Use the knife blade to scrape the pipe clean and smooth.
How to seal furnace vent to steel roof.
This will help to create the initial seal between the metal roof and the vent mechanism.
Trim the flashing in the center of the rubber boot with a roofing knife so it fits snugly around the pipe.
Slide the rubber boot over the pipe to check the fit.
Step 7 place the vent into position.
Brush away any dirt or dust from the area around the furnace vent that you will be sealing.
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When the roof vent is leaking the actual cause must be identified first.
Other causes of leaking roof vent are including broken seams on the metal base loosen nails and rusty metal collars around the vent pipe.
Given the most common causes is cracked or damaged rubber boot the most ideal solution is to remove it and replaced it with a new.
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Some caulk guns have built in tube cutters that work.
Apply a thick bead of lap seal caulk around the seam between the vent pipe and old rubber gasket.
2 cut the tip of a caulk tube with a utility knife.
Then run a second bead of caulk just below the first bead.