You can only insure a tight seal if you remove the old material.
How to replace a roof vent pipe boot.
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The metal i m using is called crinkle black i purchased all my materials at h.
Works for any size pipe.
Take the extra time to clean the pipe and boot well.
Heavy scissors or metal shears.
Obtain another rubber seal.
I purchased a plastic.
Video turorial on how to change out a plumbing vent boot.
To replace a pipe vent boot completely requires that a few shingles be removed on the upper side of the boot so that the old nailing flange of the vent boot can be removed and replaced with a new.
In this video i cover installing a roof boot for a vent pipe in a metal roof.
Finish and clean up.
The old caulk will be prone to cracking and you want to make sure that the new seal is tight.