Roof Pitch For A Flat Asphalt Shingles

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.

Roof pitch for a flat asphalt shingles.

A roofer called me to report that his competition was finishing up a re roof project with asphalt shingles. 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. 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.

The roof slope is only 1 12. 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. Minimum required roof slope for roofing materials.

The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. The recommended minimum roof pitch for shingles is 2 12 or simply two units of vertical rise to every twelve units of horizontal span. 9 46 built up roof asphalt. A very important detail is where the flat roof is connecting the pitch roof.

Minimum required slope x in 12 minimum required slope degrees asphalt shingles. Asphalt shingles continue to be the most widely installed roof covering option in north america. Roofing material or system. 5 12 to 12 12 pitch.

They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. 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. 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.

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. 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. Think of them as taking the middle road in terms of roof pitch not too flat not too steep. 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.

How roof pitch determines suitable roofing systems.