Hi all! I found myself here by way of the John Bridge tile forum. I'm doing a bathroom renovation on a 1950's slab foundation in North Texas. I'm wanting to go back in with a Kerdi drain and waterproofing membrane. In preparation for it, I'm wanting to replace the existing trap with PVC. In the attached pics you can see what I have. I'm basically wanting to cut it right behind the bell with a carbide tip blade in my sawzall and transition with a Fernco connector into the PVC trap.
So, as my question says, is methane a danger when cutting cast iron? I really don't want my first big plumbing project to end in disaster. Any other comments or suggestions are more than welcome.