The shear capacity for horizontal wood framed gypsum board diaphragm ceiling assemblies is what PLF for a gypsum board 1/2" thick with 16 o.c. spacing of framing members?

The shear capacity of a horizontal wood-framed gypsum board diaphragm ceiling assembly is determined by various factors, including the thickness of the gypsum board and the spacing of the framing members. For a 1/2-inch thick gypsum board with framing members spaced 16 inches on center (o.c.), industry standards and building codes indicate that the shear capacity can be as high as 90 pounds per linear foot (PLF).

This capacity is based on the proven structural performance of 1/2-inch gypsum board, which effectively resists shear forces when properly installed and supported. The use of framing spaced at 16 inches o.c. provides adequate support, maximizing the diaphragm's ability to distribute lateral forces and maintain structural integrity.

Understanding this shear capacity is essential for ensuring that the building's design meets safety standards and can adequately withstand lateral loads such as wind or seismic activity.