How To Install Vent Flashing Flat Roof

Use one roofing nail in each corner of the flashing to secure it to the roof.

How to install vent flashing flat roof. Lay the starter row of metal shingles at the drip edge and affix to the roof with metal roofing nails. Most metal shingles will be attached to the roof using metal shingle. Slide the new flashing over the vent pipe and under the shingles above the pipe. If you do not wish to form your own corner flashing you can buy pre bent pieces and cut them to size or use a piece of corrugated aluminum which is easier to bend.

Slide the top and sides of your vent underneath the surrounding shingles and leave the bottom side of the vent exposed and laying over the shingles. Locate all of the areas around the flat roof where water can potentially enter. Pull the old flashing up over the vent pipe and scrape any old caulk and debris off the roof. Step flashing on roof peak.

Work up from the initial row starting at the lower corner in a diagonal pattern staggering the shingles to prevent gaps. Look for any type of vents as well. Begin by removing the shingles at the affected area and removing old flashing if present. Slip a flat bar under the edge of the vent flashing and pop the nails up photo 1.

Next hammer in a nail every few inches to secure the vent to your roofing structure. This can be a source for anything from smoke to steam. Now that the old flashing is gone you can slide the new flashing over the pipe vent and maneuver it under the shingles above the pipe. Turn your vent upside down and apply a thick bead of caulk to the flange.

Then nail the new l shaped flashing under the builder s felt but above the fascia board. 1 remove nails holding down shingles above the pip. Add a large bead of caulk in a half moon shape around the flashing and put the shingles back in place. Look for the chimney or any type of pipe coming out of the building.

Roof shingle over step flashing.