Roof Vent Stack Boot Question

[n1st]

My vent stack boots are in very bad shape and the rain must have been combing into the attic. The pipe was 3", so I bought a 3" to 4" rubber adaptor from Lowes and put it down, I think it should work. Anybody else try this? The alternative is to remove the boot (and plate) from shingles and replace.

I have a 2" vent stack also. This one doesn't look to be leaking yet. I don't think there is a 2" to 3" adaptor readily available, so I'm looking for ideas.

 

[wahoowad]

I don't know the various sizes available. Just adding my 2 cents that mine leaked (they dry rotted and leaked when it rained) and I bought a replacement boot, slid it down over the existing one, cemented it in place. Was an easy fix. I used a lot of tar (from a caulk gun type of tube). You are on the right track.

 

[steam man]

I was just researching products for roof project and came across a pipe collar at: www.wilmarproducts.com. It just sides down. I am not sure if will fit over a no-caulk Oatey type flashing. It seems like it is just a flared adapter as opposed to the DWV reducer (which should work anyway).

 

[n1st]

Yes, mine dry rotted. A replacement boot would be just the thing. Where did you find it?

 

[n1st]

Steam man, thanks for the link, but it doesn't look like it'd fit.

 

[wahoowad]

Mine came from Lowes

 

[Hogwildz]

That will work. Personally, I'd take the old one off and install a new one. The pipe collars come in a few sizes.
Rule of thumb, one covers several sizes. Use the one that rated for that size or smaller. Never use one that made for a larger size than the pipe your flashing.
Muck works, but does crack over time, makes a mess, and if you need to take it off, good luck. Its a PITA.
Top 1/2 of collar at very least should be under the shingles. the bottom 1/2 or few inches on top of shingles. Exactly where depends on where the shingle courses are.