Page 239 - 2018_IRC

WALL CONSTRUCTION

the requirements of this section, lateral support shall be 2. For Seismic Design Categories D , D and D ,
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provided for rafters and ceiling joists in accordance where the distance from the top of the braced
with Section R802.8 and for trusses in accordance with wall panel to the top of the rafters or roof trusses
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Section R802.10.3. Roof ventilation shall be provided is 15 / inches (387 mm) or less, blocking
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in accordance with Section R806.1. between rafters or roof trusses shall be provided
1. For Seismic Design Categories A, B and C where above the braced wall panel in accordance with
the distance from the top of the braced wall panel to Figure R602.10.8.2(1).
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the top of the rafters or roof trusses above is 9 / 4 3. Where the distance from the top of the braced wall
inches (235 mm) or less, blocking between rafters panel to the top of rafters or roof trusses exceeds
or roof trusses shall not be required. Where the dis- 15 / inches (387 mm), the top plates of the braced
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tance from the top of the braced wall panel to the wall panel shall be connected to perpendicular raf-
top of the rafters or roof trusses above is between ters or roof trusses above in accordance with one
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9 / inches (235 mm) and 15 / inches (387 mm), or more of the following methods:
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blocking between rafters or roof trusses shall be 3.1. Soffit blocking panels constructed in
provided above the braced wall panel in accor- accordance with Figure R602.10.8.2(2).
dance with Figure R602.10.8.2(1).
Exception: Where the outside edge of truss ver- 3.2. Vertical blocking panels constructed in
accordance with Figure R602.10.8.2(3).
tical web members aligns with the outside face
of the wall studs below, wood structural panel 3.3. Blocking panels provided by the roof
sheathing extending above the top plate as truss manufacturer and designed in
shown in Figure R602.10.8.2(3) shall be permit- accordance with Section R802.
ted to be fastened to each truss web with three- 3.4. Blocking, blocking panels or other meth-
8d nails (2 / inches  0.131 inch) and blocking ods of lateral load transfer designed in
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between the trusses shall not be required. accordance with the AWC WFCM or
accepted engineering practice.
FULL-HEIGHT BLOCKING
CONTINUOUS RIM CONTINUOUS ALONG LENGTH
OR BAND JOIST OF BRACED WALL PANEL
PERPENDICULAR FRAMING

8d @ 6″ O.C. ALONG
8d @ 6″ O.C. ALONG BRACED WALL PANEL
BRACED WALL PANEL

BRACED WALL PANEL
BRACED WALL PANEL

3-16d @ 16″ O.C. ALONG 3-16d @ 16″ O.C. ALONG
BRACED WALL PANEL BRACED WALL PANEL

PERPENDICULAR FRAMING

FULL-HEIGHT BLOCKING
CONTINUOUS RIM CONTINUOUS ALONG LENGTH
OR BAND JOIST OF BRACED WALL PANEL

For SI: 1 inch = 25.4 mm.

FIGURE R602.10.8(1)
BRACED WALL PANEL CONNECTION WHEN PERPENDICULAR TO FLOOR/CEILING FRAMING

214 2018 INTERNATIONAL RESIDENTIAL CODE ®
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