So a 4 12 pitch roof rises 4 inches for every 12 inches of horizontal run.
Min roof slope for shingles.
They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends.
This number corresponds to the number of inches of rise in a 12 foot run.
Pitch is measured in inches of vertical rise of the roof over one foot 12 inches of horizontal run.
Minimum required roof slope for roofing materials.
Roofing material or system.
This means for every 12 horizontal units the roof must rise a minimum of 2 vertical units.
In 12 0 25 in 12 1 19 built up roof coal tar pitch.
Residential low slope roofing can generally be divided up into two broad categories.
Minimum required slope x in 12 minimum required slope degrees 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.
Match the roofing on the covered porch with the main roof.
What is the minimum pitch slope of an asphalt shingle roof.
Asphalt shingles minimum roof slope roof pitch r905 2 2.
Determine the minimum slope of the roof based on the roofing material.
The recommended minimum roof pitch for shingles is 2 12 or simply two units of vertical rise to every twelve units of horizontal span.
9 46 built up roof asphalt.
That works out to about nine degrees if that works better for you.
The minimum pitch for shingles is 1 6 which is equivalent to 4.
The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.
Shingles of all types need to have a slope to function properly.
18 43 asphalt shingles with special underlayment requirements 2 in 12.
There are differing opinions as to the minimum slope for a roof but the generally accepted minimum is 3 12.
The 2 12 number is rise over run or two units of vertical for every 12 units horizontal.
Asphalt shingles continue to be the most widely installed roof covering option in north america.
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.
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.
Finding the right products for your low slope roof.
For those who don t understand the roof pitch number here is a way to envision it.
Some people recommend not installing asphalt shingles on slopes below 5 12 but a skilled roofer may well be able to make this work.
