Re: pvc connection to cast iron waste pipe
Posted by e-plumber on December 17, 2003 at 17:28:00:
In response to Re: pvc connection to cast iron waste pipe
: I'm excavating my basement in order to finish it with sufficient head space and I like to reroute and replace my 4' cast iron waste line with pvc. I intend to cut the straight run of the vertical section of the cast iron pipe coming down from the house and tie it into pvc pipe using 4' heavy rubber gasket. Then I plan to tie the pvc back into a horizontal run of the cast iron pipe, again using the rubber gasket. Do you see any problems and should I support the cast iron pipe from above with additional pipe hanger or chain (there is a 45 degree bend at the joist area)? Also, can I encase the new 4" PVC pipe under concrete? And lastly, is it OK to pitch the horizontal section of the new pvc pipe at 1/8" vertical drop per 1' horizontal or less? Thanks for any advice!

- No hub (banded) couplings should be used, not regular rubber couplings with two hose clamps.
- The existing C.I. definetely needs to be supported well before cutting it.
- Some codes do not allow PVC to be buried, check yours.
- 1/4" per foot is always best but some codes allow 1/8" per foot on 4" or larger piping, check your code.
Good Luck. e-plumber

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