The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.
Minimum roof pitch for shingles.
Tuesday september 11 2018.
Metal roof shingles require a minimum roof pitch of 3 12 or greater.
Wood shakes require a minimum roof pitch of 3 12 or greater.
The minimum requirement is 2 12.
The 2 12 number is rise over run or two units of vertical for every 12 units horizontal.
What is the minimum pitch slope of an asphalt shingle roof.
However it is regrettable that many installers usually ignore this requirement due to the desire for a quick installation process.
Wood shingles require a minimum roof pitch of 3 12 or greater.
That works out to about nine degrees if that works better for you.
Mineral surfaced roll roofing requires a minimum roof pitch of 1 12 or greater.
The recommended minimum roof pitch for shingles is 2 12 or simply two units of vertical rise to every twelve units of horizontal span.
What is the minimum slope for an asphalt shingle roof.
Slate and slate type shingles require a minimum roof pitch of 4 12 or greater.
They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends.
So a 4 12 pitch roof rises 4 inches for every 12 inches of horizontal run.
Asphalt shingles continue to be the most widely installed roof covering option in north america.