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Is Cast DWV Required in Type I & II Construction?

Beniah Naylor said:

2021 IBC - 603.1.2​

The use of combustible piping materials shall be permitted where installed in accordance with the limitations of the International Mechanical Code and the International Plumbing Code.
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Yes, but other than the IMC for a plenum space or a penetration through a fire rated assembly, I don't see where you can't replace cast with pvc such as replacing a 6' cracked section of cast with PVC. The IMC is helpful but not the IPC.
 
jar546 said:
Yes, but other than the IMC for a plenum space or a penetration through a fire rated assembly, I don't see where you can't replace cast with pvc such as replacing a 6' cracked section of cast with PVC. The IMC is helpful but not the IPC.
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Correct....603.1.2 allows it.....Massachusetts still has like a 3 story limit on plastic piping....
 
jar546 said:
Yes, but other than the IMC for a plenum space or a penetration through a fire rated assembly, I don't see where you can't replace cast with pvc such as replacing a 6' cracked section of cast with PVC.
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Yep, replace away.
 
I guess that cast iron (usually no-hub) is usually used in types I & II because it's considered as more rugged and that's the way it has always been done. It is less noisy than PVC when somebody flushes a toilet upstairs, or storm drainage piping during a downpour. Penetrations of rated construction might be simpler since you just need to fill the annular space with a non-combustible material.

I've seen polypropylene piping used as acid waste piping in a 4 story II-A college science building.
 
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