The bell shaped base encloses around the dome of the original boot flashing and sheds water around it.
Replacing roof pipes collars.
Figuring that the rubber collar on the new flashing may split before it s time to strip and replace the roof shingles another 20 years hopefully i first seal the vent pipe to the metal of existing flashing with protectowrap s form flash 2 flashing tape.
You can also replace the entire flashing around the pipe.
However replacing the entire flashing can be quite involved and may require the application of new shingles.
A cap collar slides over the base assembly to completely enclose the vent pipe.
Vent pipe collar skirt for vent pipe care and maintenance.
This old house general contractor tom silva shows how to create a watertight seal around a vent pipe.
The abs vent pipe allows a simple solution to leaks associated with vent pipes that can slowly or quickly degrade the condition of your ceiling.
They also make a boot flashing repair version.
See below for a shopping list and tools subscribe to.
The best way for a do it yourselfer to repair a roof boot is to seal the existing boot and apply a new rain and repair pipe collar.