In various lumber mechanical "design" strength tables, and in National Design Specification (NDS) for Wood Construction, I assume they're referring to factored strength values, i.e., design allowables (correct me if I'm wrong). But they never seem to come out and say what factor of safety they're using. If the strength values are not ultimate, what approximate factor of safety, w.r.t. the lumber ultimate or rupture strength, is built into those tables or code? Thanks.
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