Minimum Pitch For Slope 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.

Minimum pitch for slope roof.

The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. However roof pitch is technically measured and defined differently. The metal roof minimum slope doesn t stray far from other building with different material. The standard of lower pitch actually ranges between 1 12 to 5 12.

What is the minimum pitch slope of an asphalt shingle roof. 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. The minimum pitch is typically 3 12 meaning the roof should rise 3 inches for every 12 inches of horizontal foot. With regards to the pitch the building standard code bs 5534 recommends a minimum pitch of 20 0 for slate roofs. Shingles of all types need to have a slope to function properly.

The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run. I e 4 inches of rise per 12 inches one foot of run.