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.
Minimum roof slope for shingles.
18 43 asphalt shingles with special underlayment requirements 2 in 12.
They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends.
Asphalt shingles continue to be the most widely installed roof covering option in north america.
The recommended minimum roof pitch for shingles is 2 12 or simply two units of vertical rise to every twelve units of horizontal span.
Finding the right products for your low slope roof.
Minimum required roof slope for roofing materials.
Asphalt shingles minimum roof slope roof pitch r905 2 2.
The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.
There are differing opinions as to the minimum slope for a roof but the generally accepted minimum is 3 12.
Manufacturers of asphalt shingles recommend a pitch of 4 12 or more but the absolute minimum pitch is 2 12.
Roofing material or system.
Pitch is measured in inches of vertical rise of the roof over one foot 12 inches of horizontal run.
This number corresponds to the number of inches of rise in a 12 foot run.
Shingles of all types need to have a slope to function properly.
Residential low slope roofing can generally be divided up into two broad categories.
Low slope roofing shingles.
In 12 0 25 in 12 1 19 built up roof coal tar pitch.
9 46 built up roof asphalt.
Minimum required slope x in 12 minimum required slope degrees asphalt shingles.
This means for every 12 horizontal units the roof must rise a minimum of 2 vertical units.
Larger flat roofed applications low slope such as residential condominium complexes row homes and town houses and smaller applications such as residential porch and garage transitions from the main home where the slope of the roof changes dramatically.
The minimum pitch for shingles is 1 6 which is equivalent to 4 inches rise to 24 inches run.
Asphalt shingles can only be installed on roof slopes of 2 12 or greater.
However those naysayers would be wrong.
What is the minimum pitch slope of an asphalt shingle roof.
Some people recommend not installing asphalt shingles on slopes below 5 12 but a skilled roofer may well be able to make this work.
Some will argue that shingles shouldn t be used for low pitch roofs at all.
That works out to about nine degrees if that works better for you.
Low slope roofs present a challenge where water is concerned.
The minimum requirement is 2 12.
The 2 12 number is rise over run or two units of vertical for every 12 units horizontal.
