how to calculate the roof pitch
For hip roof porch extensions from an existing building wall you can use half the calculator results. This table gives the hip and valley factor or multiplier for a large number of roof pitches as well as the equation for finding the factor.
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Enter the extension wall length into Wall Length and double the extension wall width then minus ridge thickness into the Wall Width entries.

. Minus ridge thickness to allow for ridge becoming pole plate - roof peak will be slightly higher - Ridge Thick must be same as Common. You can use this chart to calculate the length of hip or valley rafters. The factor is multiplied by the run of a common rafter to determine the length of a hip or valley rafter.
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