Shed Roof Rafter Span Table

Rafter span tables use these tables to determine lengths sizes and spacing of rafters.

Shed roof rafter span table.

You are going to cut out triangles that will cover the apex of each set of rafters. If you have a single sloped roof then the 11 span distance for 2 4 rafters o c. 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. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements.

These span tables assume installation of at least three joists or rafters that are spaced not more than 24 on center. Means that your shed should be no wider or longer depending on how you orientate your single sloped roof than 11. Straight line interpolation shall be permitted for intermediate spans and design values. More roof calculators roof truss calculator how to cut rafters.

So this table could accommodate a house with a total rafter span or house width of 32 feet. 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. Span calculator for wood joists and rafters also available for the android os. For an 8 10 shed one sheet of plywood should be fine.

So roughly 7 8 long for a 2 4. This rafter span calculator is species specific for douglas fir hemlock etc. This is based upon the span of the rafter horizontal span not total rafter length live and dead loads. The calculated spans assume fully supported members properly sheathed and nailed on the top edge of the joist or rafter.

Also available for the android os. To size joists and rafters use the maximum span tables for southern yellow pine. The rule of thumb is that the gusset should be twice the width of the wood you use for your rafters.