Take the length of the building (the direction the rafter are run) and multiply by the rise of the slope you want and it will tell you how high the high side will be. Like in the example 5' wide building with a 3/12 pitch 5*3=15"
I have a 4x8 with a 3/12 pitch slant roof and the low and high sides are the 8' long ones. It's under trees and fallen tree bits tend to accumulate. Once in a while, I have to get the push broom out and sweep the roof. But, water runs well and there's only a foot of difference between the low and high side.What if you are only building a 4' X 8' coop? All I want is enough slope to drain water off the top.
What if you are only building a 4' X 8' coop? All I want is enough slope to drain water off the top.