The Interface Angle calculator computes the outer angle made by two intersecting right triangles defined by their pitch.
INSTRUCTIONS: Enter the following:
- (P1) Pitch 1
- (P2) Pitch 2
Interface Angle (B): The calculator returns the angle in degrees. However, this can be automatically converted to compatible units via the pull-down menu.
The Math / Science
The formula for the exterior angle of intersection of two right triangles is:
B = π + P1 - P2
where:
- B = Interface Angle
- P1 = Angle 1
- P2 = Angle 2
Note: P1 and P2 are two pitches. They are converted to radian angles.
- Pitch to Slope: This converts pitch (e.g., 4/12) to slope.
- Pitch to Angle: This converts pitch (e.g., 10/12) to an angle in degrees.
- Rise over Run to Angle: This converts rise over run to an angle in degrees.
- Gambrel Angle: Computes the bend at the intersection of two slope as in a gambrel roof.
- Interface Angle: This computes the interface angle between two sloped surfaces.
- Interface Angle from Rise over Run: This computes the interface angle based on two rises and runs.
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- Double Hip Roof Geometries: This compute the lengths of the dimensional lines where one hip roof intersects another such as in a dormer.
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- Gambrel Rafter Lengths. This computes the upper and lower rafter lengths, attic width and total height under a gambrel roof based on the upper and lower pitch, span and loft height.
- Rafter Length: This computes the length of the rafters based on the span, pitch and overhang.
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Roofing Calculators