Re: depth under slab
Posted by ED on March 15, 2004 at 18:41:08:
In response to Re: depth under slab
Conventional wisdom dictates a slope of 1/4" per foot. So among the factors is the length of the run. Often, you'll find the DWV about 12 inches below the surface of the slab. Sometimes more, othertimes, less.

You will need to support the (sloping) pipes through stakes, gravel, etc. You then pour the concrete over the gravel bed that typically covers the DWV pipes.

Typical is 4 inches of gravel followed by 4 inches
of concrete.

: You cannot put it in the concrete, but anywhere else is okay.

: : How deep below the slab must I run the DWV piping? I'd like to cut it as close as practicable so I can get the extra headroom we need in the basement.

: : Thanks, Matt

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