Roof Slope For Asphalt Shingles

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Roof slope for asphalt shingles.

The minimum requirement is 2 12. What are gaf asphalt shingles. The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. Some people recommend not installing asphalt shingles on slopes below 5 12 but a skilled roofer may well be able to make this work.

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. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. You can measure the roof slope either using tape or smartphone applications. 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.

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. The maximum slope considered suitable for normal shingle application is 45 degrees or 12 per foot. Minimum required roof slope for roofing materials.

There are differing opinions as to the minimum slope for a roof but the generally accepted minimum is 3 12. Installation on roof slopes below a 2 in 12 pitch is not recommended at all. The asphalt shingle roof contractors provide pitch estimator cards to measure the roof slope. 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.

Shingles of all types need to have a slope to function properly. 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. This means for every 12 horizontal units the roof must rise a minimum of 2 vertical units.

This number corresponds to the number of inches of rise in a 12 foot run. 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. At nelson contracting we proudly offer and install gaf asphalt shingles for both high and low pitch roofs. What is the minimum pitch slope of an asphalt shingle roof.

What is the minimum slope for an asphalt shingle roof. If a roof slope exceeds this limitation the shingles should be applied by the following recommended method complying with astm d4586. 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. 18 43 asphalt shingles with special underlayment requirements 2 in 12.

Asphalt shingles can only be installed on roof slopes of 2 12 or greater. Minimum roof slope roof pitch r905 2 2. Roofing material or system.