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Sealing area around pipe

Discussion in 'Plumbing and Central Heating' started by joec_85, 19 Feb 2021.

  1. joec_85

    joec_85

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    We have a lean-to which contains a bathroom (I think it was previously an external bathroom but that the lean-to was built around it). We also keep our washing machine in there.

    I was installing a new washing machine drain when I noticed that the waste pipe drops drops down to the drain under the lean-to via a rather large hole in the floor, which I imagine is letting fumes back up (and making my lovely new P trap quite pointless).

    [​IMG]

    [​IMG]

    The gap is about 1-2cm wide, all the way around the pipe and I can see the drain beneath.

    I was just wondering what the best way to fill this might be? I had considered expanding foam but wasn't sure whether it would just fall down into the drain underneath without some kind of support. Will just spraying the areas that I want it to stick to with water be enough?
     
    Last edited: 19 Feb 2021
  2. HERTS P&D

    HERTS P&D

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    Foam filler.

    Andy
     
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  4. joec_85

    joec_85

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    Cheers Andy, do I need to back it with anything first or just spray the pipe with water so that it sticks?
     
  5. HERTS P&D

    HERTS P&D

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    Just foam it up, then cut it flush after 24hrs. (don't use too much, it does grow)

    Andy
     
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