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Chapter 26 — PLASTIC

Section 2604

California Building Code (Title 24, Part 2) · 2022 edition · updated 2026-09-12 · California

Italicized text is a California amendment to the model code, as printed in the official publication.

2604.1 General.

Plastic materials installed as interior finish or trim shall comply with Chapter 8. Foam plastics shall only be installed as interior finish where approved in accordance with the special provisions of Section 2603.9. Foam plastics that are used as interior finish shall meet the flame spread and smoke-developed index requirements for interior finish in accordance with Chapter 8. Foam plastics installed as interior trim shall comply with Section 2604.2.

Copyright © 2022 by, or licensed to, International Code Council, Inc. (ALL RIGHTS RESERVED); licensed to California Building Standards Commission pursuant to License Agreement. No further reproductions is authorized. Any unauthorized reproduction or distribution is a violation of the federal copyright act and the license agreement, and subject to civil and criminal penalties thereunder.

PLASTIC

[BS]TABLE 2603.13.1 CLADDING MINIMUM FASTENING REQUIREMENTS FOR DIRECT ATTACHMENT OVER FOAM PLASTIC SHEATHING TO SUPPORT CLADDING WEIGHT a

CLADDING FASTENER
THROUGH FOAM
SHEATHING INTO:		 CLADDING FASTENER TYPE
AND MINIMUM SIZEb		 CLADDING
FASTENER
VERTICAL
SPACING
(INCHES)		 MAXIMUM THICKNESS OF FOAM SHEATHINGc
(INCHES)
CLADDING FASTENER
THROUGH FOAM
SHEATHING INTO:		 CLADDING FASTENER TYPE
AND MINIMUM SIZEb		 CLADDING
FASTENER
VERTICAL
SPACING
(INCHES)		 16″ o.c. fastener horizontal spacing 16″ o.c. fastener horizontal spacing 16″ o.c. fastener horizontal spacing 16″ o.c. fastener horizontal spacing 24″ o.c. fastener horizontal spacing 24″ o.c. fastener horizontal spacing 24″ o.c. fastener horizontal spacing 24″ o.c. fastener horizontal spacing
CLADDING FASTENER
THROUGH FOAM
SHEATHING INTO:		 CLADDING FASTENER TYPE
AND MINIMUM SIZEb		 CLADDING
FASTENER
VERTICAL
SPACING
(INCHES)		 Cladding weight: Cladding weight: Cladding weight: Cladding weight: Cladding weight: Cladding weight: Cladding weight: Cladding weight:
CLADDING FASTENER
THROUGH FOAM
SHEATHING INTO:		 CLADDING FASTENER TYPE
AND MINIMUM SIZEb		 CLADDING
FASTENER
VERTICAL
SPACING
(INCHES)		 3 psf 11 psf 18 psf 25 psf 3 psf 11 psf 18 psf 25 psf
Wood Framing
(minimum 11/4- inch
penetration)		 0.113" diameter nail 6 2.00 1.45 0.75 DR 2.00 0.85 DR DR
Wood Framing
(minimum 11/4- inch
penetration)		 0.113" diameter nail 8 2.00 1.00 DR DR 2.00 0.55 DR DR
Wood Framing
(minimum 11/4- inch
penetration)		 0.113" diameter nail 12 2.00 0.55 DR DR 1.85 DR DR DR
Wood Framing
(minimum 11/4- inch
penetration)		 0.120" diameter nail 6 3.00 1.70 0.90 0.55 3.00 1.05 0.50 DR
Wood Framing
(minimum 11/4- inch
penetration)		 0.120" diameter nail 8 3.00 1.20 0.60 DR 3.00 0.70 DR DR
Wood Framing
(minimum 11/4- inch
penetration)		 0.120" diameter nail 12 3.00 0.70 DR DR 2.15 DR DR DR
Wood Framing
(minimum 11/4- inch
penetration)		 0.131" diameter nail 6 4.00 2.15 1.20 0.75 4.00 1.35 0.70 DR
Wood Framing
(minimum 11/4- inch
penetration)		 0.131" diameter nail 8 4.00 1.55 0.80 DR 4.00 0.90 DR DR
Wood Framing
(minimum 11/4- inch
penetration)		 0.131" diameter nail 12 4.00 0.90 DR DR 2.70 0.50 DR DR
Wood Framing
(minimum 11/4- inch
penetration)		 0.162" diameter nail 6 4.00 3.55 2.05 1.40 4.00 2.25 1.25 0.80
Wood Framing
(minimum 11/4- inch
penetration)		 0.162" diameter nail 8 4.00 2.55 1.45 0.95 4.00 1.60 0.85 0.50
Wood Framing
(minimum 11/4- inch
penetration)		 0.162" diameter nail 12 4.00 1.60 0.85 0.50 4.00 0.95 DR DR

For SI: 1 inch = 25.4 mm, 1 pound per square foot (psf) = 0.0479 kPa. DR = Design Required, o.c. = on center. a. Wood framing shall be spruce-pine-fir or any wood species with a specific gravity of 0.42 or greater in accordance with ANSI/AWC NDS. b. Nail fasteners shall comply with ASTM F1667, except nail length shall be permitted to exceed ASTM F1667 standard lengths. c. Foam sheathing shall have a minimum compressive strength of 15 psi in accordance with ASTM C578 or ASTM C1289.

[BS]TABLE 2603.13.2 FURRING MINIMUM FASTENING REQUIREMENTS FOR APPLICATION OVER FOAM PLASTIC SHEATHING TO SUPPORT CLADDING WEIGHT a, b

FURRING
MATERIAL		 FRAMING
MEMBER		 FASTENER
TYPE AND
MINIMUM SIZE		 MINIMUM
PENETRATION
INTO WALL
FRAMING
(INCHES)		 FASTENER
SPACING IN
FURRING
(INCHES)		 MAXIMUM THICKNESS OF FOAM SHEATHINGd
(INCHES)
FURRING
MATERIAL		 FRAMING
MEMBER		 FASTENER
TYPE AND
MINIMUM SIZE		 MINIMUM
PENETRATION
INTO WALL
FRAMING
(INCHES)		 FASTENER
SPACING IN
FURRING
(INCHES)		 16″ o.c. furringe 16″ o.c. furringe 16″ o.c. furringe 16″ o.c. furringe 24″ o.c. furringe 24″ o.c. furringe 24″ o.c. furringe 24″ o.c. furringe
FURRING
MATERIAL		 FRAMING
MEMBER		 FASTENER
TYPE AND
MINIMUM SIZE		 MINIMUM
PENETRATION
INTO WALL
FRAMING
(INCHES)		 FASTENER
SPACING IN
FURRING
(INCHES)		 Siding weight: Siding weight: Siding weight: Siding weight: Siding weight: Siding weight: Siding weight: Siding weight:
FURRING
MATERIAL		 FRAMING
MEMBER		 FASTENER
TYPE AND
MINIMUM SIZE		 MINIMUM
PENETRATION
INTO WALL
FRAMING
(INCHES)		 FASTENER
SPACING IN
FURRING
(INCHES)		 3 psf 11 psf 18 psf 25 psf 3 psf 11 psf 18 psf 25 psf
Minimum 1x
Wood Furringc		 Minimum 2x
Wood Stud		 0.131"
diameter nail		 11/4 8 4.00 2.45 1.45 0.95 4.00 1.60 0.85 DR
Minimum 1x
Wood Furringc		 Minimum 2x
Wood Stud		 0.131"
diameter nail		 11/4 12 4.00 1.60 0.85 DR 4.00 0.95 DR DR
Minimum 1x
Wood Furringc		 Minimum 2x
Wood Stud		 0.131"
diameter nail		 11/4 16 4.00 1.10 DR DR 3.05 0.60 DR DR
Minimum 1x
Wood Furringc		 Minimum 2x
Wood Stud		 0.162"
diameter nail		 11/4 8 4.00 4.00 2.45 1.60 4.00 2.75 1.45 0.85
Minimum 1x
Wood Furringc		 Minimum 2x
Wood Stud		 0.162"
diameter nail		 11/4 12 4.00 2.75 1.45 0.85 4.00 1.65 0.75 DR
Minimum 1x
Wood Furringc		 Minimum 2x
Wood Stud		 0.162"
diameter nail		 11/4 16 4.00 1.90 0.95 DR 4.00 1.05 DR DR
Minimum 1x
Wood Furringc		 Minimum 2x
Wood Stud		 No. 10
wood screw		 1 12 4.00 2.30 1.20 0.70 4.00 1.40 0.60 DR
Minimum 1x
Wood Furringc		 Minimum 2x
Wood Stud		 No. 10
wood screw		 1 16 4.00 1.65 0.75 DR 4.00 0.90 DR DR
Minimum 1x
Wood Furringc		 Minimum 2x
Wood Stud		 No. 10
wood screw		 1 24 4.00 0.90 DR DR 2.85 DR DR DR
Minimum 1x
Wood Furringc		 Minimum 2x
Wood Stud		 1/4"
lag screw		 11/2 12 4.00 2.65 1.50 0.90 4.00 1.65 0.80 DR
Minimum 1x
Wood Furringc		 Minimum 2x
Wood Stud		 1/4"
lag screw		 11/2 16 4.00 1.95 0.95 0.50 4.00 1.10 DR DR
Minimum 1x
Wood Furringc		 Minimum 2x
Wood Stud		 1/4"
lag screw		 11/2 24 4.00 1.10 DR DR 3.25 0.50 DR DR

For SI: 1 inch = 25.4 mm, 1 pound per square foot (psf) = 0.0479 kPa, 1 pound per square inch = 0.00689 MPa. DR = Design Required, o.c. = on center. a. Wood framing and furring shall be spruce-pine-fir or any wood species with a specific gravity of 0.42 or greater in accordance with ANSI/AWC NDS. b. Nail fasteners shall comply with ASTM F1667, except nail length shall be permitted to exceed ASTM F1667 standard lengths. c. Where the required cladding fastener penetration into wood material exceeds 3/4 inch and is not more than 11/2 inches, a minimum 2-inch nominal wood

furring or an approved design shall be used. d. Foam sheathing shall have a minimum compressive strength of 15 psi in accordance with ASTM C578 or ASTM C1289. e. Furring shall be spaced not greater than 24 inches on center in a vertical or horizontal orientation. In a vertical orientation, furring shall be located over wall

studs and attached with the required fastener spacing. In a horizontal orientation, the indicated 8-inch and 12-inch fastener spacing in furring shall be achieved by use of two fasteners into studs at 16 inches and 24 inches on center, respectively.

26-10 2022 CALIFORNIA BUILDING CODE

Copyright © 2022 by, or licensed to, International Code Council, Inc. (ALL RIGHTS RESERVED); licensed to California Building Standards Commission pursuant to License Agreement. No further reproductions is authorized. Any unauthorized reproduction or distribution is a violation of the federal copyright act and the license agreement, and subject to civil and criminal penalties thereunder.

2604.1.1 Plenums. Foam plastics installed in plenums as interior wall or ceiling finish shall comply with Section 2603.7. Foam plastics installed in plenums as interior trim shall comply with Sections 2604.2 and 2603.7.

[F] 2604.2 Interior trim. Foam plastic used as interior trim shall comply with Sections 2604.2.1 through 2604.2.4.

[F] 2604.2.1 Density. The minimum density of the interior trim shall be 20 pcf (320 kg/m 3 ).

[F] 2604.2.2 Thickness. The maximum thickness of the interior trim shall be 1 /2 inch (12.7 mm) and the maximum width shall be 8 inches (204 mm).

[F] 2604.2.3 Area limitation. The interior trim shall not constitute more than 10 percent of the specific wall or ceiling areas to which it is attached.

[F] 2604.2.4 Flame spread. The flame spread index shall not exceed 75 where tested in accordance with ASTM E84 or UL 723. The smoke-developed index shall not be limited.

Exception: Where the interior trim material has been tested as an interior finish in accordance with NFPA 286 and complies with the acceptance criteria in Section 803.1.1.1, it shall not be required to be tested for flame spread index in accordance with ASTM E84 or UL 723.

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▸Contents — California Building Code (Title 24, Part 2)
California Building Code (Title 24, Part 2)
  1. Chapter 2 — DEFINITIONS AND ABBREVIATIONS
  2. Appendix G — FLOOD-RESISTANT
  3. Appendix L — EARTHQUAKE RECORDING
  4. Appendix M — TSUNAMI-GENERATED
  5. Appendix N — REPLICABLE
  6. Appendix O — PERFORMANCE-BASED
  7. Chapter 1 — SCOPE AND ADMINISTRATION
  8. Chapter 3 — OCCUPANCY CLASSIFICATION AND USE
  9. Chapter 4 — SPECIAL DETAILED REQUIREMENTS BASED ON OCCUPANCY A…
  10. Chapter 5 — GENERAL BUILDING HEIGHTS AND AREAS
  11. Chapter 6 — TYPES OF CONSTRUCTION
  12. Chapter 7 — FIRE AND SMOKE PROTECTION FEATURES
  13. Chapter 7A — MATERIALS AND CONSTRUCTION
  14. Chapter 8 — INTERIOR FINISHES
  15. Chapter 9 — FIRE PROTECTION AND LIFE SAFETY SYSTEMS
  16. Chapter 10 — MEANS OF EGRESS
  17. Chapter 11A — HOUSING ACCESSIBILITY
  18. Chapter 11B — ACCESSIBILITY TO PUBLIC BUILDINGS, PUBLIC ACCOMM…
  19. Chapter 12 — INTERIOR ENVIRONMENT
  20. Chapter 14 — EXTERIOR WALLS
  21. Chapter 15 — ROOF ASSEMBLIES AND ROOFTOP STRUCTURES
  22. Chapter 16 — STRUCTURAL DESIGN
  23. Chapter 16A — STRUCTURAL DESIGN
  24. Chapter 17 — SPECIAL INSPECTIONS AND TESTS
  25. Chapter 18 — SOILS AND FOUNDATIONS
  26. Chapter 19 — CONCRETE
  27. Chapter 20 — ALUMINUM
  28. Chapter 21 — MASONRY
  29. Chapter 22 — STEEL
  30. Chapter 23 — WOOD
  31. Chapter 24 — GLASS AND GLAZING
  32. Chapter 25 — GYPSUM BOARD, GYPSUM PANEL PRODUCTS AND PLASTER
  33. ▸Chapter 26 — PLASTIC
    Overview
    1. Section 2601
    2. Section 2602
    3. Section 2603
    4. Section 2604
    5. Section 2605
    6. Section 2606
    7. Section 2607
    8. Section 2608
    9. Section 2609
    10. Section 2610
    11. Section 2611
    12. Section 2612
    13. Section 2613
    14. Section 2614
  34. Chapter 27 — ELECTRICAL
  35. Chapter 28 — MECHANICAL SYSTEMS
  36. Chapter 30 — ELEVATORS AND CONVEYING SYSTEMS
  37. Chapter 31 — SPECIAL CONSTRUCTION
  38. Chapter 31B — PUBLIC POOLS
  39. Chapter 31C — RADIATION
  40. Chapter 31D — FOOD ESTABLISHMENTS
  41. Chapter 31F — MARINE OIL TERMINALS
  42. Chapter 32 — ENCROACHMENTS INTO THE PUBLIC RIGHT-OF-WAY
  43. Chapter 33 — SAFEGUARDS DURING CONSTRUCTION
  44. Chapter 35 — REFERENCED STANDARDS
  45. Appendix A — EMPLOYEE QUALIFICATIONS
  46. Appendix B — BOARD OF APPEALS
  47. Appendix C — GROUP U – AGRICULTURAL BUILDINGS
  48. Appendix D — FIRE DISTRICTS
  49. Appendix F — RODENTPROOFING
  50. Appendix H — SIGNS
  51. Appendix I — PATIO COVERS
  52. Appendix J — GRADING
  53. Appendix K — GROUP R-3 AND GROUP R-3.1 OCCUPANCIES
  54. Appendix P — EMERGENCY HOUSING

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