For other grades and species and for other loading conditions, refer to the AWC STJR. Rafter spans shall be measured along the horizontal projection of the rafter. If you use the center line for your Rafter Length(L) calculation, remember to subtract half of the thickness of the Ridge from the Rafter Length(L) result from the Roof Pitch Calculator. Rafters shall be sized based on the rafter spans in Tables R802.4.1(1) through R802.4.1(8). Note that the diagram below shows the Rafter Run extending from the outside edge of the top plate (location of the inside of the bird's mouth) to the center line of the Ridge. The Ridge Height can be calculated using the same formula as the Ledger Height on a Shed Roof. Once you have verified the first rafter, you can use it as a template to lay out the remaining rafters.Ĭalculating rafter sizes and spacing is the same for a gable roof as it is for a shed roof. Roof framing is easy, right? Please verify all of the measurements before you start cutting rafters. Ledger Height (from the top of the slab) = Wall Height + Rafter Rise(M) + Y
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