Asphalt shingles continue to be the most widely installed roof covering option in north america.
Minimum roof slope for shingles.
Low slope roofing shingles.
The minimum requirement is 2 12.
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.
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 2 12 number is rise over run or two units of vertical for every 12 units horizontal.
Manufacturers of asphalt shingles recommend a pitch of 4 12 or more but the absolute minimum pitch is 2 12.
This number corresponds to the number of inches of rise in a 12 foot run.
Low slope roofs present a challenge where water is concerned.
However those naysayers would be wrong.
There are differing opinions as to the minimum slope for a roof but the generally accepted minimum is 3 12.
Pitch is measured in inches of vertical rise of the roof over one foot 12 inches of horizontal run.
The minimum pitch for shingles is 1 6 which is equivalent to 4 inches rise to 24 inches run.
The recommended minimum roof pitch for shingles is 2 12 or simply two units of vertical rise to every twelve units of horizontal span.
The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.
The minimum pitch for a standing seam metal roof is 1 4 or 3 inches rise to 12 inches run.
What is the minimum pitch slope of an asphalt shingle roof.
Shingles of all types need to have a slope to function properly.
Asphalt shingles can only be installed on roof slopes of 2 12 or greater.
In 12 0 25 in 12 1 19 built up roof coal tar pitch.
That works out to about nine degrees if that works better for you.
So a 4 12 pitch roof rises 4 inches for every 12 inches of horizontal run.
Asphalt shingles minimum roof slope roof pitch r905 2 2.
Minimum required slope x in 12 minimum required slope degrees asphalt shingles.
Minimum required roof slope for roofing materials.
This means for every 12 horizontal units the roof must rise a minimum of 2 vertical units.
Minimum roof pitch for shingles it is important for shingle roofs to function properly and one method of ensuring that this is achieved is to observe the pitch requirements for the shingles.
18 43 asphalt shingles with special underlayment requirements 2 in 12.
Roofing material or system.
Residential low slope roofing can generally be divided up into two broad categories.
9 46 built up roof asphalt.
Some people recommend not installing asphalt shingles on slopes below 5 12 but a skilled roofer may well be able to make this work.
