Use the knife blade to scrape the pipe clean and smooth.
How to seal roof pipe.
Cut the pvc pipe just below the elbow.
Pry the nails that are holding the flashing.
Step 3 slide the rubber boot over the pipe.
Here s how to seal around a vent pipe by replacing them.
There may be nails positioned underneath the shingles across the top row.
You can do this by running a putty knife across 10 inches of the top row.
Insert the putty knife under the corner of the flashing where it is nailed to the roof to protect the shingles.
Apply a thick bead of lap seal caulk around the seam.
Remove the nails that hold the vent pipe flashing to the roof.
Apply a thick bead of lap seal caulk around the seam between the vent pipe and old rubber gasket.
You need to do this in.
Slip a proper sized flashing on.
How to seal a plumbing vent pipe on the roof 1.
Steps for fixing a leaking rooftop vent pipe.
Use a pocketknife to scrape rough edges and sharp points from upper end of plastic vent pipe.
Then run a second bead of caulk just below the first bead.
Cut away the old caulk from around the vent pipe.
Apply a generous bead of roofing sealant around the base of the pipe with the caulking gun.
Add a bead of sealant on the traced line on the roof.
Some nails will be near the bottom of the pipe others.