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. The standard of lower pitch actually ranges between 1 12 to 5 12. But the most commonly used pitches range between 4 12 and 9 12. The minimum requirement is 2 12.

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

Minimum required slope x in 12 minimum required slope degrees asphalt shingles. 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. The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. As you state the roofing manufacturers provide minimum roof pitches of 2 degrees lysaght trimdek and stramit monoclad even with long run lengths.

With regards to the pitch the building standard code bs 5534 recommends a minimum pitch of 20 0 for slate roofs. Roof pitch degree table. That works out to about nine degrees if that works better for you. In 12 0 25 in 12 1 19 built up roof coal tar pitch.

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. Roofing material or system. Anything above that will require you to put out higher cost because they are already considered as higher pitch. I do not see any ambiguity in their documentation regarding the minimum roof pitch or any other limitations of their recommendations.

How do you calculate the slope of a roof. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.