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    cdefraia's Avatar
    cdefraia Posts: 14, Reputation: 1
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    #1

    May 16, 2008, 08:36 AM
    Drain pipes for under slab foundation
    I know this question was partially answered already,but I would like to ask again as this will be new construction.As I plan my main drain under slab at 1/4" per foot is only one vent stack allowed coming off the drain or could there be another?Also I would like to know if pvc 40 and pex tubing is acceptable covered with gravel and then cement.Is the vent stack allowed to go out a gable wall and not through the roof?
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
    		  
    #2

    May 16, 2008, 08:41 AM
    No on the gable and yes you can have more than one vent if needed. Why are you needing to put PEX under the floor?
    cdefraia's Avatar
    cdefraia Posts: 14, Reputation: 1
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    #3

    May 16, 2008, 08:51 AM
    It's a panelized house with all exposed beams and we are trying to eliminate as many box ins as possible for the plumbing.
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
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    #4

    May 16, 2008, 08:53 AM
    Yes with burying both the sch 40 and PEX after covering with gravel.
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