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NOTE: This works for hip and gable roofs.
Calculating Roof Area from Plans
Calculating Common Rafters on Hip / Valley
Example: What is Square Feet in the Gable Area of a 50' wide building with a 12' Gable Height?
Example: What is the run of a building that has a 60' run? The Slope is 6:12
Example: What is the run of a building that has a 50' span?
Calculating the Gable Area of a Building
GA = Gable Height x Run
Calculating the Gable Height of a Building
GH = Run x Vertical Rise
Calculating the Run of a Building
Run = Span ÷ 2
Coverage Area per Roll of Felt (Underlayment)
Calculating Bundles of Roof Covering