ABSTRACT
Several types of loads can act on wood buildings: dead loads, live loads, snow loads, wind loads, and seismic loads. The combinations of these loads that act on any building structure are prescribed by the relevant building code, such as the International Building Code (IBC) or the American Society of Civil Engineers (ASCE 7) load specifications. The ASCE 7 load standards and the IBC prescribe the critical combination of loads to be used for design for both the allowable stress design (ASD) method and the load and resistance factor design (LRFD) method. Since most wood buildings have sloped roofs, this chapter discusses how to combine the dead loads acting on the sloped roof surface with the live loads acting on horizontal projected plan area of roof surface. Roof live loads usually occur due to weight of equipment and maintenance personnel during the servicing of roof. The magnitude is function of roof slope and tributary area of structural element under consideration.
