How To Flash Vent In Flat Roof Modified Bitumen

Part 11 modified bitumen flashing details view email or download this pdf document.

How to flash vent in flat roof modified bitumen.

If your flat roof is covered with gravel you will likely need to hire a professional to reroof it. Get a sheet of bitumen roofing and roll it out allowing an extension beyond the perimeter of the roof. Make sure the roofing is flat and free from creases and bubbles. Only modified bitumen materials should be used.

In the images below we are flashing a curb with modified bitumen membrane torch down material. Iko commercial industrial products. The edge of the roof has thin metal flashing that helps water drip off the roof without damaging the home or causing a leak. Another popular method for flashing vent pipes is by using a rubber flange.

Flat roofs were once exclusively the province of professionals but new materials enable do it yourselfers to install flat roofs. A modified bitumen roof is an updated version of the flat asphalt roofing that is seen so much on commercial buildings the asphalt roofs had to have gravel and rock on top to hold them down because they actually sat on top of the roof and were not connected to the roof as would be a tile roof. Open valleys have metal flashing to protect this critical area of the roof. The vent pipes are usually 1 1 2 to 3 inches in diameter.

The same principle applies to a modified torch down roof. After attaching the felt to the roof use a primer to prepare the roofing. Sometimes we find that this principle is not practiced by other roofing contractors. Step 3 prime the roof.

While some skylight manufacturers include flashing in their products sometimes roofing professionals have to create it or purchase it separately. If the surface is smooth you may be able to reroof using sheets of modified bitumen or epdm rubber roofing. When installing shingles where the is a vent pipe you will install the shingles up to the bottom edge of the pipe. This type of flashing is more commonly used on metal roofs.