Many factors influence how a system responds to loading. For example, Appendix A indicates that one type of clay tile roof system has a live load value of 20 psf and a dead load value of 15 psf. AWC’s Appendix A lists a variety of live and dead load combinations for floors, ceilings and rafters. Simply reference Span Tables for Joists and Rafters published by the American Wood Council (AWC). But for most cases there is a cookbook solution. For a floor system you can find the individual weights of drywall, strapping, floor joists, subfloor, underlayment and carpet in an architectural handbook like Architectural Graphic Standards. To determine the dead load value for a given floor or roof system, the weight of all permanently installed materials in a given component are added together. Unlike stiffness, live loads and dead loads are added together to determine minimum design values for strength. Joists, and rafters must be strong enough not to break when loaded. Strength of a material is obviously important.
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