Putting an bathroom on a raised basement floor

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by dwill7000, Sep 11, 2007.

  1. dwill7000

    dwill7000 New Member

    Sep 11, 2007
    I have all the plumbing roughed in for a bathroom but they were put in an awkward location, right in front of a large window. What Id like to do is put a toilet, tub and sink further back in the basement which means putting in all new sewer hookups. But I hate cutting concrete and noise is an issue.

    So I thought Id put the whole bathroom on a raised wooden floor. The main stack from upstairs is only about 5 feet away from where Id locate the toilet.

    1. Can I hook the tub and sink into the toilet drain or does it have to run separately?
    2. Does it all need to be vented or can it do that through the main stack?
    3. How much slope and therefore how high would the floor have to be to make a 5' run?
    4. As long as I build a solid floor (7/8' plywood) and theres no flex, is there any issue with building on a wood floor thats over concrete?

    Thanks. Appreciate any help.
  2. patrick88

    patrick88 Plumber

    Sep 3, 2007
    Webster Ma.
    yes with vents
    vents are needed. if you don't when you flush the toilet upstairs the trap for your fixtures down stairs could empty and cause your basement to smell like sewer:eek: .
    you need a pitch of 1/4" per foot.
    you would be much happier opening the floor. It would be much nicer looking if you just open the floor.
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  4. cwhyu2

    cwhyu2 Consultant

    Aug 11, 2007
    Cincinnati OH
    Iagree with pat to step up to a bathroom is not good.
    Open the floor up and when it is done you will be much happier.
  5. GrumpyPlumber

    GrumpyPlumber Licensed Grump

    Jun 18, 2007
    Plumber, self employed
    Licensed Grump
    Make that three.
  6. acjensen

    acjensen New Member

    Aug 29, 2007
    Chimney Sweep
    St. Cloud, MN
    ditto, that's what i'm doing.
  7. Gary Swart

    Gary Swart In the Trades

    Sep 1, 2004
    Yakima WA
    Raising a tub or even the whole bathroom floor for a drain is a hack job. There are companies that cut concrete and would have this job done in very short order. Besides being fast, they are clean, will remove the concrete they cut out.
  8. geniescience

    geniescience Homeowner

    Nov 27, 2005
    humid summers hot, humid winters cold
    there is never dust; that's how clean they are! They use a wet saw that sprays water on the cut as the blade makes the hole or the straight cut. You won't have that dangerous microscopic dust that concrete makes.

  9. thezster

    thezster New Member

    Jul 18, 2005
    Retired young... day trade stocks - and to keep bu
    Fort Collins, Colorado
    I hope their equipment is more modern than what I rented yesterday. I rented a walkbehind concrete saw, with water sprays, diamond blade, etc., etc....... Yet the basement I was cutting still filled with both concrete dust and engine exhaust to the point that we could barely see through to the opposite wall......

    On the other hand, cutting the floor was easy as slicing bread - taking little over an hour to make a 15' X 1' rectangle.......
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