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Floor levelling compound

  • 10-04-2014 11:13am
    #1
    dave45dave
    Registered Users, Registered Users 2 Posts: 280 ✭✭


    Hi , just wondering can floor levelling compound be used on 8x4 sheets of plywood. Have a belly in the centre of both bedrooms and dont want to lift them and use packers. Rooms are covered in carpet.
    Thanks in advance


Comments

  • #2
    wait4me
    Registered Users, Registered Users 2 Posts: 2,056 ✭✭✭wait4me


    I doubt it but maybe someone else will confirm. I think that the self levelling compound needs to bond to something solid like concrete and find a natural level. Think about it: there would be too much play on the plywood and the the 'thinish' covering of compound would most definitely crack.


  • #3
    dave45dave
    Registered Users, Registered Users 2 Posts: 280 ✭✭dave45dave


    wait4me wrote: »

    Thanks , kind of thought that myself about bonding but forgot about movement


  • #4
    slimjimmc
    Registered Users, Registered Users 2 Posts: 7,786 ✭✭✭slimjimmc


    There are flexible levellers that can be used on wooden substrates http://www.laydex.ie/building-products-materials/levelling-compounds.html *

    However I'd worry as to why the 'belly' formed in the first place and is it likely to get worse. The leveller is probably designed to cope with expansion and a certain amount of natural bounce in a wooden base but I don't know if it would cope with a base that's sagging or a buckling excessively.



    * it's just the first thing I found on Google, not a product recommendation.


  • #5
    dave45dave
    Registered Users, Registered Users 2 Posts: 280 ✭✭dave45dave


    slimjimmc wrote: »

    Its there years and hasnt gotten any worse. As far as i know the joists are at their max span


  • #6
    DenisCork
    Registered Users, Registered Users 2 Posts: 74 ✭✭DenisCork


    Bal fibrebase, can be used on ply and t & g. Brill stuff, I've used it to its limits and never had a call back.
    As said above if there's too much bounce in the floor it could crack.


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  • #7
    dave45dave
    Registered Users, Registered Users 2 Posts: 280 ✭✭dave45dave


    DenisCork wrote: »
    Bal fibrebase, can be used on ply and t & g. Brill stuff, I've used it to its limits and never had a call back.

    Thats great thanks , do most providers sell it or do i have to go to a certain place


  • #8
    DenisCork
    Registered Users, Registered Users 2 Posts: 74 ✭✭DenisCork


    Tubs and tiles sell it. Ring ahead though they'll have to order in in.


  • #9
    c0rk3r
    Registered Users, Registered Users 2 Posts: 1,256 ✭✭✭c0rk3r


    There's an assortment of problems associated with levelling over plywood. In Germany and i think Australia its against building regulations. Here though, your good to go. Just ensure that the plywood is 18mm thick and you screw it down at the recommended centers (avoid nailing it). Also you need a specific kind of leveller too. Latex with fibres in it is probably the best. Also the thickness of the leveller needs to be above 6mm ( Thats from memory but it has to be above 3mm for sure )


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