Replace Roof Vent Pipe Seal

Apply a thick bead of lap seal caulk around the seam between the vent pipe and old rubber gasket.

Replace roof vent pipe seal.

Use your cutters to trim the seal until it fits neatly over the old seal. Use the knife blade to scrape the pipe clean and smooth. Remove the plastic backing from the roofing membrane and slide it over the vent pipe and down onto the roof. Cut away the old caulk from around the vent pipe.

Then run a second bead of caulk just below the first bead. Steps to replacing a roof vent jack. Works for any size pipe. Roof jacks fit over plumbing vent pipes that protrude through the roof to keep them from leaking.

Use a pocketknife to scrape rough edges and sharp points from upper end of plastic vent pipe. To replace a damaged roof vent jack on your home. Dry fit it in place and make sure everything lines up and looks good add tip ask question comment download. Run a bead of silicone caulk around the vent pipe opening in the roof.

Slide the replacement rubber gasket over the pipe and press it down tight to the flange.