Low Slope Roof Shingles

And by the way the manufacturers instructions i reviewed for the shingles i was interested in buying described installations down to a 2 12 pitch.

Low slope roof shingles.

The usual slope for asphalt shingles is a 4 or greater rise for every horizontal foot of run. This low slope application requires a double layer of 15 felt underlayment cemented together for a distance extending from the eaves up to a point 24 inches inside the interior wall line of the building. They typically had different underlayment recommendations for low slope roofs 2 12 to 4 12 pitches but that was about it. Some building codes allow as low as a 2 slope with asphalt shingles if additional steps are taken.

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. A 3 per foot slope is considered low but may be acceptable if a double layer of felt is used. Low slope roofing shingles. 3 tab shingles versus laminated shingles for low slope roof.

However those naysayers would be wrong. The acceptable underlayment installation options for low slopes are described in the canadian standards association asphalt shingle application standard csa a123 51 as follows. Shingles that are not self sealing must be hand sealed with asphalt roofing cement. Cover the entire low sloped roof area with a self adhered modified bituminous membrane that will act as an ice and water.

Low slope roofs present a challenge where water is concerned.