A beam of four 2x10s and no plywood has 18% more bending resistance than three 2x10s with plywood, but a beam of two 2x12s has 1.5% less bending resistance than the triple 2×10 beam with no plywood. Finally, three 2x12s offer 48% more bending resistance than three 2x10s.
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But there’s no substitute for on-the-job retraining. For the new deck, I used pressure-treated framing lumber, of course, and installed composite decking and western red cedar guardrails. The refurbished deck got the same decking and guardrails plus some extra joists to support them.
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How far can a deck beam span? Fine Homebuilding. Sizing deck beams got a lot easier when the 2015 IRC came out. Deck builders can now refer to Section R507.6 Deck Beams and Table R507.6 Deck Beam Span Lengths to sort out the size of 2 ply and 3 ply built up beams made from 2×6 through 2×12 lumber.
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Since the deck had a 15-foot-square footprint, we built the layout box that size, using 2x6s set on edge. Then we rough-cut the framing and laid it in place, without fastening anything together. To mark the curve on the joists, we made a 10-foot-long beam compass from a 2x4 and swung it from a pivot point located at the open corner of the deck.