What precautions need to be taken to install shingles on low slopes.
Min roof slope for asphalt shingles.
Minimum required roof slope for roofing materials.
They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends.
There are differing opinions as to the minimum slope for a roof but the generally accepted minimum is 3 12.
9 46 built up roof asphalt.
In 12 0 25 in 12 1 19 built up roof coal tar pitch.
But shingle roofing is not watertight in the sense that standing water or wind driven water on a low slope roof can work its way up between the laps which is the reason for the minimum 2 12 slope.
Asphalt composition shingles are designed to be installed on roof slopes greater than a 4 in 12 pitch.
The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.
Why is 2 12 the minimum.
For example if it is a very low slope water including snowmelt or.
For those who don t understand the roof pitch number here is a way to envision it.
Roofing material or system.
The requirements for an asphalt shingles roof are contained in the international building code.
Asphalt shingles can only be installed on roof slopes of 2 12 or greater.
For low slopes as well as any other slope your local building department should be contacted.
According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal.
This number corresponds to the number of inches of rise in a 12 foot run.
All asphalt shingle roofs with a pitch of 4 12 or more have an underlayment of 15 lb.
Asphalt felt paper that is tacked to the roof sheathing.
What is the minimum pitch slope of an asphalt shingle roof.
Considering the roof slope requirement is important.
What slope is considered low slope for shingles.
Asphalt shingles minimum roof slope roof pitch r905 2 2.
Minimum required slope x in 12 minimum required slope degrees asphalt shingles.
Shingles of all types need to have a slope to function properly.
Minimum slope for asphalt shingles.
Some people recommend not installing asphalt shingles on slopes below 5 12 but a skilled roofer may well be able to make this work.
The roof pitch between 2 12 and 4 12 is considered as a low pitch roof so shingles can be installed in the roof slope between 2 12 and 4 12.
The minimum requirement is 2 12.
A roof slope of 2 12 up to but not including 4 12 is considered as low in residential construction.
Asphalt shingles continue to be the most widely installed roof covering option in north america.
This means for every 12 horizontal units the roof must rise a minimum of 2 vertical units.
18 43 asphalt shingles with special underlayment requirements 2 in 12.
The minimum slope for an asphalt shingle roof is 2 12.
