Originally Posted by
Jerry Peck
Which all leads to another problem with using those rubber flashings instead of the lead flashings when plumbing vents terminate through roofs: The rubber flashings expose *a lot* (comparatively speaking) of PVC to sunlight while the lead flashings expose *very little* PVC to sunlight.
It's true that the rubber flashings expose a lot of PVC to sunlight, but I've never seen a squirrel eat a rubber flashing. I've seen 'em eat lead right down to the shingles. The rubber flashings do degrade after 7-10 years in our climate, although I've never seen PVC vents degrade above a roof.
Ya pay your money and ya take your chances.
