Do not cut them according to a template you have been using for the common rafters. Remember that the heel cut, seat cut, and head cut for a hip and valley rafter will have angles that reflect this difference in slope. So where two roof sections intersect to form a 90° angle (a regular hip or valley), and each roof section has, for example, a 6-in-12 slope, the hip or valley rafter at that intersection will have a slope of 6-in-16.97.Įxpressing the same thing using degrees: the roof sections in the above example have a 26.57° slope, while the hip or valley rafter will have a 19.47° slope. While the slopes of the common rafters are expressed as “X-in-12″, the slope of the hip and valley rafter on the same roof will be “ X-in-16.97“. Where common rafters (the regular rafters) rise a certain distance over 12 inches, the hip or valley rafter will rise the same distance over 16.97 inches. This is because the hip or valley rafter has to rise the exact same total amount, from the height of the eaves to the height of the ridge, but it has to do it over a longer distance. The slope of the hip or valley rafter will be lower than the slope of the adjacent roof sections. On a related note, the pitch (properly the “slope”) of a hip or valley rafter will not be the same as the pitch of the adjacent roof sections. A roof valley! Hip and Valley Rafter Pitch is Different from the Roof Pitch
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