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