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Geoff Graham of Ken Thieneman Builder Inc. PRO asked:
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?
Bob Gallese of Acclaim Renovations & Design PRO answered:
May 7, 2019
I agree, no less than 4/12 but the sheathing must be layered 100% with Ice & Water memebrane first.
Darren Mason of D.K. Mason Roofing & Construction PRO answered:
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.
John Peil of JPS Roofing Solutions PRO answered:
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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