Roof Pitch For A Flat Asphalt Shingles

The roofer making the complaint said that he bid that job and lost to a lower bidder while thinking that the only suitable materials would include mule hide epdm or high rib steel.

Roof pitch for a flat asphalt shingles.

Roofing material or system. The recommended minimum roof pitch for shingles is 2 12 or simply two units of vertical rise to every twelve units of horizontal span. 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. In 12 0 25 in 12 1 19 built up roof coal tar pitch.

How roof pitch determines suitable roofing systems. 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. 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. 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.

The minimum pitch required for shingles is 2 12 which means for every 12 inches the roof rises 2 inches. Minimum required slope x in 12 minimum required slope degrees asphalt shingles. 18 43 asphalt shingles with special underlayment requirements 2 in 12. A roofer called me to report that his competition was finishing up a re roof project with asphalt shingles.

Think of them as taking the middle road in terms of roof pitch not too flat not too steep. A very important detail is where the flat roof is connecting the pitch roof. Asphalt shingles are an effective roof covering material for sloped roofs that can be successfully used on slopes as low as 2 12. 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.

They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. For that reason flat roofs are limited to these types of covering materials. 9 46 built up roof asphalt.

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. Minimum required roof slope for roofing materials. The roof slope is only 1 12. Asphalt shingles continue to be the most widely installed roof covering option in north america.

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.