Minimum Pitch For Slope Roof

The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.

Minimum pitch for slope roof.

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. Note that roof pitch is sometimes used in parallel with roof slope. 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.

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. I e 4 inches of rise per 12 inches one foot of run. The minimum requirement is 2 12. The 2 12 number is rise over run or two units of vertical for every 12 units horizontal.

The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run. With regards to the pitch the building standard code bs 5534 recommends a minimum pitch of 20 0 for slate roofs. That works out to about nine degrees if that works better for you. The standard of lower pitch actually ranges between 1 12 to 5 12.

However roof pitch is technically measured and defined differently. However you can only use this pitch with built up roofing or specialized synthetic roofing.