Any opinions on a Fernco saddle wye for tying PVCinto cast iron vent?

[157]

I’m running a new vent out of a second-floor bathroom remodel and just did some exploratory destruction in a finished attic.

The original plan was to punch a new hole through the roof for the new PVC venting, but I found that the main cast iron vent stack goes through the roof directly over the bathroom. I’m now wondering if I could just tie into the cast iron with a Fernco saddle?

The other option, of course is to cut the cast iron out at the attic level and run all new PVC up and out, but that sounds like more work than necessary?

 

[wwhitney]

Fernco says their saddle tees and wyes are for installation on 6" pipes and larger, so I don't think it's suitable for a 4" vent.

https://www.fernco.com/plumbing/flexible-couplings/flexible-tap-saddles

Cheers, Wayne

 

[Sponsor]

 

[157]

Fernco says their saddle tees and wyes are for installation on 6" pipes and larger, so I don't think it's suitable for a 4" vent.

https://www.fernco.com/plumbing/flexible-couplings/flexible-tap-saddles

Cheers, Wayne

Argh. Good catch. Not sure how I missed that. Looks like I’m cutting some cast iron.

 

[wwhitney]

Something like this might work, I haven't researched it:

https://www.plumbingsupplynow.com/4-x-3-saddle-tee-conversion-kit-with-gasket

How do you drill the hole in the cast iron?

Cheers, Wayne