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