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.
2 12 roof asphalt shingles.
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The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.
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Shingles of all types need to have a slope to function properly.
Resilient asphalt shingles lie much flatter to the substrate than slate tile and concrete which keeps water from being easily blown under them.
The first thing to know about your roofing project.
Asphalt shingles continue to be the most widely installed roof covering option in north america.
Everything can be done at a distance.
A roof slope of 2 12 up to but not including 4 12 is considered as low in residential construction.
The 2 12 number is rise over run or two units of vertical for every 12 units horizontal.
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Self sticking rubberized asphalt products like grace ice water shield are acceptable but expensive substitutes for 15 felt.
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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.
The minimum requirement is 2 12.
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.
What precautions need to be taken to install shingles.
And your family can remain in the home during the installation or repair.
Installation on roof slopes below a 2 in 12 pitch is not recommended at all.
Asphalt shingle manufacturers will warrant shingles installed on roof slopes as low as 2 12 when these special installation procedures are followed.