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