The National Roofing Contractors Association recommends that asphalt shingles be installed only on roofs with slopes that are 3/12 and greater.Click to see full answer. Also know, can you Shingle a 3/12 pitch roof? Low Sloped Roof Shingle Installation 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? You are required to have a double layer of asphalt saturated felt paper or a single layer of ice & water shield under your shingles.Furthermore, can you put shingles on a low pitch roof? Asphalt shingles are an effective roof covering material for sloped roofs. They can be successfully used on slopes as low as 2:12 (2” of vertical rise for every 12” of horizontal run, or 9.5° ) as well as steeper pitches. People also ask, what is the minimum pitch for composition shingles? 4 in 12 pitch Can you put 3 layers of shingles on a roof? Advantages of Reroofing Most building codes allow two layers of organic or fiberglass asphalt shingles on roofs with a 4/12 pitch or less, and three layers on steeper roofs. If the structure can support the added weight, a typical 20-square (2,000-square-foot) reroof will cost at least $1,000 less than a tear-off job.
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