Minimum Pitch For Slope Roof

The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.

Minimum pitch for slope roof.

I e 4 inches of rise per 12 inches one foot of run. The minimum requirement is 2 12. However roof pitch is technically measured and defined differently. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.

But since there is still a wide variety of slate roofing systems there are occasions when the minimum pitch can go down to as low as 15 0 depending on the uniqueness of the roof. The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. Shingles of all types need to have a slope to function properly. The metal roof minimum slope doesn t stray far from other building with different material.

However you can only use this pitch with built up roofing or specialized synthetic roofing. Note that roof pitch is sometimes used in parallel with roof slope. What is the minimum pitch slope of an asphalt shingle roof. If a roof slope rises say 4 inches when measured 12 inches along the bottom of a horizontal roof truss the roof slope is said to be 4 12.

That works out to about nine degrees if that works better for you. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.