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Allowable Shear Values

(Wind or Seismic Design of Vertical Diaphragms with QuietBrace)

Two types of fasteners meet the requirements for the installation of QuietBrace. These fasteners, spaced properly in accordance with the installation instructions, are critical in providing the allowable shear performance/racking resistance values of the wall assembly. Refer to “QuietBrace Shear Values” when specific engineering design is required.

*For QuietBrace properly installed on 16" o.c. wood framing.

NOTE:

1. Fasteners spaced 6" o.c. in the field.
2. The table shear values apply when all panel edges are backed with nominal 2-inch or wider framing of Douglas-fir, larch, or southern pine. For framing lumber of other species, find specific gravity for lumber in the AF&PA National Design Specification. If specific gravity is 0.42 or greater, for design multiply the shear value from the above table by 0.82, or by 0.65 for species with specific gravity less than 0.42.
3. Fiberboard sheathing diaphragms shall not be used to brace concrete or masonry walls.
4. Fiberboard sheathing installed on one side only.
5. Shear values above include ultimate load to design load reduction of 2.8.
6. Shear values for QuietBrace and gypsum wallboard, if on opposite sides of the wall studs, can be added to determine shear capacity of the assembly for wind design (2003 IBC 2305.3.8).