Minimum Roof Slope For 3 Tab Shingles

Or the colon can replace the slash as in 2 12 or 7 12.

Minimum roof slope for 3 tab shingles.

Normal shingle installation is allowed for all roofs with a pitch of 4 12 and above. Some people recommend not installing asphalt shingles on slopes below 5 12 but a skilled roofer may well be able to make this work. We do install shingles on these in between. 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.

Low sloped roof shingle installation. There are differing opinions as to the minimum slope for a roof but the generally accepted minimum is 3 12. Normal roof slope for typical installation. 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. This number corresponds to the number of inches of rise in a 12 foot run. 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. Roof pitch designations are comprised of two numbers indicating a ratio.

For those who don t understand the roof pitch number here is a way to envision it. Therefore the asphalt manufactures base their warranties around the minimum recommended pitch of 4 in 12. Roof pitch defined and explained. Asphalt composition shingles are designed to be installed on roof slopes greater than a 4 in 12 pitch.

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. With regards to the pitch the building standard code bs 5534 recommends a minimum pitch of 20 0 for slate roofs. 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.

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. Owens corning supreme 33 33 sq ft shasta white 3 tab roof shingles. Item 12061 model sa12. The ratio can be indicated by a division slash separating the numbers such as 2 12 or 7 12.