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Discussion Starter · #1 · (Edited)
I found this in the research I did a few years back when I started doing roofs thought it would help some others. Can't remimber where I got it from. But it is accuate.
For slopes of *****multiple the area by
4:12 ***************1.054
6:12 ***************1.118
8:12 ***************1.202
10:12 **************1.302
12:12 **************1.414


The slope of the roof is expressed as Rise:Run. A 4:12 roof rises 4 units vertically for each 12 units horizontally. This can be reasonably estimated by holding a ruler or tape measure at arms length while viewing the roof from the ground (from a distance, so that the angle up to the roof is not effecting the apparent ratio).



 

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Very beneficial, thanks. I always muliplied by 1.3, I think it was near. I also know of some who recommended growing by 1.5 according to your details that would be way to much.
 
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