Trim the flashing in the center of the rubber boot with a roofing knife so it fits snugly around the pipe.
How to seal furnace vent to steel roof.
Trace the outline of the base of the rubber boot onto the metal roof with a pencil.
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Use the tar brush to apply a thin layer of tar to the edges of the hole.
2 cut the tip of a caulk tube with a utility knife.
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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.
Step 7 place the vent into position.
Remove the rubber boot.
Apply a thick bead of lap seal caulk around the seam between the vent pipe and old rubber gasket.
This will help to create the initial seal between the metal roof and the vent mechanism.
Brush away any dirt or dust from the area around the furnace vent that you will be sealing.
Then run a second bead of caulk just below the first bead.
Slide the rubber boot over the pipe to check the fit.