Posted by **Roofer** on Tuesday, March 12, 2013 at 6:20pm.

A gable roof with a slope of 9 inches per foot has a rake slope factor of 1.25. If the run is 10 feet and the eaves length is 30 feet. What is the roof area in sq feet. a 150 b 1500 c 300 or d 750

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**MathMate**, Tuesday, March 12, 2013 at 6:28pm
If the slope is 9 inches per foot (run), then the roof is 15" per foot run.

I suppose rake factor is the ratio of roof length to rise, which works out to 1.25 in this case.

The roof area (for one sloping face) is therefore

(15"/9")*10'*30' long

= 500 sq. ft.

If the roof has another sloping face, then double the above.

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