Purlins following Ellipse intercept Main Roof

Purlin intercepts Main Roof Miter/Bevel Angle Calculator
Elliptic Dormer Sections
Elliptic Dormer intercepts Main Roof
Eyebrow Dormer with Sloped Ridge: Substitute Angles for Main Roof Angle
Purlins following Sloped Ridge Line intercept Main Roof

Elliptic Dormer intercepts Main Roof
Geometric determination of Tangent to Ellipse
Formula for Slope of Ellipse at any Point

Joe Bartok
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