![]() 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 Wall Height: 96 inches (assuming an 8-foot wall).Now that the 'Y' height is known, you have the data you need in order to calculate the Ledger Height. ![]() Using the Rafter Span Tables on, you can see that 2圆 rafters (Southern Pine #2 Grade), spaced 16 inches apart, will span 8-5 (8 feet - 5 inches). ![]()
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