So a 4 12 pitch roof rises 4 inches for every 12 inches of horizontal run.
Minimum roof pitch for shingles.
That works out to about nine degrees if that works better for you.
Manufacturers of asphalt shingles recommend a pitch of 4 12 or more but the absolute minimum pitch is 2 12.
They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends.
Mineral surfaced roll roofing requires a minimum roof pitch of 1 12 or greater.
Metal roof shingles require a minimum roof pitch of 3 12 or greater.
What is the minimum pitch slope of an asphalt shingle roof.
Slate and slate type shingles require a minimum roof pitch of 4 12 or greater.
Wood shingles require a minimum roof pitch of 3 12 or greater.
Shingles of all types need to have a slope to function properly.
Tuesday september 11 2018.
What is the minimum slope for an asphalt shingle roof.
Wood shakes require a minimum roof pitch of 3 12 or greater.
Asphalt shingles continue to be the most widely installed roof covering option in north america.
The minimum requirement is 2 12.
The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.
The 2 12 number is rise over run or two units of vertical for every 12 units horizontal.