Use the knife blade to scrape the pipe clean and smooth.
How to seal furnace vent to steel roof.
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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Use the tar brush to apply a thin layer of tar to the edges of the hole.
Other causes of leaking roof vent are including broken seams on the metal base loosen nails and rusty metal collars around the vent pipe.
Trim the flashing in the center of the rubber boot with a roofing knife so it fits snugly around the pipe.
Some caulk guns have built in tube cutters that work.
2 cut the tip of a caulk tube with a utility knife.
This will help to create the initial seal between the metal roof and the vent mechanism.
Step 7 place the vent into position.
Trace the outline of the base of the rubber boot onto the metal roof with a pencil.
Slide the rubber boot over the pipe to check the fit.
Then run a second bead of caulk just below the first bead.
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Remove the rubber boot.