Gambrel Pitch Angles

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The Gambrel Pitch Angles computes the pitch angles and rafter lengths bases on the span, total height, and height and width of the loft.

INSTRUCTIONS: Choose units and enter the following:

(S) Span of Roof
(TH) Total Height
(LH) Loft Height
(LW) Loft Width

Gambrel Pitch Angles (P1 and P2): The calculator returns the following:

(P1) Lower Pitch Angle
(P2) Upper Pitch Angle
(z) Height of Gable above Loft
(LR) Lower Rafter Length
(UR) Upper Rafter Length
(B) Gambrel Angle

The Math / Science

The Attic Width must be less than the span.

`P1 = "atan"((AH)/((S-AW)"/"2))`

`P2 = "atan"( (TH-AH)/(AW"/"2) )`

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