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    Gavin1223's Avatar
    Gavin1223 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Mar 9, 2010, 12:49 PM
    Should a shower be vented before or after the P trap?
    The shower is in my basement & The drain goes to a tank in the slab for up-flush..
    Milo Dolezal's Avatar
    Milo Dolezal Posts: 7,192, Reputation: 523
    Plumbing Expert
    		  
    #2

    Mar 9, 2010, 03:36 PM

    Shower should be vented after P-Trap. In other words, water enters P-Trap first then flows pass the vent.
    afaroo's Avatar
    afaroo Posts: 4,006, Reputation: 251
    Ultra Member
    		  
    #3

    Mar 9, 2010, 05:17 PM

    Yes Milo is correct vent is after the P-Trap see the attachment for vent lay out, Thanks.

    John
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    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #4

    Mar 10, 2010, 06:42 AM
    Both experts are correct. The vent runs after the trap. However, there.s another way that doesn't involve running a vent off the shower as depicted in the image john put up. We wet vent , (see image ) our showers in my area. This reduces the number of bathroom roof vents from three to one. Your choice. Tom
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