Washing machine waste

Discussion in 'Misc DIY' started by Adrian Godwin, Feb 12, 2007.

  1. I'm thinking of moving a washing machine from its position against an
    outside wall to a brick-built cupboard. This involves replumbing it,
    which I hope is fairly straightforward as the cupboard contains
    boxed-in pipes for the bathroom.

    However, I'm not sure about the waste outlet : currently it goes
    through the wall and into an outside drain along with the sink waste.

    In the new location, it needs to be combined with the bathroom
    waste. I presume that this is the sewer downpipe but it's possible
    that the sink/bath waste are separate (I haven't unboxed the pipes

    Is it OK to put washing machine waste into such a downpipe (via a
    suitable trap) or does it need the open outfall that it's currently
    got ? I can imagine I might get too slow a flow into the bath waste
    for a washing machine, resulting in flooding. And I'm not sure if
    soapy waste is put in with the foul water or handled separately.

    I shall probably get a plumber to actually do this part of the work
    but would like to know whether it's an OK thing to do.

    Adrian Godwin, Feb 12, 2007
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  2. Two storey house, cupboard on ground floor off kitchen, bathroom above.
    There's a boiler in there right now but I'm intending to replace it
    with a modern wall-mounted one, perhaps elsewhere. I hope that will
    make room for the washing machine, if the plumbing's practicable..
    There's also an air inlet in the floor fed from an airbrick which
    is presumably to help the boiler breathe, though it later had a
    louvred door fitted as well.
    I know there's a ~6-inch sewage pipe in there. Without tearing it
    open, I'm not sure whether there's a smaller bath/basin waste as
    well. It seems possible that the bath waste just empties into the
    sewage, but I've only ever looked at externally-plumbed drains
    with independent piping before. I vaguely recall that rainwater
    goes into a groundwater drain rather than sewage but unsure where
    grey water goes.

    OK, good. Just trying to make sure I'm not asking the impossible.

    Adrian Godwin, Feb 12, 2007
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  3. Adrian Godwin

    robgraham Guest

    One thing to think about is the floor surface that the current w/m is
    on, versus where you are going to move it to. What I'm getting at is
    that it is possibly on a concrete floor currently such that any
    vibrations are not transmitted anywhere. Is this true also of the
    floor of the cupboard ?

    The other thing is to make sure that the drain further up the stack is
    adequately ventilated such that the w/m does not suck out any traps.

    robgraham, Feb 12, 2007
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