What is the minimum slope for an asphalt shingle roof.
Roof slope for asphalt shingles.
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.
Minimum roof slope roof pitch r905 2 2.
If a roof slope rise is 4 inches when measured 12 inches along the bottom of the horizontal run the roof slope is said to be 4 12.
Asphalt shingles can only be installed on roof slopes of 2 12 or greater.
What are gaf asphalt shingles.
Asphalt shingles continue to be the most widely installed roof covering option in north america.
In 12 0 25 in 12 1 19 built up roof coal tar pitch.
This number corresponds to the number of inches of rise in a 12 foot run.
The minimum requirement is 2 12.
You can measure the roof slope either using tape or smartphone applications.
Shingles of all types need to have a slope to function properly.
What is the minimum pitch slope of an asphalt shingle roof.
18 43 asphalt shingles with special underlayment requirements 2 in 12.
The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.
The asphalt shingle roof contractors provide pitch estimator cards to measure the roof slope.
Minimum required roof slope for roofing materials.
Roofing material or system.
That works out to about nine degrees if that works better for you.
Some people recommend not installing asphalt shingles on slopes below 5 12 but a skilled roofer may well be able to make this work.
9 46 built up roof asphalt.
The 2 12 number is rise over run or two units of vertical for every 12 units horizontal.
If a roof slope exceeds this limitation the shingles should be applied by the following recommended method complying with astm d4586.
Minimum required slope x in 12 minimum required slope degrees asphalt shingles.
Gaf asphalt shingles combined with the proper underlayment make ideal low slope roof shingles that do an excellent job of preventing water build up and leaking.
There are differing opinions as to the minimum slope for a roof but the generally accepted minimum is 3 12.
They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends.
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.
Secure the shingle to the roof deck with fasteners as recommended by the roofing manufacturer.
The maximum slope considered suitable for normal shingle application is 45 degrees or 12 per foot.
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.
Installation on roof slopes below a 2 in 12 pitch is not recommended at all.
