How To Install Vent Flashing Flat Roof

Use roofing nails to install the l shaped flashing flush with the roof and wall then cover it with roofing cement and reattach the roofer s felt.

How to install vent flashing flat roof.

Flat roof flashing is also installed around the perimeter of the roof to protect the underside of shingles. Step flashing on roof peak. Then nail the new l shaped flashing under the builder s felt but above the fascia board. Begin by removing the shingles at the affected area and removing old flashing if present.

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. 1 remove nails holding down shingles above the pip. Look for the chimney or any type of pipe coming out of the building.

Next hammer in a nail every few inches to secure the vent to your roofing structure. Slip a flat bar under the edge of the vent flashing and pop the nails up photo 1. Most metal shingles will be attached to the roof using metal shingle. Look for any type of vents as well.

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. Slide the new flashing over the vent pipe and under the shingles above the pipe. Pull the old flashing up over the vent pipe and scrape any old caulk and debris off the roof.

Bend the corner flashing tightly around the corner. Locate all of the areas around the flat roof where water can potentially enter. Use one roofing nail in each corner of the flashing to secure it to the roof. Turn your vent upside down and apply a thick bead of caulk to the flange.

Add a large bead of caulk in a half moon shape around the flashing and put the shingles back in place.