The minimum requirement is 2 12.
Min roof slope for shingles.
Minimum required slope x in 12 minimum required slope degrees asphalt shingles.
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.
So a 4 12 pitch roof rises 4 inches for every 12 inches of horizontal run.
Shingles of all types need to have a slope to function properly.
In 12 0 25 in 12 1 19 built up roof coal tar pitch.
This number corresponds to the number of inches of rise in a 12 foot run.
This means for every 12 horizontal units the roof must rise a minimum of 2 vertical units.
Pitch is measured in inches of vertical rise of the roof over one foot 12 inches of horizontal run.
Some people recommend not installing asphalt shingles on slopes below 5 12 but a skilled roofer may well be able to make this work.
Manufacturers of asphalt shingles recommend a pitch of 4 12 or more but the absolute minimum pitch is 2 12.
Asphalt shingles minimum roof slope roof pitch r905 2 2.
9 46 built up roof asphalt.
Therefore the asphalt manufactures base their warranties around the minimum recommended pitch of 4 in 12.
Match the roofing on the covered porch with the main roof.
The 2 12 number is rise over run or two units of vertical for every 12 units horizontal.
The minimum pitch for shingles is 1 6 which is equivalent to 4.
Roofing material or system.
18 43 asphalt shingles with special underlayment requirements 2 in 12.
That works out to about nine degrees if that works better for you.
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 pitch slope of an asphalt shingle roof.
Determine the minimum slope of the roof based on the roofing material.
Asphalt shingles continue to be the most widely installed roof covering option in north america.
There are differing opinions as to the minimum slope for a roof but the generally accepted minimum is 3 12.
Asphalt composition shingles are designed to be installed on roof slopes greater than a 4 in 12 pitch.
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.
Asphalt shingles can only be installed on roof slopes of 2 12 or greater.
Finding the right products for your low slope roof.
They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends.
Minimum required roof slope for roofing materials.
