Page 269 - 2018_IRC

WALL CONSTRUCTION

R603.3.3 Stud bracing. The flanges of cold-formed steel 9-foot and 10-foot (2743 mm and 3048 mm) walls.
1
studs shall be laterally braced in accordance with one of Horizontal steel straps shall be not less than 1 / 2
the following: inches in width and 33 mils in thickness (38 mm by
1. Gypsum board on both sides, structural sheathing on 0.84 mm). Straps shall be attached to the flanges of
both sides, or gypsum board on one side and struc- studs with one No. 8 screw. In-line blocking shall be
tural sheathing on the other side of load-bearing installed between studs at the termination of straps
walls with gypsum board installed with minimum and at 12-foot (3658 mm) intervals along the strap.
No. 6 screws in accordance with Section R702 and Straps shall be fastened to the blocking with two No.
structural sheathing installed in accordance with 8 screws.
Section R603.9 and Table R603.3.2(1). 3. Sheathing on one side and strapping on the other
2. Horizontal steel straps fastened in accordance with side fast accordan Figure
Figure R603.3.3(1) on both sides at mid-height for R603.3.3(2). Sheathing shall be installed in accor-
8-foot (2438 mm) walls, and at one-third points for dance with Item 1. Steel straps shall be installed in
accordance with Item 2.

TABLE R603.3.2.1(1)
ALL BUILDING WIDTHS GABLE ENDWALLS 8, 9 OR 10 FEET IN HEIGHT a, b, c, d
ULTIMATE WIND SPEED AND
EXPOSURE CATEGORY STUD SPACING MINIMUM STUD THICKNESS (mils)
(mph) MEMBER SIZE (inches)
Exp. B Exp. C 8-foot Studs 9-foot Studs 10-foot Studs
16 33 33 33
350S162
115 — 24 33 33 33
33
33
33
16
550S162
24 33 33 33
16 33 33 33
350S162
120 — 24 33 33 43
16
33
33
33
550S162
24 33 33 33
16 33 33 33
350S162
130 115 24 33 43 43
550S162 16 33 33 33
24 33 33 33
16 33 33 43
350S162
< 140 120 24 33 43 54
16
33
33
33
550S162
24 33 33 33
16 33 33 43
350S162
— 1 3 0 24 43 43 54
550S162 16 33 33 33
24 33 43 43
16 33 43 43
350S162
— < 1 4 0 24 43 54 54
16
33
33
33
550S162
24 43 43 43
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 mil = 0.0254 mm, 1 mile per hour = 0.447 m/s, 1 pound per square foot = 0.0479 kPa,
1 ksi = 1,000 psi = 6.895 MPa.
a. Deflection criterion L/240.
b. Design load assumptions:
Ground snow load is 70 psf.
Roof/ceiling dead load is 12 psf.
Floor dead load is 10 psf.
Floor live load is 40 psf.
Attic dead load is 10 psf.
c. Building width is in the direction of horizontal framing members supported by the wall studs.
d. Minimum Grade 33 ksi steel shall be used for 33 mil and 43 mil thicknesses. Minimum Grade 50 ksi steel shall be used for 54 and 68 mil thicknesses.
244 2018 INTERNATIONAL RESIDENTIAL CODE ®
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