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.

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. 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. See other blogs for a proprietary vent flashing repair kit and a repair using a boot flashing with the roof pan trimmed off. Slide the new flashing over the vent pipe and under the shingles above the pipe.

Finally reattach all shingles removed in the process. 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. Roofing nails per side photo 2. Hammer the nails into the top and sides of the flashing.

To make the installation easier you can turn the flashing as you lower it in place. 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. Add a large bead of caulk in a half moon shape around the flashing and put the shingles back in place. 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.

The neck of the flashing should fit snugly around the pipe. Install flashing on existing roof to extend the lifespan of your roof. I ve used this repair on several roofs over the years.