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Tight plumbing

nicoman | Posted in Construction Techniques on March 28, 2007 04:20am

I’m having a bit of difficulties getting a shower drain to fit between joists.

Dilemma: I have to go perpendicular through one 2×8 joist (7″ physical) to get to the waste and that leaves very little space heightwise for a P trap under the shower. Before asking for help I brainstormed the following:

1) Reframe an opening: I have the waste running parallel with the joists in the next bay so that doesn’t seem to be an option (luckily). I can’t displace the trap either, there is no greater depth within reasonable distance.

2) Go down a size to 1 1/2″ and place a 45″ piece against the drain, thereby leaning the whole trap 45″. Still very tight and against code on drain size and possibly also on the trap angle.

3) Some sort of clever trap like the one I enclosed on the picture below. Can’t seem to find something like this in US though. Tend to remember drum traps are against code but not sure if this falls under that.

Any bright ideas?

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Replies

  1. User avater
    JeffBuck | Mar 28, 2007 06:07am | #1

    raise the shower floor.

    Jeff

        Buck Construction

     Artistry In Carpentry

         Pittsburgh Pa

    1. nicoman | Mar 28, 2007 06:27am | #2

      I've actually thought of that but I don't see how it would help. The trap still has to fit below midjoist.

      1. User avater
        JeffBuck | Mar 28, 2007 06:33am | #3

        raising the whole deal up won't help?

         

        I'm picturing this wrong then.

        maybe I have a picture of the shower floor I raised today in my mind!

         

        customer originally asked about "more headroom" ... how about less so we can get it inspected!

         

        Jeff

         

        Jeff    Buck Construction

         Artistry In Carpentry

             Pittsburgh Pa

        1. nicoman | Mar 28, 2007 06:50am | #4

          Well, in this case I guess I would have to lower the ceiling in the room below unless I'm completely misunderstanding you.

          1. nicoman | Mar 29, 2007 02:00am | #5

            I'm bumping this a little. Surely someone hasto have a solution for fitting a shower trap inside 2x8 joists?

          2. nicoman | Mar 30, 2007 01:03am | #6

            I got another idea for a shallow trap. What if I construct my own P out of 2 pieces of 90 degree and one 45 degree, have a look at the attached picture, kind of hard to explain.That would work with 2" but it would obviously be a smaller trap than normal, I drew two red lines on the picture to visualize the levels.The question is, would it be an acceptable height difference for the trap to function properly? And would it be up to code?

          3. junkhound | Mar 30, 2007 01:12am | #7

            Ya mention codes, but dont say if you have to get this inspected or not. 

            Have some good solutions -= that are perfectly safe and non poluting, etc =- if you dont have to do inspection per some arbitrary code.

            One of my kids always worries about re-selling if not per code, most places dont re-inspect.  

          4. nicoman | Mar 30, 2007 04:49pm | #8

            Following code just makes everything less worrysome, no trouble with the law and hopefully it means that everything is done properly.In this case though I'm really more interested in functionality, if this trap is too small to work. It's next to a toilet and I wouldn't want gases to sneak by.I'm amazed no one else has been in the situation, after all many houses have showers on upper floors, and I'm sure many of these houses have 2x8 joists as well.

          5. User avater
            BillHartmann | Mar 30, 2007 06:02pm | #9

            You can get new drum traps.http://plumbing.hardwarestore.com/52-333-pvc-traps/drum-trap-241364.aspxhttp://www.elkhartproducts.com/solder-joint/inventory.cfm?cat=27Two problems. First they are all 1 1/2" and you need 2 for the shower.2nd they need access from the top for the cleanout.If you can move it out into the bathroom and then use a decorative acess plate in the floor..
            .
            A-holes. Hey every group has to have one. And I have been elected to be the one. I should make that my tagline.

          6. DK | Mar 30, 2007 10:12pm | #10

            I have a home built in 1875 and I have the same type of problem but luckily my floor is sagging 1 1/2 " inches down near the shower unit . So building up the floor allowed me to fit a 2" pee trap in between 2X8 joists for the shower drain My only thought would be to build up the floor in that area.. or relief the plywood floor a bit DAN

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