Is 1 1/2" Drain Pipe under Concrete Adequate for Sink, Disposal, and Diswasher
Posted by LW on January 01, 2002 at 16:23:53:
I recently had a plumber cut the concrete in the basement to install a sink, disposal, and dish washer drain to connect to a sewage pit with an ejector pump.

After the pipe was installed, I noticed that he had put in 1 1/2 pipe rather than 2 inch. He told me that the 1 1/2 was adequate for the 8 foot drain length.

My understanding is that 2 inch is required under concrete by code.

My real concern is if 1 1/2 inch will handle the load.

Any advice?


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