The 2 12 number is rise over run or two units of vertical for every 12 units horizontal.
2 12 roof asphalt shingles.
Asphalt shingle manufacturers will warrant shingles installed on roof slopes as low as 2 12 when these special installation procedures are followed.
Everything can be done at a distance.
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.
Installation on roof slopes below a 2 in 12 pitch is not recommended at all.
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Asphalt shingles continue to be the most widely installed roof covering option in north america.
Shingles of all types need to have a slope to function properly.
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A roof slope of 2 12 up to but not including 4 12 is considered as low in residential construction.
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 should never be applied to roof slopes below 2 12 2 of vertical rise for every 12 of horizontal run or 9 5.
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The minimum requirement is 2 12.
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.
Self sticking rubberized asphalt products like grace ice water shield are acceptable but expensive substitutes for 15 felt.
The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.
What is the minimum pitch slope of an asphalt shingle roof.
Thanks to digital technology all of your decisions and interactions from selecting the right roofer to choosing a shingle to paying the contractor can be done at a distance.
Asphalt shingles shall only be used on roof slopes of two units vertical in 12 units horizontal 17 percent slope or greater.