Purlin intercepts Main Roof Miter and Bevel Angle Calculator Main Ridge and Dormer Ridge intercept = 90° Select Entry Mode : Rise / Run Pitch Angle Main Roof Rise = Main Roof Run = Dormer Rise = Dormer Run = Face perpendicular to Dormer Roof Saw Blade Bevel = Saw Miter Angle = Angle on the Stick = Face set in Dormer Roof Saw Blade Bevel = Saw Miter Angle = Angle on the Stick = Footprint Angles on Purlin Face adjoining Main Roof Plane Footprint Angle = Supplementary Angle = Sheathing Angles on Main Roof Plane Sheathing Angle = 12/x Sheathing Angle =

Purlin Compound Angle Formulas
Purlins following an Elliptic Arc
Purlins following a Sloped Ridge Line