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Q: What’s the best nailing pattern for built-up beams?
Q: I’ve always heard that installing plywood sheathing horizontally (perpendicular to the direction of the studs), with joints staggered, is stronger than installing it vertically. True? Is this true of roof sheathing too?
Q: Does OSB sag more than plywood when installed horizontally over 24-inch-center rafters?
Q: Do the layers of plywood in typical built-up headers add significant strength to the header?
Q: When you remove one rafter to install a skylight, do you have to double the two rafters at the sides of the opening? What about the headers?
Q: Does tongue-and-groove plywood add extra strength or stiffness to a floor system, or does it just help prevent floor squeaks?
Q: Is it necessary to place splices in built-up lumber beams directly above the support posts?
Q: Does CCA pressure treatment adversely affect the strength or durability of framing lumber?
Q: For the same loads, which is heavier, structural steel beams or lumber beams?
Q: Does a cathedral shed roof addition need collar ties to restrain the outward thrust of the rafters?
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