This particular pipe use is Sanitary, but for underground pipe I believe it
would also apply to storm water drainage, and any other gravity drained
systems. As for the "International Code", that is a published set of codes.
The IBC (International Building Code) has pretty much taken the place of
BOCA and includes the International Plumbing Code, International Mechanical
Code, etc. etc.
As far as I can tell, the codes have a minimum 2" pipe size for underground
pipe, and a minimum of 3" if a water closet (toilet) is hooked up to it, and
up form there depending on the load. Unfortunately I cannot find anyplace
in the codes (except for Florida's code) where it specifies this. I'm
trying to find specifics if anyone can educate me.
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