The first thing to know about your roofing project.
2 12 roof asphalt shingles.
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Asphalt shingle manufacturers will warrant shingles installed on roof slopes as low as 2 12 when these special installation procedures are followed.
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The asphalt shingle manufactures recommend that you install asphalt shingles on a recommended minimum of 4 in 12 or greater however most manufactures will warrant their shingles down to a 2 in 12 pitch if the recommended installation method is used.
The 2 12 number is rise over run or two units of vertical for every 12 units horizontal.
Additional underlayment protection with special application methods are required when asphalt shingles are installed on a low slope roof following the manufacturer s application instructions.
And your family can remain in the home during the installation or repair.
Everything can be done at a distance.
What is the minimum pitch slope of an asphalt shingle roof.
Asphalt shingles shall only be used on roof slopes of two units vertical in 12 units horizontal 17 percent slope or greater.
Asphalt shingles should never be applied to roof slopes below 2 12 2 of vertical rise for every 12 of horizontal run or 9 5.
Self sticking rubberized asphalt products like grace ice water shield are acceptable but expensive substitutes for 15 felt.
The minimum requirement is 2 12.
A pitch of 2 12 is the minimum pitch for shingles made of asphalt so your roof just barely makes the cut off for one of the most popular roofing material options.
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Asphalt shingles continue to be the most widely installed roof covering option in north america.
What precautions need to be taken to install shingles.
A roof slope of 2 12 up to but not including 4 12 is considered as low in residential construction.
The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.