not spread to the outer extremity of the sample on any wall or ceiling.

  3. Flashover, as defined in NFPA 286, shall not occur.

  4. The peak heat release rate throughout the test shall not exceed 800 kW.

  5. The total smoke released throughout the test shall not exceed 1,000 m [2] .

  803.1.2 Interior wall and ceiling finish materials tested in accordance with ASTM E84 or UL 723. Interior wall and ceiling finish materials shall be classified in accordance with ASTM E84 or UL 723. Such interior finish materials shall be grouped in the following classes in accordance with their flame spread and smoke-developed indices.

  Class A = Flame spread index 0–25; smoke-developed index 0–450.

  Class B = Flame spread index 26–75; smoke developed index 0–450.

  Class C = Flame spread index 76–200; smoke-developed index 0–450.

• CRC § 803.1 Medium relevance — show source text

  INTERIOR FINISH, DECORATIVE MATERIALS AND FURNISHINGS

  SECTION 803—INTERIOR WALL AND CEILING FINISH IN EXISTING BUILDINGS

  803.1 General. The provisions of this section shall limit the allowable fire performance and smoke development of interior wall and ceiling finishes in existing buildings based on location and occupancy classification. Interior wall and ceiling finishes shall be classified in accordance with Section 803 of the California Building Code . Such materials shall be classified in accordance with NFPA 286, as indicated in Section 803.1.1, or in accordance with ASTM E84 or UL 723, as indicated in Section 803.1.2.

  Materials tested in accordance with Section 803.1.1 shall not be required to be tested in accordance with Section 803.1.2.

  803.1.1 Interior wall and ceiling finish materials tested in accordance with NFPA 286. Interior wall and ceiling finish materials shall be classified in accordance with NFPA 286 and tested in accordance with Section 803.1.1.1. Materials complying with Section 803.1.1.1 shall be considered to comply with the requirements of Class A specified in Section 803.1.2.

  803.1.1.1 Acceptance criteria for NFPA 286. The interior finish shall comply with the following:

  1. During the 40 kW exposure, flames shall not spread to the ceiling.

  2. The flame shall not spread to the outer extremity of the sample on any wall or ceiling.

  3. Flashover, as defined in NFPA 286, shall not occur.

  4. The peak heat release rate throughout the test shall not exceed 800 kW.

  5. The total smoke released throughout the test shall not exceed 1,000 m [2] .

  803.1.2 Interior wall and ceiling finish materials tested in accordance with ASTM E84 or UL 723. Interior wall and ceiling finishes shall be classified in accordance with ASTM E84 or UL 723. Such interior finish materials shall be grouped in the following classes in accordance with their flame spread and smoke-developed indices: Class A: Flame spread index 0–25; smoke-developed index 0–450. Class B: Flame spread index 26–75; smoke-developed index 0–450. Class C: Flame spread index 76–200; smoke-developed index 0–450.

  Exception: Materials tested in accordance with Section 803.1.1 and as indicated in Sections 803.1.3 through 803.15.

  803.1.3 Interior wall and ceiling finish materials with specific requirements. The materials indicated in Sections 803.4 through 803.15 shall be tested as indicated in the corresponding sections.

  803.2 Stability. Interior finish materials regulated by this chapter shall be applied or otherwise fastened in such a manner that such materials will not readily become detached where subjected to room temperatures of 200°F (93°C) for not less than 30 minutes.

  803.3 Interior finish requirements based on occupancy. Interior wall and ceiling finish shall have a flame spread index not greater than that specified in Table 803.3 for the group and location designated. Interior wall and ceiling finish materials tested in accordance with NFPA 286, and meeting the acceptance criteria of Section 803.1.1.1, shall be used where a Class A classification in accordance with ASTM E84 or UL 723 is required.

  |TABLE 803.

• CRC § 3-27 Medium relevance — show source text

  2025 CALIFORNIA RESIDENTIAL CODE 3-27

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

  BUILDING PLANNING

  TABLE R302.6—DWELLING UNIT GARAGE AND/OR CARPORT SEPARATION	Col2
  ** SEPARATION**	** MATERIAL**
  From the dwelling unit and attics	Not less than1/2-inch gypsum board or equivalent applied to the garage side
  From portions of the dwelling unit above the garage_or carport_	Not less than5/8-inch Type X gypsum board or equivalent
  Structure supporting floor/ceiling assemblies used for separation required by this section	Not less than1/2-inch gypsum board or equivalent
  Garages located less than 3 feet from a dwelling unit on the same lot	Not less than1/2-inch gypsum board or equivalent applied to the interior side of exterior walls that are within this area
  For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.	For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.

  R302.7 Under-stair protection. Enclosed space under stairs that is accessed by a door or access panel shall have walls, under-stair surface and any soffits protected on the enclosed side with [1] / 2 -inch (12.7 mm) gypsum board.

  R302.8 Foam plastics. For requirements for foam plastics, see Section R303.

  R302.8.1 Interior finish. Foam plastics used as interior finishes shall comply with Section R303.5.10.

  R302.9 Flame spread index and smoke-developed index for wall and ceiling finishes. Flame spread and smoke-developed indices for wall and ceiling finishes shall be in accordance with Sections R302.9.1 through R302.9.4.

  R302.9.1 Flame spread index. Wall and ceiling finishes shall have a flame spread index of not greater than 200.

  Exception: Flame spread index requirements for finishes shall not apply to trim defined as picture molds, chair rails, baseboards and handrails; to doors and windows or their frames; or to materials that are less than [1] / 28 inch (0.91 mm) in thickness cemented to the surface of walls or ceilings if these materials exhibit flame spread index values not greater than those of paper of this thickness cemented to a noncombustible backing.

  R302.9.2 Smoke-developed index. Wall and ceiling finishes shall have a smoke-developed index of not greater than 450.

  R302.9.3 Testing. Tests shall be made in accordance with ASTM E84 or UL 723.

  R302.9.4 Alternative test method. As an alternative to having a flame spread index of not greater than 200 and a smoke-developed index of not greater than 450 where tested in accordance with ASTM E84 or UL 723, wall and ceiling finishes shall be permitted to be tested in accordance with NFPA 286. Materials tested in accordance with NFPA 286 shall meet the following criteria:

  The interior finish shall comply with the following:

  1. During the 40 kW exposure, flames shall not spread to the ceiling.
  2. The flame shall not spread to the outer extremity of the sample on any wall or ceiling.
  3. Flashover, as defined in NFPA 286, shall not occur.
• CRC § 9.1 Medium relevance — show source text

  R302.9 Flame spread index and smoke-developed index for wall and ceiling finishes. Flame spread and smoke-developed indices for wall and ceiling finishes shall be in accordance with Sections R302.9.1 through R302.9.4.

  R302.9.1 Flame spread index. Wall and ceiling finishes shall have a flame spread index of not greater than 200.

  Exception: Flame spread index requirements for finishes shall not apply to trim defined as picture molds, chair rails, baseboards and handrails; to doors and windows or their frames; or to materials that are less than [1] / 28 inch (0.91 mm) in thickness cemented to the surface of walls or ceilings if these materials exhibit flame spread index values not greater than those of paper of this thickness cemented to a noncombustible backing.

  R302.9.2 Smoke-developed index. Wall and ceiling finishes shall have a smoke-developed index of not greater than 450.

  R302.9.3 Testing. Tests shall be made in accordance with ASTM E84 or UL 723.

  R302.9.4 Alternative test method. As an alternative to having a flame spread index of not greater than 200 and a smoke-developed index of not greater than 450 where tested in accordance with ASTM E84 or UL 723, wall and ceiling finishes shall be permitted to be tested in accordance with NFPA 286. Materials tested in accordance with NFPA 286 shall meet the following criteria:

  The interior finish shall comply with the following:

  1. During the 40 kW exposure, flames shall not spread to the ceiling.

  2. The flame shall not spread to the outer extremity of the sample on any wall or ceiling.

  3. Flashover, as defined in NFPA 286, shall not occur.

  4. The peak heat release rate throughout the test shall not exceed 800 kW.

  5. The total smoke released throughout the test shall not exceed 1,000 m [2] .

  R302.9.4.1 Stability. Interior finish materials regulated by this chapter shall be applied or otherwise fastened in such a manner that such materials will not readily become detached where subjected to room temperatures of 200°F (93°C) for not less than 30 minutes.

  R302.9.5 High-density polyethylene (HDPE) and polypropylene (PP). Where high-density polyethylene or polypropylene is used as an interior finish material, it shall be tested in accordance with NFPA 286 and comply with the criteria in Section R302.9.4.

  R302.10 Flame spread index and smoke-developed index for insulation. Flame spread and smoke-developed index for insulation shall be in accordance with Sections R302.10.1 through R302.10.4.

  R302.10.1 Insulation. Insulating materials installed within floor-ceiling assemblies, roof-ceiling assemblies, wall assemblies, crawl spaces and attics shall comply with the requirements of this section. They shall exhibit a flame spread index not to exceed 25 and a smoke-developed index not to exceed 450 where tested in accordance with ASTM E84 or UL 723. Insulating materials, where tested in accordance with the requirements of this section, shall include facings, where used, such as vapor retarders, vapor permeable membranes and similar coverings.

  Exceptions:

• CRC § 1.1 Medium relevance — show source text

  APPENDIX BK — COB CONSTRUCTION (MONOLITHIC ADOBE)

  BK103.5 Mixing. The clay subsoil, sand and straw for cob shall be thoroughly mixed by manual or mechanical means with water sufficient to produce a mix of a plastic consistency capable of bonding of successively placed layers or lifts.

  BK103.6 Installation. Cob shall be installed on the wall in lifts of a height that supports itself with minimal slumping.

  BK103.7 Dry joints. Each layer of cob shall be prevented from drying until the next layer is installed, to ensure bonding of successive layers. The top of each layer shall be kept moist and malleable with one or more of the following methods:

  1. Covering with a material that prevents loss of or holds moisture.

  2. Covering with a material that shades it from direct sun.

  3. Wetting.

  Where dry joints are unavoidable, the previous layer shall be wetted prior to application of the next layer.

  BK103.8 Drying holes. Where holes to facilitate drying are used, such holes shall be permitted to be of any depth and shall not exceed [3] / 4 inch (19 mm) in diameter. Drying holes shall not be spaced closer than 10 hole-diameters and shall not be placed in braced wall panels. The design load on load-bearing walls with drying holes shall not exceed 90 percent of the allowable bearing capacity as determined in accordance with Section BK106.8. Drying holes shall be filled with cob before final inspection.

  BK103.9 Adding roof loads to walls. Roof and ceiling loads shall not be added until walls are sufficiently dry to support them without compressing.

  SECTION BK104—FINISHES

  BK104.1 General. Cob walls shall not require a finish, except as required by Section BK104.2. Finishes applied to cob walls shall comply with this section and Chapters 3 and 7 unless stated otherwise in this section.

  BK104.1.1 Interior wall finishes. Where installed, interior wall finishes and interior fire protection shall comply with the applicable provisions of Section R302, and shall be plasters in accordance with Section BK104.4 or nonplaster wall coverings in accordance with Section R702.

  BK104.1.2 Exterior wall finishes. Where installed, exterior wall finishes shall be plasters in accordance with Section BK104.4, nonplaster exterior wall coverings in accordance with Section R703, or other finish systems in accordance with the following:

  1. Specifications and details of the finish system’s attachment to the wall or its independent support and of its means of draining or evaporating water that penetrates the exterior finish shall be approved.

  2. The vapor permeance of the combination of finish materials shall be 5 perms or greater to allow the transpiration of water vapor from the wall.

  3. Finish systems with weights greater than 10 pounds per square foot (48.9 kg/m) and less than or equal to 20 pounds per square foot (97.8 kg/m) of wall area shall require that the minimum total length of cob braced wall panels in Table BK106.11(3) be multiplied by a factor of 1.2.

  4. Finish systems with weights greater than 20 pounds per square foot (97.8 kg/m) of wall area shall require an engineered design.

  BK104.2 Where required. Cob walls exposed to rain due to local climate, building design and wall orientation shall be finished or clad to provide protection from excessive erosion.

• CRC § 1.1 Medium relevance — show source text

  BK104.1 General. Cob walls shall not require a finish, except as required by Section BK104.2. Finishes applied to cob walls shall comply with this section and Chapters 3 and 7 unless stated otherwise in this section.

  BK104.1.1 Interior wall finishes. Where installed, interior wall finishes and interior fire protection shall comply with the applicable provisions of Section R302, and shall be plasters in accordance with Section BK104.4 or nonplaster wall coverings in accordance with Section R702.

  BK104.1.2 Exterior wall finishes. Where installed, exterior wall finishes shall be plasters in accordance with Section BK104.4, nonplaster exterior wall coverings in accordance with Section R703, or other finish systems in accordance with the following:

  1. Specifications and details of the finish system’s attachment to the wall or its independent support and of its means of draining or evaporating water that penetrates the exterior finish shall be approved.

  2. The vapor permeance of the combination of finish materials shall be 5 perms or greater to allow the transpiration of water vapor from the wall.

  3. Finish systems with weights greater than 10 pounds per square foot (48.9 kg/m) and less than or equal to 20 pounds per square foot (97.8 kg/m) of wall area shall require that the minimum total length of cob braced wall panels in Table BK106.11(3) be multiplied by a factor of 1.2.

  4. Finish systems with weights greater than 20 pounds per square foot (97.8 kg/m) of wall area shall require an engineered design.

  BK104.2 Where required. Cob walls exposed to rain due to local climate, building design and wall orientation shall be finished or clad to provide protection from excessive erosion.

  BK104.3 Vapor retarders. Class I and II vapor retarders shall not be used on cob walls, except at cob walls surrounding showers or as required or addressed elsewhere in this appendix.

  BK104.4 Plaster. Plaster applied to cob walls shall be any type described in this section. Plaster thickness shall not exceed 3 inches (76 mm) on each face except with an approved engineered design.

  BK104.4.1 Plaster and membranes. Plaster shall be applied directly to cob walls to facilitate transpiration of moisture from the walls and to secure a mechanical bond between the plaster and the cob and shall comply with Section BK105.4.1.

  BK104.4.2 Plaster lath. The surface of cob walls shall be permitted to function as lath for plaster, with no other lath required. Metal, plastic and natural fiber lath shall be permitted to be used to limit plaster cracking, increase the plaster bond to the wall or to bridge dissimilar materials.

  BK104.4.3 Clay plaster. Clay plaster shall comply with Sections BK104.4.3.1 and BK104.4.3.2.

  BK104.4.3.1 General. Clay plaster shall be any plaster having a clay or clay subsoil binder. Such plaster shall contain sufficient clay to fully bind the sand or other aggregate and any reinforcing fibers. Reinforcing fibers shall be chopped straw, sisal, hemp, animal hair or other similar approved fibers.

  BK104.4.3.2 Clay subsoil requirements. The suitability of clay subsoil shall be determined in accordance with the Figure 2 Ribbon Test and the Figure 3 Ball Test in the appendix of ASTM E2392/E2392M.

• CRC § 3.5. Medium relevance — show source text

  Where measured from face of support or backing.
  c. Because masonry and concrete surfaces vary in plane, thickness of plaster need not be uniform.
  d. Where applied over a liquid bonding agent, finish coat shall be permitted to be applied directly to concrete surface.
  e. Approved acoustical plaster shall be permitted to be applied directly to concrete or over base coat plaster, beyond the maximum plaster thickness shown.
  f. Attachment shall be in accordance with Table R702.3.5.
  g. Where gypsum board is used as a base for cement plaster, a water-resistive barrier complying with Section R703.2 shall be provided.|For SI: 1 inch = 25.4 mm.
  a. Where measured from back plane of expanded metal lath, exclusive of ribs, or self-furring lath, plaster thickness shall be3/4 inch minimum.
  b. Where measured from face of support or backing.
  c. Because masonry and concrete surfaces vary in plane, thickness of plaster need not be uniform.
  d. Where applied over a liquid bonding agent, finish coat shall be permitted to be applied directly to concrete surface.
  e. Approved acoustical plaster shall be permitted to be applied directly to concrete or over base coat plaster, beyond the maximum plaster thickness shown.
  f. Attachment shall be in accordance with Table R702.3.5.
  g. Where gypsum board is used as a base for cement plaster, a water-resistive barrier complying with Section R703.2 shall be provided.|

  2025 CALIFORNIA RESIDENTIAL CODE 7-3

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

  WALL COVERING

  TABLE R702.1(2)—GYPSUM PLASTER PROPORTIONSa	Col2	Col3	Col4	Col5
  ** NUMBER**	** COAT**	** PLASTER BASE OR LATH**	** MAXIMUM VOLUME AGGREGATE** PER 100 POUNDS NEAT PLASTERb (cubic feet)	** MAXIMUM VOLUME AGGREGATE** PER 100 POUNDS NEAT PLASTERb (cubic feet)
  ** NUMBER**	** COAT**	** PLASTER BASE OR LATH**	** Damp Loose Sanda**	** Perlite or Vermiculitec**
  Two-coat work	Base coat	Gypsum lath	2.5	2
  Two-coat work	Base coat	Masonry	3	3
  Three-coat work	First coat	Lath	2d	2
  Three-coat work	Second coat	Lath	3d	2e
  Three-coat work	First and second coats	Masonry	3	3
  For SI: 1 inch = 25.4 mm, 1 cubic foot = 0.0283 m3, 1 pound = 0.454 kg. a. Wood-fibered gypsum plaster shall be mixed in the proportions of 100 pounds of gypsum to not more than 1 cubic foot of sand where applied on masonry or concrete. b. Where determining the amount of aggregate in set plaster, a tolerance of 10 percent shall be allowed. c. Combinations of sand and lightweight aggregate shall be permitted to be used, provided the volume and weight relationship of the combined aggregate to gypsum plaster is maintained. d.

• CRC § 2506.2 Medium relevance — show source text

  GYPSUM PANEL PRODUCTS AND PLASTER

  TABLE 2506.2—GYPSUM PANEL PRODUCTS MATERIALS AND ACCESSORIES—continued	Col2
  MATERIAL	STANDARD
  Factory-laminated gypsum panel product	ASTM C1766
  Fiber-reinforced gypsum panels	ASTM C1278
  Glass mat gypsum backing panel	ASTM C1178
  Glass mat gypsum panels	ASTM C1658
  Glass mat gypsum substrate used as sheathing	ASTM C1177
  Joint reinforcing tape and compound	ASTM C474; C475
  Nails for gypsum boards	ASTM C514, F547, F1667
  Steel screws	ASTM C954; C1002
  Standard specification for gypsum board	ASTM C1396
  Testing gypsum and gypsum products	ASTM C22; C472; C473

  2506.2.1 Other materials. Metal suspension systems for acoustical and lay-in panel ceilings shall comply with ASTM C635 listed in Chapter 35 and Section 13.5.6 of ASCE 7 for installation in high seismic areas.

  SECTION 2507—LATHING AND PLASTERING

  2507.1 General. Lathing and plastering materials and accessories shall be marked by the manufacturer’s designation to indicate compliance with the appropriate standards referenced in this section and stored in such a manner to protect them from the weather.

  2507.2 Standards. Lathing and plastering materials shall conform to the standards listed in Table 2507.2 and Chapter 35 and, where required for fire protection, shall conform to the provisions of Chapter 7.

  TABLE 2507.2—LATH, PLASTERING MATERIALS AND ACCESSORIES	Col2
  MATERIAL	STANDARD
  Accessories for gypsum veneer base	ASTM C1047
  Blended cement	ASTM C595
  Cold-formed steel studs and track, structural	AISI S240
  Cold-formed steel studs and track, nonstructural	AISI S220
  Exterior plaster bonding compounds	ASTM C932
  Hydraulic cement	ASTM C1157; C1600
  Gypsum casting and molding plaster	ASTM C59
  Gypsum Keene’s cement	ASTM C61
  Gypsum plaster	ASTM C28
  Gypsum veneer plaster	ASTM C587
  Interior bonding compounds, gypsum	ASTM C631
  Lime plasters	ASTM C5; C206
  Masonry cement	ASTM C91
  Metal lath	ASTM C847
  Plaster aggregates Sand Perlite Vermiculite	ASTM C35; C897 ASTM C35 ASTM C35
  Plastic cement	ASTM C1328
  Portland cement	ASTM C150
  Steel screws	ASTM C1002; C954
  Welded wire lath	ASTM C933
  Woven wire plaster base	ASTM C1032

  2025 CALIFORNIA BUILDING CODE 25-5

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

  GYPSUM PANEL PRODUCTS AND PLASTER

• CRC § 802.1 Medium relevance — show source text

  SECTION 802—DEFINITIONS

  802.1 Definitions. The following terms are defined in Chapter 2:

  FLAME SPREAD.

  FLAME SPREAD INDEX.

  INTERIOR FLOOR-WALL BASE.

  SITE-FABRICATED STRETCH SYSTEM.

  SMOKE-DEVELOPED INDEX.

  [California Code of Regulations, Title 19, Division 1, §1191] Approved.

  “Approved” means approved by the State Fire Marshal.

  [California Code of Regulations, Title 19, Division 1, §1196] Flame-retardant Chemical.

  “Flame-Retardant Chemical,” as used herein, means any chemical, chemical compound or chemical mixture which when properly applied to a fabric or material will render such fabric or material incapable of supporting combustion to the extent that it will success- fully withstand the tests and meet the specifications promulgated by the State Fire Marshal.

  [California Code of Regulations, Title 19, Division 1, §1201] Nonflammable Material.

  “Nonflammable Material,” as used herein, means a fabric or material which is inherently flame-resistant to the extent that it will meet the requirements of the fire resistance test herein prescribed, but shall not include materials which must be chemically treated or processed after manufacture to make them flame-resistant.

  [California Code of Regulations, Title 19, Division 1, §1202] Place of Public Assemblage.

  “Place of Public Assemblage,” as used herein, means any occupancy mentioned in Sections 13115 or 13119 of the Health and Safety Code.

  2025 CALIFORNIA FIRE CODE 8-3

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

  INTERIOR FINISH, DECORATIVE MATERIALS AND FURNISHINGS

  SECTION 803—INTERIOR WALL AND CEILING FINISH IN EXISTING BUILDINGS

  803.1 General. The provisions of this section shall limit the allowable fire performance and smoke development of interior wall and ceiling finishes in existing buildings based on location and occupancy classification. Interior wall and ceiling finishes shall be classified in accordance with Section 803 of the California Building Code . Such materials shall be classified in accordance with NFPA 286, as indicated in Section 803.1.1, or in accordance with ASTM E84 or UL 723, as indicated in Section 803.1.2.

  Materials tested in accordance with Section 803.1.1 shall not be required to be tested in accordance with Section 803.1.2.

  803.1.1 Interior wall and ceiling finish materials tested in accordance with NFPA 286. Interior wall and ceiling finish materials shall be classified in accordance with NFPA 286 and tested in accordance with Section 803.1.1.1. Materials complying with Section 803.1.1.1 shall be considered to comply with the requirements of Class A specified in Section 803.1.2.

  803.1.1.1 Acceptance criteria for NFPA 286. The interior finish shall comply with the following:

  1. During the 40 kW exposure, flames shall not spread to the ceiling.

  2. The flame shall not spread to the outer extremity of the sample on any wall or ceiling.

  3. Flashover, as defined in NFPA 286, shall not occur.

  4. The peak heat release rate throughout the test shall not exceed 800 kW.

  5. The total smoke released throughout the test shall not exceed 1,000 m [2] .

• CRC § 7.1 Medium relevance — show source text

  Covering R703 Insulation finish systems R703.9 Lath R703.7.1

  Plaster R703.7 Exterior Insulation and Finish Systems (EIFS) 703.9

  Exterior Wall

  Construction R302.1

  Fire-resistance rating R302.1

  Factory Built Chimneys R1005 Fireplace stoves R1005.3 Fireplaces R1004 Fastening Table R602.3(1) Fees, Permit R108 Finishes Flame spread and smoke density R302.9 For ceilings R805 Interior R302.9, R311, R702 Fire Sprinkler System (see Automatic Sprinkler System) Ceiling configurations R309.3.4.1.1, R309.3.4.1.2, R309.3.4.1.3 Flow rate R309.3.4.1 Fireblocking Barrier between stories R302.11,

  R602.8 Chimney R1003.19 Fireplace R1001.12 Fireplaces Chapter 10 Clearance R1001.11 Corbeling R1001.8 Factory-built R1004 Fireblocking R1001.12 Walls R1001.5

  Fire-Resistant Construction R302 Draftstopping R302.2 Dwelling-garage fire separation R302.6 Dwelling-garage opening and penetration R302.5 Exterior walls R302.1 Fireblocking R302.11 Floors R302.13

  Foam plastics R302.8 Insulation R302.10, R302.14 Penetrations R302.4

  Townhouse separation R302.2 Two-family dwellings R302.3 Under-stair protection R302.7 Wall and ceiling finishes R302.9 Fire-Separation Distance Exterior walls and wall projections R302.1 Ground-mounted photovoltaic systems R329.7, R329.8 Fixtures

  Clearance R327.1

  Flood protection R306.1.6 Plumbing fixture, general R326, R327 Flame Spread Index R302.10, R302.9 Flashing R703.4, R703.8.5, R903.2, R905 Flood Protection Plan Areas protected by the facilities of Central Valley Appendix CK Flood-Resistant Construction

  General and structural R301.2.4, R306 Floors

  Bathtub and shower R327.2 Concrete (on ground) R506 Loads R301, R501.2 Steel framing R505 Treated wood (on ground) R504

  Wood framing R502 Flue

  Area R1003.14, R1003.15 Lining R1003.11, R1003.12 Multiple R1003.13 Foam Plastics R303 Footings R403 Foundations Chapter 4 Cripple walls R602.10.9, R602.11.2, R602.9

  Frost protection R403.1.4.1 Inspection R109.1.1 Walls R404

  Frame

• CRC § 3.2 Medium relevance — show source text

  the latter with1/4″ mortar
  finish; ceiling: 1″ neat gypsum plaster or3/4″
  gypsum-vermiculite plaster, ratio of gypsum
  to fine vermiculite 2:1 to 3:1.|See
  Note
  12|2 hrs
  30 min||1||12–14|21/2| |F/C-S-32|3/4″|Floor: 21/2″ reinforced concrete or 2″ rein-
  forced gypsum tile, the latter with1/2″ mortar
  finish; ceiling: 1″ neat gypsum plaster or3/4″
  gypsum-vermiculite plaster, ratio of gypsum
  to fine vermiculite 2:1 to 3:1.|See
  Note
  12|3 hrs||1||12–14|3| |F/C-S-33|1″|Floor: 21/2″ reinforced concrete or 2″ rein-
  forced gypsum slabs, the latter with1/2″
  mortar finish; ceiling: 1″ gypsum-vermiculite
  plaster applied on metal lath in a ratio of 2:1
  to 3:1 gypsum to vermiculite by weight.|See
  Note
  12|4 hrs||1||12–14|4|

  RESOURCE A-98 2025 CALIFORNIA EXISTING BUILDING CODE

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

  TABLE 3.2—continued FLOOR/CEILING ASSEMBLIES—STEEL STRUCTURAL ELEMENTS	Col2	Col3	Col4	Col5	Col6	Col7	Col8	Col9	Col10
  ITEM CODE	MEMBRANE THICKNESS	CONSTRUCTION DETAILS	PERFORMANCE	PERFORMANCE	REFERENCE NUMBER	REFERENCE NUMBER	REFERENCE NUMBER	NOTES	REC. HOURS
  ITEM CODE	MEMBRANE THICKNESS	CONSTRUCTION DETAILS	LOAD	TIME	PRE-BMS-92	BMS-92	POST-BMS-92	POST-BMS-92	POST-BMS-92
  F/C-S-34	21/2″	Floor: 2″ reinforced concrete or 2″ precast reinforced Portland cement concrete or gypsum slabs, precast slabs to be finished with1/4″ mortar top coat; ceiling: 2″ precast reinforced gypsum tile, anchored into beams with metal ties or clips and covered with1/2″ 1:3 sanded gypsum plaster.	See Note 12	4 hrs		1		12–14	4
  F/C-S-35	1″	Floor: 1:3:6 Portland cement, sand and gravel concrete applied directly to the top of steel units and 11/2″ thick at top of cells, plus 1/2″ 1:21/2″  cement-sand finish, total thick- ness at top of cells,

• CRC § 2508.6.3 Medium relevance — show source text

  2508.6.3 Blocking of perimeter edges. Perimeter edges shall be blocked using a wood member not less than 2-inch by 6-inch (51 mm by 152 mm) nominal dimension. Blocking material shall be installed flat over the top plate of the wall to provide a nailing surface not less than 2 inches (51 mm) in width for the attachment of the gypsum panel product.

  2508.6.4 Fasteners. Fasteners used for the attachment of gypsum panel products to a horizontal diaphragm ceiling shall be as defined in Table 2508.6. Fasteners shall be spaced not more than 7 inches (178 mm) on center at all supports, including perimeter blocking, and not more than [3] / 8 inch (9.5 mm) from the edges and ends of the gypsum panel product.

  2508.6.5 Lateral force restrictions. Gypsum panel products shall not be used in diaphragm ceilings to resist lateral forces imposed by masonry or concrete construction.

  2508.6.6 Diaphragm ceiling connection to partitions. [DSA-SS & DSA-SS/CC and OSHPD 1, 1R, 2, 4 & 5] Gypsum board shall not be used in diaphragm ceilings to resist lateral forces imposed by partitions. Connection of diaphragm ceiling to the vertical lateral force resisting elements shall be designed and detailed to transfer lateral forces.

  Exception: [OSHPD 2] Single-story Type V skilled nursing or intermediate care facilities utilizing wood-frame or light-steel-frame construction.

  SECTION 2509—SHOWERS AND WATER CLOSETS

  2509.1 Wet areas. Showers and public toilet walls shall conform to Section 1210.2.

  2509.2 Base for tile. Materials used as a base for wall tile in tub and shower areas and wall and ceiling panels in shower areas shall be of materials listed in Table 2509.2 and installed in accordance with the manufacturer’s recommendations. Water-resistant gypsum backing board shall be used as a base for tile in water closet compartment walls when installed in accordance with GA-216 or ASTM C840 and the manufacturer’s recommendations. Regular gypsum wallboard is permitted under tile or wall panels in other wall and ceiling areas when installed in accordance with GA 216 or ASTM C840.

  TABLE 2509.2—BACKERBOARD MATERIALS	Col2
  MATERIAL	STANDARD
  Glass mat gypsum backing panel	ASTM C1178
  Nonasbestos fiber-cement backer board	ASTM C1288 or ISO 8336, Category C
  Fiber-mat reinforced cementitious backer unit	ASTM C1325

  2509.3 Limitations. Water-resistant gypsum backing board shall not be used in the following locations:

  1. Over a vapor retarder in shower or bathtub compartments.
  2. Where there will be direct exposure to water or in areas subject to continuous high humidity.

  SECTION 2510—LATHING AND FURRING FOR CEMENT PLASTER (STUCCO)

  2510.1 General. Exterior and interior cement plaster and lathing shall be done with the appropriate materials listed in Table 2507.2 and Chapter 35.

  2510.2 Weather protection. Materials shall be stored in such a manner as to protect them from the weather.

  2510.3 Installation. Installation of these materials shall be in compliance with ASTM C926 and ASTM C1063.

• CRC § 3.3 Medium relevance — show source text

  BN102.6 Cladding attachment. Cladding shall be specified and installed in accordance with Section R703 and one of the following:

  1. Table R703.3.3 for siding attachment to wood structural panels only.
  2. Table R703.8.4(2) for brick tie spacing and attachment to wood structural panels only.
  3. Fastening schedule and fasteners as required by Table R703.3(1), except fastener length shall be selected to meet or exceed the minimum required penetration into framing.

  BN102.7 Uplift connections. Where roof uplift tie-downs are required in accordance with Section R802.11, the roof tie-downs shall be fastened to either side of the double top plate or, where required to be fastened to studs, shall be installed on the interior face of the EPW in accordance with the manufacturer’s installation instructions. Where uplift forces determined in accordance with Section R602.3.5 require approved uplift connectors between floors or between the foundation and the floor, these uplift connectors shall not rely on wood structural panel sheathing for resisting the wind uplift forces.

  APPENDIX BN-6 2025 CALIFORNIA RESIDENTIAL CODE

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  CALIFORNIA RESIDENTIAL CODE – MATRIX ADOPTION TABLE

  APPENDIX BO – EXISTING BUILDINGS AND STRUCTURES

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

  Adopting agency	BSC	BSC- CG	SFM	HCD	Col6	Col7	DSA	Col9	Col10	OSHPD	Col12	Col13	Col14	Col15	Col16	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	5	5	5	5	5	5	5	5
  Adopt entire chapter
  Adopt entire chapter as amended (amended sections listed below)			X
  Adopt only those sections that are listed below
  Chapter / Section
  BO 102.4			X
  BO 102.5			X

  2025 CALIFORNIA RESIDENTIAL CODE APPENDIX BO-1

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  APPENDIX BO-2 2025 CALIFORNIA RESIDENTIAL CODE

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  BO EXISTING BUILDINGS AND STRUCTURES

• CRC § 6-106 Medium relevance — show source text

  R607 Glass Unit Masonry . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-106

  R608 Exterior Concrete Wall Construction. . . . . . . . . . . . 6-107

  R609 Exterior Windows and Doors. . . . . . . . . . . . . . . . . . . 6-172

  R610 Structural Insulated Panel Wall Construction . . . 6-175

  CHAPTER 7 WALL COVERING. . . . . . . . . . . . . . . . . . . . . . . . 7-3

  R701 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3

  R702 Interior Covering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3

  R703 Exterior Wall Covering . . . . . . . . . . . . . . . . . . . . . . . . . 7-10

  R704 Exterior Soffits and Fascias. . . . . . . . . . . . . . . . . . . . . 7-32

  R705 BIPV Systems for Exterior Wall Coverings and Fenestration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-35

  CHAPTER 8 ROOF-CEILING CONSTRUCTION. . . . . . . . . . . 8-3

  R801 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3

  R802 Wood Roof Framing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3

  R803 Roof Sheathing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-30

  R804 Cold-Formed Steel Roof Framing . . . . . . . . . . . . . . . 8-31

  R805 Ceiling Finishes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-44

  R806 Roof Ventilation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-44

  R807 Attic Access. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-46

  CHAPTER 9 ROOF ASSEMBLIES . . . . . . . . . . . . . . . . . . . . . .9-3

  R901 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3

  R902 Fire Classification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3

• CRC § 2.3.1 Medium relevance — show source text

  2025 CALIFORNIA RESIDENTIAL CODE APPENDIX CK-7

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  APPENDIX CK-8 2025 CALIFORNIA RESIDENTIAL CODE

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  2025 CALIFORNIA RESIDENTIAL CODE APPENDIX NA-1

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  APPENDIX NA-2 2025 CALIFORNIA RESIDENTIAL CODE

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

  Concrete Capillary break R506.2.3.1 Compressive strength R402.2 Floors (on ground) R506 Tile (roof) R905.3 Weathering Figure R301.2(1), R402.2 Construction

  3D-printed Appendix BM Cavity wall masonry R608 Cob Appendix BK Extended plate walls Appendix BN Flood-resistant R306

  Floors Chapter 5 Footings R403 Foundation material R402

  Foundation walls R404

  Foundations Chapter 4 Hemp-lime Appendix BL Masonry R606, R607, R608, R610 Pollutant control R340 Roofs Chapter 8 Steel framing R505, R603, R804 Strawbale Appendix BJ Straw-clay Appendix BI Walls Chapter 6 Waste R334.1 Wood framing R502, R602, R802 Construction Documents R106, R306.3.9

  Court Emergency escape and rescue openings R319.1, R319.2.4 Means of egress R318.1 Natural light R325.1.1 Covering Exterior R703

  Interior R702 Roof Chapter 9 Wall Chapter 7 Crawl Space R408

  Access R408.4

  Damper Fireplace R1001.7.1 Dampproofing R406 Day Care Appendix BD Defined R202 Large family day-care homes R336 Dead Loads R301.4

  Decay Protection against R304 Deck

  Attachment R318.5 Supported by exterior wall R507 Wood/plastic composite boards R507.2.2

  Definitions Building R202 Mechanical system R202 Plumbing R202 Design Criteria R301 Alternative provisions R301.1.1 Application R301.1 Climatic and geographic R301.2 Dead load R301.4

  Deflection R301.6 Engineered design R301.1.3

  Accessibility R322 Accessory Dwelling Unit R202 Authority to Enforce Automatic Fire Sprinkler Systems 1.8.9.1, R313.2 Accessory Structure Elevations R306.3.2

  Energy R330.5 Exterior walls R302.1

  Scope R101.2 Addition (see also Existing Buildings) Carbon monoxide alarms R311.2.2 Change of occupancy R110.1 Construction R302.2.3

• CRC § 2.5 Medium relevance — show source text

  Parapet construction R302.2.5 Scope R101.2 Separation R302.2 Structural independence R302.2.6 Trusses

  Steel R505.1.3, R804.3.6 Wood R502.12, R802.10 Tubular Daylighting Device (TDD) (see Skylights) Two-Family Dwellings R302.3

  Under Floor

  Space R408

  Vapor Retarders R702.7 Capillary break R506.2.3.1 Under floor R408.8 Vehicular Gates Appendix BH Veneer

  Masonry R703.7 Ventilation Adjoining rooms R325.1.3 Bathroom and kitchen R325.2

  Habitable rooms R325.1

  Roof R806

  Under floor R408.1 Venting (Mechanical) Chimney and vent connectors R1006 Fireplace R1006 General R325.3

  Violations R113 Visible Transmittance (VT)

  Wall Furnace (see Appliance) Wallboard (see Gypsum) Walls

  Bathtub compartments R327.2 Bracing, steel R603.9 Bracing, wood R602.10 Construction Chapter 6 Covering Chapter 7 Crawl space R202 Cripple R602.9

  INDEX-4 2025 CALIFORNIA RESIDENTIAL CODE

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  INDEX

  Deflection R301.7

  Exterior, defined R202 Exterior covering R703 Finishes R327.2, R702 Fireplace R1001.5 Foundation R404 Insulating concrete form R608.3, R608.4, R608.5.3 Steel framing R603 Structural insulated panels (SIP) R610 Thickness, masonry chimneys R1003.10 Wood framing R602 Waste

  Construction waste R334

  Water Closet R326.1, R327 Clearances for R327.1 Waterproofing And dampproofing R406 Wells (see Individual Water Supply) Whirlpool Bathtubs R324.3.1, P2720 Wind

  Design criteria R301.2, R301.2.1 Speed maps Figure R301.2(2) Window R609 Emergency Escape and Rescue Openings R319, R321.2.2 Fall protection R321.2 Glazing R324 Light and ventilation R325 Opening limiting devices R321.2.2 Wood

  Floor construction R502

  Foundation walls R404.2 Protection against decay R304 Roof-ceiling construction R802 Shakes R905.8 Shingles R905.7 Trusses R502.12, R802.10 Walls R602

  Yard R318.1, R319.1, R319.2.4, R325.1.1

  2025 CALIFORNIA RESIDENTIAL CODE INDEX-5

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  INDEX-6 2025 CALIFORNIA RESIDENTIAL CODE

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  HISTORY NOTE APPENDIX