Minimum Roof Pitch Degrees

Minimum pitch for corrugated metal roof.

Minimum roof pitch degrees.

The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. Minimum required roof slope for roofing materials. The standard of lower pitch actually ranges between 1 12 to 5 12.

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. Roof pitch degree table. What is the minimum pitch slope of an asphalt shingle roof. That works out to about nine degrees if that works better for you.

As aforementioned there is no standard pitch of a roof. How do you calculate the slope of a 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. Minimum roof pitch for shingles.

9 46 built up roof asphalt. I do not see any ambiguity in their documentation regarding the minimum roof pitch or any other limitations of their recommendations. Minimum required slope x in 12 minimum required slope degrees asphalt shingles. 18 43 asphalt shingles with special underlayment requirements 2 in 12.

With regards to the pitch the building standard code bs 5534 recommends a minimum pitch of 20 0 for slate roofs. But the most commonly used pitches range between 4 12 and 9 12. 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.

As you state the roofing manufacturers provide minimum roof pitches of 2 degrees lysaght trimdek and stramit monoclad even with long run lengths. Roofing material or system. The minimum requirement is 2 12. 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.

The minimum pitch is typically 3 12 meaning the roof should rise 3 inches for every 12 inches of horizontal foot. Asphalt shingles continue to be the most widely installed roof covering option in north america.