Minimum Roof Slope For 3 Tab Shingles

Low sloped roof shingle installation.

Minimum roof slope for 3 tab shingles.

Therefore the asphalt manufactures base their warranties around the minimum recommended pitch of 4 in 12. The ratio can be indicated by a division slash separating the numbers such as 2 12 or 7 12. We do install shingles on these in between. For those who don t understand the roof pitch number here is a way to envision it.

If 4 12 and above is normal and 2 12 is minimum what about properties with roofs in between the two such as a 3 12 pitched roof. Some people recommend not installing asphalt shingles on slopes below 5 12 but a skilled roofer may well be able to make this work. With respect to shingle application roof slopes from 2 12 to less than 4 12 18 5 are called low slope roofs while roof slopes of 4 12 or greater are called normal or standard slopes. Asphalt shingles are an effective roof covering material for sloped roofs that can be successfully used on slopes as low as 2 12.

I have heard of special methods being used for 3 tab asphalt shingle and low roof pitches less than 4 pitch that includes adhering the shingles and changing the reveal so that in the roofer would be nailing through 3 layers of shingles prevents wind lift off. Pitch is the term used to describe the angle slope or slant of your roof. Normal shingle installation is allowed for all roofs with a pitch of 4 12 and above. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.

Owens corning supreme 33 33 sq ft shasta white 3 tab roof shingles. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. Roof pitch defined and explained. Normal roof slope for typical installation.

Roof pitch designations are comprised of two numbers indicating a ratio. Learn what the minimum slope for an asphalt shingle roof is the difference between sloped and flat roofs and how to calculate the slope of any roof. This number corresponds to the number of inches of rise in a 12 foot run. Or the colon can replace the slash as in 2 12 or 7 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. 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. Item 12061 model sa12.