Hi, I am trying to replace a cracked section of stacked cast iron soil
pipe with new pvc. So far I have bought a riser clamp to support the
upper sections of pipe while I cut and replace the piece. I have also
located a rental place that has a cast iron cutter. My problem is that
since I can't support the pipe from the floor above without tearing up
a floor or wall, I may need to build some kind of scaffold for the
riser clamp to sit on. Is it sufficient to rest the riser clamp on
2x4s that are attached to wall studs? There is approximately 10 feet
of pipe above the damaged part. Thats got to be alot of weight.

I am usually a pretty fearless DIYer, but this thing makes me a
nervous. Am I in over my head???

thanks,
Aron