Minimum Pitch For Slope Roof

With regards to the pitch the building standard code bs 5534 recommends a minimum pitch of 20 0 for slate roofs.

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

Note that roof pitch is sometimes used in parallel with roof slope. Shingles of all types need to have a slope to function properly. What is the minimum pitch slope of an asphalt shingle roof. The minimum pitch is typically 3 12 meaning the roof should rise 3 inches for every 12 inches of horizontal foot.

The minimum requirement is 2 12. 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. 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 following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. That works out to about nine degrees if that works better for you.