How To Install Vent Pipe Flashing On Flat Existing Roof

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.

How to install vent pipe flashing on flat existing roof.

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. 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. The neck of the flashing should fit snugly around the pipe. Slide the new flashing over the vent pipe and under the shingles above the pipe.

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. To make the installation easier you can turn the flashing as you lower it in place. See other blogs for a proprietary vent flashing repair kit and a repair using a boot flashing with the roof pan trimmed off.

Install flashing on existing roof to extend the lifespan of your roof. 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. Hammer the nails into the top and sides of the flashing. 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. Put one nail in the bottom edge with a dab of caulk under it to seal the. I ve used this repair on several roofs over the years.