Roof Pitch For A Flat Asphalt Shingles

Minimum required slope x in 12 minimum required slope degrees asphalt shingles.

Roof pitch for a flat asphalt shingles.

Armourfix and armourvalley membranes must be installed and extended 60 90 cm up the main roof underneath the shingles in order to assure a waterproof connection. Any slope that has a pitch less than 2 12 is too flat for shingles and should be covered with flat roof materials such as tpo pvc epdm rubber or others. But remember the lowest pitch accepted by most cities and counties for applying basic asphalt shingles is a 3 inch rise to a 12 inch run. The recommended minimum roof pitch for shingles is 2 12 or simply two units of vertical rise to every twelve units of horizontal span.

5 12 to 12 12 pitch. The starter strip and first row of shingles must be applied 25 cm from the bottom of the slope roof or main roof above the slope transition. Minimum required roof slope for roofing materials. How roof pitch determines suitable roofing systems.

The roof slope is only 1 12. With respect to shingle application roof slopes from 2 12 to less than 4 12 18 5 are called low slope roofs while roof slopes of 4 12 or greater are called normal or standard slopes. Asphalt shingles are an effective roof covering material for sloped roofs that can be successfully used on slopes as low as 2 12. Think of them as taking the middle road in terms of roof pitch not too flat not too steep.

The minimum pitch required for shingles is 2 12 which means for every 12 inches the roof rises 2 inches. In 12 0 25 in 12 1 19 built up roof coal tar pitch. Wood and slate shingles are used in many of the same types of roofs as asphalt composite shingles but may not be appropriate for roofs near the lower end. For that reason flat roofs are limited to these types of covering materials.

The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. 18 43 asphalt shingles with special underlayment requirements 2 in 12. Roofing material or system. 9 46 built up roof asphalt.

A roofer called me to report that his competition was finishing up a re roof project with asphalt shingles. Flat and nearly flat roofs a pitch of 1 in 12 or 2 in 12 cannot be covered with shingles or shakes of any material since there is not enough angle to combat the danger of blow off. It is important for shingle roofs to function properly and one method of ensuring that this is achieved is to observe the pitch requirements for the shingles. Asphalt shingles continue to be the most widely installed roof covering option in north america.

A very important detail is where the flat roof is connecting the pitch roof.