R602.10.8.2 Connections to Roof Framing

Top plates of exterior braced wall panels shall be attached to rafters or roof trusses above in accordance with Table R602.3(1) and this section. Where required by this section, blocking between rafters or roof trusses shall be attached to top plates of braced wall panels and to rafters and roof trusses in accordance with Table R602.3(1). A continuous band, rim or header joist or roof truss parallel to the braced wall panels shall be permitted to replace the blocking required by this section. Blocking shall not be required over openings in continuously sheathed braced wall lines. In addition to the requirements of this section, lateral support shall be provided for rafters and ceiling joists in accordance with Section R802.8 and for trusses in accordance with Section R802.10.3. Roof ventilation shall be provided in accordance with Section R806.1.

1. For Seismic Design Categories A, B and C where the distance from the top of the braced wall panel to the top of the rafters or roof trusses above is 9¹/₄ inches (235 mm) or less, blocking between rafters or roof trusses shall not be required. Where the distance from the top of the braced wall panel to the top of the rafters or roof trusses above is between 9¹/₄ inches (235 mm) and 15¹/₄ inches (387 mm), blocking between rafters or roof trusses shall be provided above the braced wall panel in accordance with Figure R602.10.8.2(1).

   Exception: Where the outside edge of truss vertical web members aligns with the outside face of the wall studs below, wood structural panel sheathing extending above the top plate as shown in Figure R602.10.8.2(3) shall be permitted to be fastened to each truss web with three-8d nails (2¹/₂ inches × 0.131 inch) and blocking between the trusses shall not be required.

2. For Seismic Design Categories D₀, D₁ and D₂, where the distance from the top of the braced wall panel to the top of the rafters or roof trusses is 15¹/₄ inches (387 mm) or less, blocking between rafters or roof trusses shall be provided above the braced wall panel in accordance with Figure R602.10.8.2(1).

3. Where the distance from the top of the braced wall panel to the top of rafters or roof trusses exceeds 15¹/₄ inches (387 mm), the top plates of the braced wall panel shall be connected to perpendicular rafters or roof trusses above in accordance with one or more of the following methods:

   1. 3.1. Soffit blocking panels constructed in accordance with Figure R602.10.8.2(2).
   2. 3.2. Vertical blocking panels constructed in accordance with Figure R602.10.8.2(3).
   3. 3.3. Blocking panels provided by the roof truss manufacturer and designed in accordance with Section R802.
   4. 3.4. Blocking, blocking panels or other methods of lateral load transfer designed in accordance with the AWC WFCM or accepted engineering practice.

For SI: 1 inch = 25.4 mm.

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.

1. Methods of bracing shall be as described in Section R602.10.4.

For SI: 1 inch = 25.4 mm, 1 foot =304.8 mm

1. Methods of bracing shall be as described in Section R602.10.4.