Roof area calculation


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Old 11-07-06, 10:02 AM
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Roof area calculation

Getting ready to roof my new addition. Is there an easy way to calculate the area. The addition has a gable roof: 25' x 28' with 16" overhangs and a roof slope of 8/12. Trying to figure out how many bundles of shingles to order.
 
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Old 11-07-06, 10:27 AM
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The easiest way is to actually measure the area to be roofed. Length x width = total area in sq. ft. Divide sq ft by 100 to get the total amount of "squares" Most shingles are 3 bundles to the square. And calculate some extra for waste.

If you can still see the plywood, you can guestimate how big the roof is based on the size of those 4x8 sheets.
 
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Old 12-02-06, 01:34 AM
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Originally Posted by CougGuy
Getting ready to roof my new addition. Is there an easy way to calculate the area. The addition has a gable roof: 25' x 28' with 16" overhangs and a roof slope of 8/12. Trying to figure out how many bundles of shingles to order.
Yep just measure the roof. 8/12 is not too fun to measure though. If it's a new addition you should have some plans to measure from.
 
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Old 12-02-06, 09:30 AM
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Roof

On an 8/12 pitch, 1.21 x horizontal distance will give the sloped roof distance.
 
 

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