Roof Pitch For A Flat Asphalt Shingles

Roofing material or system.

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. 18 43 asphalt shingles with special underlayment requirements 2 in 12. Asphalt shingles are an effective roof covering material for sloped roofs that can be successfully used on slopes as low as 2 12. 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.

Putting shingles on a flat roof is probably not the best way to go but in the event you decide you want shingles on your flat roof instead of shakes tile or metal here are a few good pointers to follow. In 12 0 25 in 12 1 19 built up roof coal tar pitch. 5 12 to 12 12 pitch. The roof slope is only 1 12.

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. The minimum pitch required for shingles is 2 12 which means for every 12 inches the roof rises 2 inches. 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. 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.

A roofer called me to report that his competition was finishing up a re roof project with asphalt shingles. 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. Asphalt shingles continue to be the most widely installed roof covering option in north america.

How roof pitch determines suitable roofing systems. 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. 9 46 built up roof asphalt. Minimum required roof slope for roofing materials.

A very important detail is where the flat roof is connecting the pitch roof. The recommended minimum roof pitch for shingles is 2 12 or simply two units of vertical rise to every twelve units of horizontal span. Think of them as taking the middle road in terms of roof pitch not too flat not too steep. Minimum required slope x in 12 minimum required slope degrees asphalt shingles.

For that reason flat roofs are limited to these types of covering materials.