Low Slope Roof Shingles

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

Low slope roof shingles.

However those naysayers would be wrong. 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. 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. As well a slope of 4 12 is most commonly considered the lowest slope for standard shingle installations.

Some building codes allow as low as a 2 slope with asphalt shingles if additional steps are taken. The usual slope for asphalt shingles is a 4 or greater rise for every horizontal foot of run. Shingles that are not self sealing must be hand sealed with asphalt roofing cement. Low slope roofs present a challenge where water is concerned.

Cover the entire low sloped roof area with a self adhered modified bituminous membrane that will act as an ice and water. 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. Low slope roofing shingles.

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