Minimum Roof Slope For Shingles

Minimum required roof slope for roofing materials.

Minimum roof slope for shingles.

If you have a low slope roof but would love to have a shingled look rather than other solutions like rolled sheet roofing you are in. However those naysayers would be wrong. The minimum pitch for a standing seam metal roof is 1 4 or 3 inches rise to 12 inches run. This number corresponds to the number of inches of rise in a 12 foot run.

That works out to about nine degrees if that works better for you. The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. The minimum requirement is 2 12. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.

Roofing material or system. Low slope roofing shingles. Some will argue that shingles shouldn t be used for low pitch roofs at all. The minimum pitch for shingles is 1 6 which is equivalent to 4 inches rise to 24 inches run.

Some people recommend not installing asphalt shingles on slopes below 5 12 but a skilled roofer may well be able to make this work. Minimum roof pitch for shingles it is important for shingle roofs to function properly and one method of ensuring that this is achieved is to observe the pitch requirements for the shingles. In 12 0 25 in 12 1 19 built up roof coal tar pitch. 18 43 asphalt shingles with special underlayment requirements 2 in 12.

Finding the right products for your low slope roof. There are differing opinions as to the minimum slope for a roof but the generally accepted minimum is 3 12. Minimum required slope x in 12 minimum required slope degrees asphalt shingles. Shingles of all types need to have a slope to function properly.

Asphalt shingles continue to be the most widely installed roof covering option in north america. What is the minimum pitch slope of an asphalt shingle roof. Asphalt shingles can only be installed on roof slopes of 2 12 or greater. Larger flat roofed applications low slope such as residential condominium complexes row homes and town houses and smaller applications such as residential porch and garage transitions from the main home where the slope of the roof changes dramatically.

Asphalt shingles minimum roof slope roof pitch r905 2 2. Low slope roofs present a challenge where water is concerned. Pitch is measured in inches of vertical rise of the roof over one foot 12 inches of horizontal run. Manufacturers of asphalt shingles recommend a pitch of 4 12 or more but the absolute minimum pitch is 2 12.

So a 4 12 pitch roof rises 4 inches for every 12 inches of horizontal run. This means for every 12 horizontal units the roof must rise a minimum of 2 vertical units. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends.