Low Slope Roof Shingles

A 3 per foot slope is considered low but may be acceptable if a double layer of felt is used.

Low slope roof shingles.

As well a slope of 4 12 is most commonly considered the lowest slope for standard shingle installations. Most manufacturer and industry recommendations require or at the very least recommend special underlayment or other considerations on roofs between 2 12 and 4 12. Low slope roofs present a challenge where water is concerned. 3 tab shingles versus laminated shingles for low slope roof.

Low slope roofing shingles. Some will argue that shingles shouldn t be used for low pitch roofs at all. The acceptable underlayment installation options for low slopes are described in the canadian standards association asphalt shingle application standard csa a123 51 as follows. If you have a low slope roof but would love to have a shingled look rather than other solutions like rolled sheet roofing you are in luck.

The usual slope for asphalt shingles is a 4 or greater rise for every horizontal foot of run. However those naysayers would be wrong. Some building codes allow as low as a 2 slope with asphalt shingles if additional steps are taken. Cover the entire low sloped roof area with a self adhered modified bituminous membrane that will act as an ice and water.

They typically had different underlayment recommendations for low slope roofs 2 12 to 4 12 pitches but that was about it.