Minimum Roof Pitch Degrees

The minimum roof pitch for shedding snow is around 30 or a 6 12 or 7 12 slope although this is not a definite as the material of your roof the direction of the snow and wind are some factors that can affect whether or not snow will slide as roofs of as little as 10 have been reported to shed snow.

Minimum roof pitch degrees.

The minimum pitch is typically 3 12 meaning the roof should rise 3 inches for every 12 inches of horizontal foot. How do you calculate the slope of a roof. Roof pitch degree table. Minimum required slope x in 12 minimum required slope degrees asphalt shingles.

The standard of lower pitch actually ranges between 1 12 to 5 12. What is the minimum pitch slope of an asphalt shingle roof. Shingles of all types need to have a slope to function properly. 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.

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. Minimum pitch for corrugated metal roof. Roofing material or system. Minimum roof pitch for shingles.

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. 18 43 asphalt shingles with special underlayment requirements 2 in 12. 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 short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. Asphalt shingles continue to be the most widely installed roof covering option in north america. With regards to the pitch the building standard code bs 5534 recommends a minimum pitch of 20 0 for slate roofs. 9 46 built up roof asphalt.

As aforementioned there is no standard pitch of a roof. The minimum requirement is 2 12. Minimum required roof slope for roofing materials. But the most commonly used pitches range between 4 12 and 9 12.

In 12 0 25 in 12 1 19 built up roof coal tar pitch. As you state the roofing manufacturers provide minimum roof pitches of 2 degrees lysaght trimdek and stramit monoclad even with long run lengths.