Asphalt Roll Roofing Minimum Slope

Asphalt shingles can only be installed on roof slopes of 2 12 or greater.

Asphalt roll roofing minimum slope.

Asphalt shingles continue to be the most widely installed roof covering option in north america. The requirements for an asphalt shingles roof are contained in the international building code. What is the minimum slope for an asphalt shingle roof. Roofing material or system.

Low slope means that these products are installed on roof slopes of 2 12 or more. And are very easy to apply if instructions are followed correctly. 18 43 asphalt shingles with special underlayment requirements 2 in 12. 9 46 built up roof asphalt.

Minimum required slope x in 12 minimum required slope degrees asphalt shingles. This means for every 12 horizontal units the roof must rise a minimum of 2 vertical units. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. Considering the roof slope requirement is important.

The minimum slope is 4 12 for standard single ply underlayment installation. For slopes above 2 12 and less than 4 12 an underlayment of two 2 plies lapped 19 of astm d 226 or d 4869 type i or ii underlayment commonly referred to as15 or 30 base felt or equal is required. 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. Adequate drainage of water from the roof surface is essential.

Learn what the minimum slope for an asphalt shingle roof is the difference between sloped and flat roofs and how to calculate the slope of any roof. A minimum slope of 2 inches per foot is required for the use of mrs. The minimum slope for an asphalt shingle roof is 2 12. According to this code the minimum slope for asphalt shingles is 17 degrees or two vertical units to twelve units in the horizontal.

Most steep slope and low slope roofing materials are designed for use as water shedding systems. It essentially has a sheet you nail down then a sheet you glue down ontop or some systems even include a peel off backing to be applied to the nailed base. In 12 0 25 in 12 1 19 built up roof coal tar pitch. For example if it is a very low slope water including snowmelt or rainwater drains slowly and this increases the chances of lateral water movement around the shingles.

Also if asphalt shingles are installed on a roof slope of 2 12 to 4 12 it shall be provided with a double underlayment application. Minimum slope for asphalt shingles. This is an inexpensive roofing material often installed over 15 felt underlayment by homeowners and do it yourself ers. Roll roofing is simplest product to install on a small section of low slope roof is 90 pound roll roofing.

Asphalt roll roofing installation. These water shedding systems are not impermeable and they rely on slope to shed water off the roof surface.