Originally Posted by johnny331
What about diameter? I was going to use 3" (3.5" OD) schedule 40, I measured the cast iron and that's about the same OD, who knows how thick it is... or is there a special pipe I should use?
I plan to cut the pipe off above the slab, and use a rubber boot to convert to pvc. it's a one level ranch, one bathroom right now.
The cast iron and the sch 40 dwv pipe are close in outside diameter. Close enough that the fernco coupling you want to use will say plastic/ci x plastic /ci or something similar. You can use it for both types of pipe.
The cast iron is not very thick just hard. As far as blades go the carbide grit blades do take some time to cut. There are some newer diamond blades from lenox for cast iron pipe that are supposed to cut 3x faster and last 3x longer. They are spendy for 1 blade but they seem to be ok.
I have only used mine once during a recent job in a restaurant on some 2" ci It cut pretty good.