how do i replace a cast iron soil stack with a plastic one.?

Answer 1

You'll be cutting all day with a sawzall unless you have a diamond blade from Lennox, which is a fairly new blade they come out with so may be hard to find. I always cut cast iron with a grinder and a diamond cut wheel. You can rent a snap cutter or chain cutter from Home Depot or a rental store. The snap cutter is quicker but if you dont know what youre doing then you may have a problem. Once you cut a section of the pipe out then measure your PVC pipe to fit in the open space that you just cut. Slide a no hub coupling, mission band, or CT adaptor over the PVC pipe on both ends. Place the pipe in the open space and then slide which ever adaptor you used (no hub, mission, or CT) over the cast iron to where the band covers half the PVC and half the cast iron. Tighten the hose clamps on the band with a 5/16 nut driver and there ya go!

Answer 2

Talk about dirty jobs ...

What you do is cut the iron pipe with a "sawz-all" then attach a rubber collar to it (made for this application) secured OVER the iron with a big pipe clamp (I'm referring to the circular metal band with slots in it and a screw mechanism on one end). The schedule-40 stack goes in the other end, which is tapered to receive the thinner material. Another metal band goes there. That's all.

Answer 3

You can purchase No-hub (brand name) or Fernco couplings that adapt from cast iron to PVC. You can cut the cast with a Saw-zall or rent a cast iron snapper at local rental stores.