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Thread: Expanding foam.

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    Senior Member Rank = Rokusai Steve's koi's Avatar
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    Expanding foam.

    Hi Koi lovers. A quick question I would like answered asap please as I'm working on my pond build. Can I use expanding foam to fill a large hole (2ft L x 1ft H x 6" deep) in my bug out pond before I fit the underlay and liner. I'm worried the foam may collapse through pressure after I fill the pond.
    Thanks in advance.
    Atb, Steve.



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    Senior Member Rank = Jussai Djstiles999's Avatar
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    Not sure I’d want to try and fill a hole that size in the bottom of the pond myself, think it’s ok for small ones but that’s concrete territory for me I think, just a guess as I don’t know but if it was me I wouldn’t

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    Extreme Koi Member Rank = Sansai perks842's Avatar
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    Any picture please?

    Sounds like a cement/concrete jobby as said above.

    Sent from my ONEPLUS A6013 using Tapatalk

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    Moderator Rank = Supreme Champion Feline's Avatar
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    What construction method are you using for the pond base?
    Why not just fill the hole with soil / rubble etc. ?

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    Quote Originally Posted by Djstiles999 View Post
    Not sure I’d want to try and fill a hole that size in the bottom of the pond myself, think it’s ok for small ones but that’s concrete territory for me I think, just a guess as I don’t know but if it was me I wouldn’t
    Thanks DJ, The hole is at the bottom of the concrete collar, not the bottom. The earth fell away while it was being dug as the ground is so dry. I've just had a proper measure up and the hole is about 2ft long x 6" H and about 4" deep.

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    Senior Member Rank = Rokusai Steve's koi's Avatar
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    [QUOTE=perks842;352223]Any picture please?

    Sounds like a cement/concrete jobby as said above.

    Pics on there way.

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    Quote Originally Posted by Steve's koi View Post
    Thanks DJ, The hole is at the bottom of the concrete collar, not the bottom. The earth fell away while it was being dug as the ground is so dry. I've just had a proper measure up and the hole is about 2ft long x 6" H and about 4" deep.
    If that’s where it is then so long as you fill it with something that won’t compress or biodegrade, and will stay put until the water pressure is there to hold it in place, it doesn’t matter what.

    Expanding foam can soak up water so I’m not sure it’s necessarily the best thing to use in an outdoor wet location like that?
    Personally I would just fill it up with some stiff mortar mix.

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    Senior Member Rank = Rokusai Steve's koi's Avatar
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    Quote Originally Posted by Feline View Post
    What construction method are you using for the pond base?
    Why not just fill the hole with soil / rubble etc. ?
    It's not the bottom of the pond Feline, It's just under the concrete collar

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    Ah yeah, I would just wang some mortar mix in there.

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    Extreme Koi Member Rank = Sansai perks842's Avatar
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    Have you got any rebar or mesh around? Ideally attach that into the bottom of your little cave, give the mortar something to stick too. And just fill her up, throw some clean rocks in with the mix as you press it in, save you having to makes loads of mix. Plus hold it together.

    If it doesn't hold its shape then just do half in morning then the other half in the evening. Or overnight etc, to give the first level a chance to set.

    Sent from my ONEPLUS A6013 using Tapatalk

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    Senior Member Rank = Rokusai Steve's koi's Avatar
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    Thanks everyone. I've got some postcrete spare so I'll use that.

    Atb, Steve.

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    Senior Member Rank = Jussai Djstiles999's Avatar
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    Quote Originally Posted by Feline View Post
    Ah yeah, I would just wang some mortar mix in there.
    Wanging?

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    Quote Originally Posted by Djstiles999 View Post
    Wanging?
    Have you never taken part in a welly wanging competition?
    Maybe it’s just a Somerset thing

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    Senior Member Rank = Adult Champion Mikeh83's Avatar
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    Quote Originally Posted by Feline View Post
    Have you never taken part in a welly wanging competition?
    Maybe it’s just a Somerset thing
    I know welly wanging, and that’s not a euphemism Expanding foam.


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    Senior Member Rank = Rokusai Steve's koi's Avatar
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    I'm glad you said wanging

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