Minimum Roof Pitch Degrees

Minimum required roof slope for roofing materials.

Minimum roof pitch degrees.

Shingles of all types need to have a slope to function properly. 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. 9 46 built up roof asphalt. The standard of lower pitch actually ranges between 1 12 to 5 12.

18 43 asphalt shingles with special underlayment requirements 2 in 12. How do you calculate the slope of a roof. With regards to the pitch the building standard code bs 5534 recommends a minimum pitch of 20 0 for slate roofs. In 12 0 25 in 12 1 19 built up roof coal tar pitch.

Asphalt shingles continue to be the most widely installed roof covering option in north america. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. Minimum roof pitch for shingles. As you state the roofing manufacturers provide minimum roof pitches of 2 degrees lysaght trimdek and stramit monoclad even with long run lengths.

Roof pitch degree table. The minimum requirement is 2 12. The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. Roofing material or system.

That works out to about nine degrees if that works better for you. What is the minimum pitch slope of an asphalt shingle roof. You write the pitch assuming a run of 12 inches thus the ratio would describe how much a roof rises for each foot of the run. As aforementioned there is no standard pitch of a roof.

The minimum pitch is typically 3 12 meaning the roof should rise 3 inches for every 12 inches of horizontal foot. Minimum required slope x in 12 minimum required slope degrees asphalt shingles. It is uncommon to find a roof below 15 but for those very low pitch applications there are interlocking clay pantiles available suitable for use down to 12 5. Traditionally a minimum roof pitch of 20 was recommended in bs 5534 but modern tiles and slates have now been designed for applications as low as 15.

Anything above that will require you to put out higher cost because they are already considered as higher pitch. But the most commonly used pitches range between 4 12 and 9 12.