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aggregate allowable loads beams bending black knots bolt BUILDING CODE STANDARD butt joints cent column compression members compressive strength concrete conform connector construction diameter distance Douglas fir ducts edge exceed feet fiber fillet weld fire flammable liquids flange grade gypsum heartwood holes installed joists lag screw laminations length less located lumber Materials See Section maximum Medium metal minimum mortar nominal one-half inch parallel to grain permitted piece pine pipe pitch pockets plates portland cement pounds per square pressure red knots reinforcement required not required scarf joints Seasoning checks shake shear side slab slope of grain spaced specified splits sprinklers square inch steel stiffened storage strength ratio structural surface tank temperature tensile tensile strength tension test specimens thickness tight timbers tion torn grain U.B.C. Standard Uniform Building Code unit stress valve vent Volume I Sec wall welds wide face width wood