I'm trying to find information on how to size a rafter. my application is for a shed roof. i want to use solid timber, green fir, to get a timber frame look. the roof is going to cover a portion of my deck, which i'm planning to screen in. i want to use 36 inch centers for the rafters and the span is 16 feet with a 2/12 pitch.. Rafter span for shed roof a pair of rafters is called a couple. pitched roof rafter lengths - carpentry-tips-and-tricks.com pitched roof rafter lengths how to calculate the length of common rafters. once the wall plates are square and you have measured the span, you are ready to set-out and cut the common rafter lengths. source: peter4gov.org. Span tables for joists and rafters 3 american forest & paper association table 9.1 required compression perpendicular to grain design values (f c?) in pounds per square inch for simple span joists and rafters with uniform load. bearing length, in. span, ft 1.5 2.0 2.5 3.0 3.5 2 30 22181513 4 59 44363025 6 89 67534438 8 119 89 71 59 51 10 148.
Boxspan
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