Remove the plastic backing from the roofing membrane and slide it over the vent pipe and down onto the roof.
How to seal reseal pipe boot on roof.
Run a bead of silicone caulk around the vent pipe opening in the roof.
The slide the boot down the pipe and leave it about 3 above the roof.
Apply silicone caulking around the area where the vent pipe penetrates the roof.
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Use the knife blade to scrape the pipe clean and smooth.
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Then run a second bead of caulk just below the first bead.
Cut away the old caulk from around the vent pipe.
Make sure you need a new boot may just need a bit of bitumastic caulk if it is leaking a bit at the duct contact as they commonly do as the rubber gets older.
Then run a second bead of caulk just below the first bead.
Apply a thick bead of lap seal caulk around the seam between the vent pipe and old rubber gasket.
Apply a thick bead of lap seal caulk around the seam between the vent pipe and old rubber gasket.
And begging to caulk around where the boot will go on the roof.
Seal the roofing membrane by applying silicone caulking in the area where the roofing membrane comes in contact with the pipe.
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Insert the roofing membrane with the backing removed through the pipe.
If split then yes it needs replacing though a good wrap with waterproof duct tape or bitumastic caulk will keep it intact and dry until a roofer can fix it.
Now slide the boot down and make sure there is enough caulk to have a seamless circle all the way around.
Use the knife blade to scrape the pipe clean and smooth.
Place the new boot in the hole of the pipe and cut the boot on the line that touches the rim.
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