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