Can you reuse a roof vent boot?

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Md9918

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Doing a bathroom remodel and ripped out the 3" cast iron vent stack. I left about a 24" stub of cast iron in the boot. I tugged on it a bit and it doesn't seem like it's going anywhere.

My question is: can I just push the cast iron out and push some new PVC through? Or should I just leave it the way it is, and connect the PVC to the cast iron stub with a coupling and deal with it whenever I replace the roof?

My concern is that the boot is stretched out and no longer elastic (I would guess it's 10-20 years old) and won't make a good seal against the PVC.
 

breplum

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The old roof jack rubber is probably shot. There are 'vent shield' 'vent flashing' products that slip over the new pipe to provide protection that may work. LSP makes one, Oatey also.
Coupled with a first pass of compatible elastomeric sealant on the old rubber, then also seal the top edge of the shield, you should be fine.

We use special shingle tool to remove old roof jack.
1643738963166.png
 

Md9918

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The old roof jack rubber is probably shot. There are 'vent shield' 'vent flashing' products that slip over the new pipe to provide protection that may work. LSP makes one, Oatey also.
Coupled with a first pass of compatible elastomeric sealant on the old rubber, then also seal the top edge of the shield, you should be fine.

We use special shingle tool to remove old roof jack.
View attachment 80618

Thanks-- this is exactly the route I went. Oatey calls them a "rain collar," and they're around $5. Basically, a boot for your boot. A really great, simple solution.
 
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