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For one Western Red Cedar 2x6 plank, loaded vertically, attached to bombproof supports at either end: The estimated sag is about a quarter inch in the center, and the shear is 1.39 MpA. Materials data gives me an approximate Shear strength of 5.5 MpA, so you're well within limits. HOWEVER, the weak point will be the attachments. These will need to be ...


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Cedar is softer and slightly weaker than SPF, generally speaking, but is still up to the task. The key is board selection. Cedar is prone to large knots, like SPF. Look for small, tight knots and not very many of them. When in doubt, double them up. You mention adult usage. Several adults in the middle of an 8' span is pushing the limits of two rails. ...



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