How To Install Vent Pipe Flashing On Flat Existing Roof

Put one nail in the bottom edge with a dab of caulk under it to seal the.

How to install vent pipe flashing on flat existing roof. Hammer the nails into the top and sides of the flashing. Use one roofing nail in each corner of the flashing to secure it to the roof. I ve used this repair on several roofs over the years. In simplest terms a new vent pipe boot flashing is slid over the top of the existing one and the top edge of the pan is lapped beneath the overlying shingle course.

Finally reattach all shingles removed in the process. This great video presentation shows you how to seal a pipe on a flat roof to avoid water ingress and completely waterproof a flat roofing installation. Roofing nails per side photo 2. Slide the new flashing over the vent pipe and under the shingles above the pipe.

Rubber vent flashing automatically adjusts to any pitch lift the vent enough to spread caulk under the sides but not the bottom edge then nail with three 1 1 4 in. 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. Center the pipe in the flashing and push the flexible front corners up or down so that the flashing pipe is parallel to the vent pipe. To make the installation easier you can turn the flashing as you lower it in place.

The flashing should be installed under the top and side shingles but it should be laid above the shingles that are below the vent pipe. Add a large bead of caulk in a half moon shape around the flashing and put the shingles back in place. Install flashing on existing roof to extend the lifespan of your roof.