Aug 21, 2019 Thus, people should check the wooden lumber carefully and buy only the wood that is free of knots. Another most important thing to remember.... Beams, studs, joists and rafters act as a structural skeleton and must be strong ... In other words, how much a joist or rafter bends under the maximum expected load. ... For a floor system you can find the individual weights of drywall, strapping, floor joists, ... Rather, the span is based on the rafter's "horizontal projection". 9c0aa8
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