Shed Roof Rafter Span Table

Span calculator for wood joists and rafters also available for the android os.

Shed roof rafter span table.

Also available for the android os. 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. Our premium pole barn kits come standard with pre engineered trusses but building rafters is another viable diy option for smaller span structures. The calculated spans assume fully supported members properly sheathed and nailed on the top edge of the joist or rafter.

Therefore for gable roofed sheds the rafter span table is indicating how far a rafter can span half of your shed s width. The rule of thumb is that the gusset should be twice the width of the wood you use for your rafters. Straight line interpolation shall be permitted for intermediate spans and design values. 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.

So roughly 7 8 long for a 2 4. Use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size. 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. 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.

Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall. For an 8 10 shed one sheet of plywood should be fine. These span tables assume installation of at least three joists or rafters that are spaced not more than 24 on center. You are going to cut out triangles that will cover the apex of each set of rafters.

Rafter spans for southern yellow pine douglas fir and eastern spruce. If you have a single sloped roof then the 11 span distance for 2 4 rafters o c.