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