Minimum Roof Pitch For Asphalt Shingles

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.

Minimum roof pitch for asphalt shingles.

There are plenty of other options however for flat and nearly. For those who don t understand the roof pitch number here is a way to envision it. Clay and concrete tile requires a minimum roof pitch of 2 1 2 12 or greater. Asphalt shingles require a minimum roof pitch of 2 12 or greater.

Metal roof shingles require a minimum roof pitch of 3 12 or greater. What precautions need to be taken to install shingles on low slopes. The requirements for an asphalt shingles roof are contained in the international building code. Asphalt felt paper that is tacked to the roof sheathing.

All asphalt shingle roofs with a pitch of 4 12 or more have an underlayment of 15 lb. Considering the roof slope requirement is important. Why is 2 12 the minimum. That works out to about nine degrees if that works better for you.

The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. For example if it is a very low slope water including snowmelt or. Fortunately the requirements are quite accommodating. The minimum slope for an asphalt shingle roof is 2 12.

Asphalt composition shingles are designed to be installed on roof slopes greater than a 4 in 12 pitch. Shingles of all types need to have a slope to function properly. The minimum requirement is 2 12. Asphalt shingles continue to be the most widely installed roof covering option in north america.

The 2 12 number is rise over run or two units of vertical for every 12 units horizontal. What is the minimum pitch slope of an asphalt shingle roof. A roof slope of 2 12 up to but not including 4 12 is considered as low in residential construction. What slope is considered low slope for shingles.

The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. They won t be appropriate for all roofs. Minimum slope for asphalt shingles. According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal.

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. If you re having asphalt shingles put on your roof you will have to have a minimum slope. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. Let us recap on the minimum roof pitch required for each type of roofing material.

Therefore the asphalt manufactures base their warranties around the minimum recommended pitch of 4 in 12.