With respect to shingle application roof slopes from 2 12 to less than 4 12 18 5 are called low slope roofs while roof slopes of 4 12 or greater are called normal or standard slopes.
Installation of asphalt shingles on low slope roofs.
The cabo one and two family dwelling code permits the installation of asphalt shingles on roofs with a slope as low as 2 12 if the shingles are double coverage self sealing versions.
The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.
How to install asphalt shingles on low slope roofs.
Low slope roofing materials choices costs life expectancy characteristics installation guidelines.
Asphalt shingles continue to be the most widely installed roof covering option in north america.
Low slope roofing material choices.
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A typical roof has three layers a felt layer and two layers of overlapping shingles.
Asphalt shingles are an effective roof covering material for sloped roofs that can be successfully used on slopes as low as 2 12.
Corresponding editor paul fisette replies.
Low slope roofs with gaf asphalt shingles.
It has just one layer so it goes.
How to install roll roofing on low slope roofs.
I have heard that asphalt shingles can be applied on a roof with a pitch as low as 2 12 as long as a rubberized asphalt eaves membrane is installed under the shingles.
If you have a low slope roof this is especially important.
Roll roofing is different.