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.. Shed roof framed with 2x6 span coffee tables and end table plans shed roof framed with 2x6 span bird house plans free download liscncecplste small two story house plans with garage plans for diy bunk beds modern bunk bed plans. doors - barn opportunities tend in order to major. to an absolutely easy accessibility.. 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.
Table 9.1 in span tables for joists and rafters (figure #5) gives a required compression value of 237 psi for a span of 16 feet and bearing length of 1.5 inches. (the tables permit a bearing length of up to 3.5 inches, but since 1.5 is probably the worst case that you’ll encounter for joist or rafter bearing, it’s a safe value.). Not sure how accurate my answer is (i may have over engineered my roofs, but having had 2 shed/workshops at my house collapse with snow because the person who built them before i bought the place did a lash up job with no ref to span tables by the looks of things) but based on span tables for a flat roof (i.e. a 5 to 10 degree slope from one side to the other on a 4 meter span you need. 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.
Komentar
Posting Komentar