Shed Roof Rafter Span Table

For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. If you have a single sloped roof then the 11 span distance for 2 4 rafters o c. The spans in this table are based on a maximum supported rafter span of 16 feet where the supported span is the total horizontal distance spanned by the roof rafters divided in half not the diagonal distance or the length of the rafter.

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Shed roof rafter span table.

You are going to cut out triangles that will cover the apex of each set of rafters. Straight line interpolation shall be permitted for intermediate spans and design values. For an 8 10 shed one sheet of plywood should be fine. Maximum rafter spans for a patio roof in areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot.

These span tables assume installation of at least three joists or rafters that are spaced not more than 24 on center. Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall. The calculated spans assume fully supported members properly sheathed and nailed on the top edge of the joist or rafter. Our premium pole barn kits come standard with pre engineered trusses but building rafters is another viable diy option for smaller span structures.

Means that your shed should be no wider or longer depending on how you orientate your single sloped roof than 11. So this table could accommodate a house with a total rafter span or house width of 32 feet. Use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size. The rule of thumb is that the gusset should be twice the width of the wood you use for your rafters.

Therefore for gable roofed sheds the rafter span table is indicating how far a rafter can span half of your shed s width. Also available for the android os. Span calculator for wood joists and rafters also available for the android os. Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run.

So roughly 7 8 long for a 2 4. Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch.

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