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Mar 25, 2019
What is the minimum pitch for a slate roof?
I'm contemplating a slate roof for the new building. The main structure's roof is 8:12, and I'd like to continue with slate for the porches, which will have a much shallower pitch. The building will be in the Western North Carolina mountains in an area that gets regular snow (less than a foot each snowfall, and generally under six inches) and above average rain (about 70 inches per year). Is 3:12 adequate?
Mar 25, 2019

Recommended not less than 4:12 pitch. Also would advise in Western NC to install ice & water guard in place of standard underlayment.

Mar 27, 2019

The minimum pitch for an asphalt roof for Asphalt shingles is 2/12 or more as long as you use at least one layer of ice and water shield and one layer of synthethic felt under the architectural shingles.  I would never use a three tab shingle on this low pitch roof.   Below 2/12 pitch, I would use either an EDPM Membrane or the Resisto 2 0r 3 ply roll roofing membrane system.

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