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Where stone and masonry veneer is installed in accordance with Section R703.7, wall bracing shall comply with this section.

For all buildings in Seismic Design Categories A, B and C, wall bracing at exterior and interior braced wall lines shall be in accordance with Section R602.10 and the additional requirements of Table R602.12(1).

For detached one- or two-family dwellings in Seismic Design Categories D0, D1 and D2, wall bracing and hold downs at exterior and interior braced wall lines shall be in accordance with Sections R602.10 and R602.11 and the additional requirements of Section R602.12.1 and Table R602.12(2). In Seismic Design Categories D0, D1 and D2, cripple walls are not permitted, and required interior braced wall lines shall be supported on continuous foundations.

TABLE R602.12(1)
STONE OR MASONRY VENEER WALL BRACING REQUIREMENTS, WOOD
OR STEEL FRAMING, SEISMIC DESIGN CATEGORIES A, B and C
SEISMIC DESIGN CATEGORY NUMBER OF WOOD
FRAMED STORIES
WOOD FRAMED STORY MINIMUM SHEATHING AMOUNT
(length of braced wall line length)a
A or B 1, 2 or 3 all TABLE R602.10.1.2(2)
C 1 1 only TABLE R602.10.1.2(2)
2 top TABLE R602.10.1.2(2)
bottom 1.5 times length required by
TABLE R602.10.1.2(2)
3 top TABLE R602.10.1.2(2)
middle 1.5 times length required by
TABLE R602.10.1.2(2)
bottom 1.5 times length required by
TABLE R602.10.1.2(2)
  1. Applies to exterior and interior braced wall lines.
TABLE R602.12(2)
STONE OR MASONRY VENEER WALL BRACING REQUIREMENTS,
ONE- AND TWO-FAMILY DETACHED DWELLINGS, SEISMIC DESIGN CATEGORIES D0, D1 and D2
SEISMIC DESIGN
CATEGORY
NUMBER OF
STORIESa
STORY MINIMUM SHEATHING
AMOUNT (percent of
braced wall line length)b
MINIMUM SHEATHING THICKNESS AND FASTENING SINGLE STORY HOLD DOWN FORCE (lb)c CUMULATIVE HOLD DOWN FORCE (lb)d
D0 1 1 only 35 7/16-inch wood structural panel sheathing with 8d common nails spaced at 4 inches on center at panel edges, 12 inches on center at intermediate supports; 8d common nails at 4 inches on center at braced wall panel end posts with hold down attached N/A
2 top 35 1900
bottom 45 3200 5100
3 top 40 1900
middle 45 3500 5400
bottom 60 3500 8900
D1 1 1 only 45 2100
2 top 45 2100
bottom 45 3700 5800
3 top 45 2100
middle 45 3700 5800
bottom 60 3700 9500
D2 1 1 only 55 2300
2 top 55 2300
bottom 55 3900 6200
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.479 kPa, 1 pound-force = 4.448 N.
  1. Cripple walls are not permitted in Seismic Design Categories D0, D1 and D2.
  2. Applies to exterior and interior braced wall lines.
  3. Hold down force is minimum allowable stress design load for connector providing uplift tie from wall framing at end of braced wall panel at the noted story to wall framing at end of braced wall panel at the story below, or to foundation or foundation wall. Use single story hold down force where edges of braced wall panels do not align; a continuous load path to the foundation shall be maintained. [See Figure R602.12].
  4. Where hold down connectors from stories above align with stories below, use cumulative hold down force to size middle and bottom story hold down connectors. (See Figure R602.12).
FIGURE R602.12
HOLD DOWNS AT EXTERIOR AND INTERIOR BRACED WALL PANELS
R602.12.1 Seismic Design Categories D
0, D1 and D2. Wall bracing where stone and masonry veneer exceeds the first story height in Seismic Design Categories D0, D1 and D2 shall conform to the requirements of Sections R602.10 and R602.11 and the following requirements.
R602.12.1.1 Length of Bracing
The length of bracing along each braced wall line shall be in accordance with Table R602.12(2).
R602.12.1.2 Braced Wall Panel Location
Braced wall panels shall begin no more than 8 feet (2440 mm) from each end of a braced wall line and shall be spaced a maximum of 25 feet (7620 mm) on center.
R602.12.1.3 Braced Wall Panel Construction
Braced wall panels shall be constructed of sheathing with a thickness of not less than 7/16 inch (11 mm) nailed with 8d common nails spaced 4 inches (102 mm) on center at all panel edges and 12 inches (305 mm) on center at intermediate supports. The end of each braced wall panel shall have a hold down device in accordance with Table R602.12(2) installed at each end. Size, height and spacing of wood studs shall be in accordance with Table R602.3(5).
R602.12.1.4 Minimum Length of Braced Panel
Each braced wall panel shall be at least 48 inches (1219 mm) in length, covering a minimum of 3 stud spaces where studs are spaced 16 inches (406 mm) on center and covering a minimum of 2 stud spaced where studs are spaced 24 inches on center.
R602.12.1.5 Alternate Braced Wall Panel
Alternate braced wall panels described in Section R602.10.3.2 shall not replace the braced wall panel specification of this section.
R602.12.1.6 Continuously Sheathed Wall Bracing
Continuously sheathed provisions of Section R602.10.4 shall not be used in conjunction with the wall bracing provisions of this section.

Related Code Sections

R602.12 Wall Construction, Wall Bracing and Stone and Masonry Veneer
Where stone and masonry veneer is installed in accordance with Section R703.7, wall bracing shall comply with this section. For all buildings ...