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Appendix BN — EXTENDED PLATE WALL CONSTRUCTION

Section BN102 — CONSTRUCTION REQUIREMENTS

2025 California Residential Code (Title 24, Part 2.5) · 2025 edition · updated 2026-07-27 · California

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

BN102.1 Framing.

The 2 × 6 top and bottom plates and 2 × 4 studs shall be used in accordance with Figures BN102.1(1) and BN102.1(2). A single top plate shall not be permitted. Wall framing shall comply with the requirements for 2 × 4 framing in accordance with Section R602.

FIGURE BN102.1(1)—EXTENDED PLATE WALL (EPW) CONSTRUCTION, SECTION VIEW

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APPENDIX BN — EXTENDED PLATE WALL CONSTRUCTION

FIGURE BN102.1(2)—EXTENDED PLATE WALL, ELEVATION VIEW

BN102.2 Wood structural panel sheathing.

Wood structural panel sheathing with a nominal thickness of [7] / 16 inch (11 mm) to [1] / 2 inch (12.7 mm) shall be installed vertically and attached to wall plates and studs in accordance with Figure BN102.1(2) and Table BN102.2. The vertical joints between adjacent wood structural panels shall occur only at framing members. Where used as part of wall bracing, each wood structural panel shall be installed without horizontal joints between the extended top and bottom plates.

TABLE BN102.2—SHEATHING FASTENER REQUIREMENTS FOR EPW

** MINIMUM NAIL LENGTH AND DIAMETER** ** MAXIMUM FASTENER SPACING** ** MAXIMUM FASTENER SPACING**
** MINIMUM NAIL LENGTH AND DIAMETER** At perimeter of wood structural panels
(inches)		 In field of wood structural panels
(inches)
No. 37 power-tool driven common nail (31/2″ × 0.131″)a, b, c 3″ o.c. 6″ o.c.
16d box nail (31/2″ × 0.135″)a, c 3″ o.c. 6″ o.c.
For SI: 1 inch = 25.4 mm.
a. At top and bottom plates where the wood structural panel is in direct contact with the framing, 8d common nail (21/2 inches × 0.131 inch) shall be permitted.
b. Full round head nail with minimum head diameter of 0.281 inch (7 mm).
c. Nails are in accordance with ASTM F1667.

BN102.3 Wall bracing.

Wall bracing for EPW construction shall comply with the requirements for WSP or CS-WSP or CS-G bracing methods in Section R602.10, except that the sheathing fasteners shall comply with Table BN102.2.

BN102.3.1 Simplified wall bracing. With the exception of Section R602.12.2, Item 2, provisions of Section R602.12 shall be applicable to EPW construction. The fastening schedule for wood structural panels shall comply with Table BN102.2.

BN102.4 Rim joists.

Rim joists supporting an EPW shall comply with Figure BN102.4(1) or BN102.4(2). Sawn 2× lumber or engineered wood rim board shall be used to construct rim (band) joists. Engineered wood rim board shall comply with Section R602.1.7. The minimum bearing length requirements for the floor joists shall be satisfied or joists shall be supported with metal hangers.

APPENDIX BN-4 2025 CALIFORNIA RESIDENTIAL CODE

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For SI: 1 inch = 25.4 mm.

For SI: 1 inch = 25.4 mm.

APPENDIX BN — EXTENDED PLATE WALL CONSTRUCTION

FIGURE BN102.4(1)—RIM JOIST CONSTRUCTION FOR EPW—DOUBLE MEMBER

FIGURE BN102.4(2)—RIM JOIST CONSTRUCTION FOR EPW—INSET DOUBLE MEMBER

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APPENDIX BN — EXTENDED PLATE WALL CONSTRUCTION

BN102.4.1 Rim joist used as rim header. Wood rim boards, or band joists, that serve as rim board headers shall be constructed in accordance with Section R602.7.2.

BN102.5 Foam plastic insulating sheathing.

Foam plastic insulating sheathing with a total thickness of 2 inches (51 mm) shall be installed directly to the exterior surface of the 2 × 4 studs between top and bottom plates and flush with the 2 × 6 top and bottom plates as shown in Figure BN102.1(1). The foam plastic insulating sheathing shall comply with ASTM C578 or ASTM C1289 with a minimum compressive strength of 15 psi and shall be permitted to be installed in one or more layers.

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 DSA OSHPD 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

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APPENDIX BO-2 2025 CALIFORNIA RESIDENTIAL CODE

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▸ Contents — 2025 California Residential Code (Title 24, Part 2.5)
2025 California Residential Code (Title 24, Part 2.5)
  1. Chapter 1 — ADMINISTRATION
  2. Chapter 2 — DEFINITIONS
  3. Chapter 3 — BUILDING PLANNING
  4. Chapter 4 — FOUNDATIONS
  5. Chapter 5 — FLOORS
  6. Chapter 6 — WALL CONSTRUCTION
  7. Chapter 7 — WALL COVERING
  8. Chapter 8 — ROOF-CEILING CONSTRUCTION
  9. Chapter 9 — ROOF ASSEMBLIES
  10. Chapter 10 — CHIMNEYS AND FIREPLACES
  11. Chapter 44 — REFERENCED STANDARDS
  12. Appendix AA — BOARD OF APPEALS
  13. Appendix AB — PERMIT FEES
  14. Appendix AC — RESERVED
  15. Appendix BA — RESERVED
  16. Appendix BB — TINY HOUSES
  17. Appendix BC — RESERVED
  18. Appendix BD — RESERVED
  19. Appendix BE — RADON CONTROL METHODS
  20. Appendix BF — PATIO COVERS
  21. Appendix BG — SOUND TRANSMISSION
  22. Appendix BH — AUTOMATIC VEHICULAR GATES
  23. Appendix BI — LIGHT STRAW-CLAY CONSTRUCTION
  24. Appendix BJ — STRAWBALE CONSTRUCTION
  25. Appendix BK — COB CONSTRUCTION (MONOLITHIC ADOBE)
  26. Appendix BL — HEMP-LIME (HEMPCRETE) CONSTRUCTION
  27. Appendix BM — 3D-PRINTED BUILDING CONSTRUCTION
  28. ▸ Appendix BN — EXTENDED PLATE WALL CONSTRUCTION
    Overview
    1. Section BN101 — GENERAL
    2. Section BN102 — CONSTRUCTION REQUIREMENTS
  29. Appendix BO — EXISTING BUILDINGS AND STRUCTURES
  30. Appendix CA — RESERVED
  31. Appendix CB — RESERVED
  32. Appendix CC — RESERVED
  33. Appendix CD — RESERVED
  34. Appendix CE — RESERVED
  35. Appendix CF — RESERVED
  36. Appendix CG — NONSEWERED SANITATION SYSTEMS
  37. Appendix CH — PRIVATE SEWAGE DISPOSAL
  38. Appendix CI — SWIMMING POOL SAFETY ACT
  39. Appendix CJ — EMERGENCY HOUSING
  40. Appendix CK — AREAS PROTECTED BY THE FACILITIES OF THE CENTRAL…

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