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Waterproof Concrete.

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  • 12-12-2019 1:32pm
    #1
    Meningate
    Registered Users Posts: 41 ✭


    Hi, I'm planning on building a water feature in the garden which will require a water storage sump of around 2000 litres. Plastic tanks of suitable size run into thousands so I'd like to cast a re enforced Concrete tank just below ground. It would be great to mix something with the Concrete so that the finished tank would be watertight, but I'm equally happy to do a normal mix casting and then render it internally with two coats of waterproof rendering. The question is, what waterproofing method to use and where can I get it? Advice appreciated.


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    #2
    Calahonda52
    Registered Users Posts: 12,230 ✭✭✭✭Calahonda52


    My concern would be poor compaction and cracking, not to mind the work :)
    2m by 1m by 1m internal :)
    How will you cover it to make it safe?
    Best think of tanking it

    “I can’t pay my staff or mortgage with instagram likes”.



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    #3
    Meningate
    Registered Users Posts: 41 ✭Meningate


    Thanks Calahonda52. I plan to hire a vibrating Concrete compactor during construction and it will be re enforced with 6mm re bar mesh, as will the Concrete lid. Happy to tank it, but what with ?


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    #4
    tabby aspreme
    Registered Users Posts: 3,856 ✭✭✭tabby aspreme


    Could you tank it with a pond liner, or if you have access for a truck or digger put in a concrete base, and put a large concrete pipe on it.


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    #5
    bunderoon
    Registered Users Posts: 665 ✭✭✭bunderoon


    https://www.paintingaluminium.com.au/aluminium-painting/what-is-2-pack-paint/


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    #6
    Atlantic Dawn
    Registered Users Posts: 81,407 ✭✭✭✭Atlantic Dawn
    M


    Put a couple of layers of fibreglass directly on to the concrete.


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    #7
    Alucan
    Registered Users Posts: 105 ✭✭Alucan


    Casting a concrete tank would be the most expensive option by far and very labour intensive. Also safety becomes a concern as the hole needs to be much bigger and the sides sloping back to avoid the danger of it collapsing when you are in the hole putting together the form work. A plastic tank suitable for under ground use should be available for around € 1400 delivered to your site the benefit of plastic would be that it is light to lift into the hole.
    The next option would be precast concrete delivered to site with a crane truck and lifted into the hole should be doable for around €1600.


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    #8
    Still waters
    Registered Users Posts: 1,166 ✭✭✭Still waters


    Could you build a block on flat enclosure and drop 2 1000 liter ibc tanks into it, they're on done deal for 70 or 80 euros


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    #9
    KK4SAM
    Registered Users Posts: 735 ✭✭✭KK4SAM


    Why not couple two IBC's together and fill around them with lean mix ? water proof for life.


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    #10
    Car99
    Registered Users Posts: 2,530 ✭✭✭Car99


    You can buy a 4000L precast septic tank for €800 why bother building it yourself.


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    #11
    BryanF
    Moderators, Home & Garden Moderators Posts: 10,140 Mod ✭✭✭✭BryanF


    KK4SAM wrote: »
    Why not couple two IBC's together and fill around them with lean mix ? water proof for life.

    Wouldnt even need to encase. Just keep them out of the light..


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    #12
    listermint
    Registered Users Posts: 33,714 ✭✭✭✭listermint


    Pond liner pond liner pond liner


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    #13
    dathi
    Registered Users Posts: 1,386 ✭✭✭dathi


    if you google "concrete koi pond sealer" you will get names of sealers for concrete ponds i have used a ibc container underground to collect rain water , sat it on concrete base and used a week mix of concrete between it and clay walls and topped it off with some concrete lintels if you are doing it this way make sure you fill the ibc with water before you pour the concrete walls to stop the ibc from distorting inwards .if you need to connect the two ibc together you will find lots of fittings on line catering to the koi pond community


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    #14
    Meningate
    Registered Users Posts: 41 ✭Meningate


    Thanks you everyone, a very wide range of ideas there to look into, many of them new ones to me. I'm sure my problem will soon be solved !


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    #15
    KK4SAM
    Registered Users Posts: 735 ✭✭✭KK4SAM


    BryanF wrote: »
    Wouldnt even need to encase. Just keep them out of the light..

    He wants it below ground,depend on what vehicular traffic is in the vicinity.


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