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Tiling on OSB

  • 19-01-2024 9:32pm
    #1
    JonathanAl
    Registered Users Posts: 27 ✭


    hello Folks,


    its a tiny area. 1.8 m2. Joists are solid 3 inch wide. Area is upstairs close to joists end. Have screwed the osb every 300mm. 18 mm osb. Thinking of putting on a few coats of sbr. Area feels solid but of course I cannot really control any moisture absorption or expansion/contraction. Cannot raise floor level to place ply on top. Am I crazy thinking of this or might this work? Unfortunately tiles are big, 75 x 20 cm. Advice appreciated. Thanks, John.



Comments

  • #2
    e.r
    Registered Users, Registered Users 2 Posts: 421 ✭✭e.r


    If you haven’t tiled yet, used a cement based tanking kit. If you have , the adhesive may give up its bond over time as the resin in the osb will cause it



  • #3
    Dr_Colossus
    Registered Users, Registered Users 2 Posts: 3,163 ✭✭✭Dr_Colossus


    Could install a de-coupling membrane also (shouldn't rise the height of the floor more than a few mm's). Would prefer to install 6mm magnesium board, stuck and screwed to the OSB but if you're limited with the floor level then the de-coupling membrane should be thinner again.



  • #4
    rob316
    Registered Users, Registered Users 2 Posts: 18,288 ✭✭✭✭rob316


    No, OSB turns to mush with moisture. Put the thinnest cement backer board on the OSB you can get.



  • #5
    JonathanAl
    Registered Users Posts: 27 ✭JonathanAl


    thanks Lads, can you tell me dr colossus, whats a decoupling-membrane?



  • #6
    Dr_Colossus
    Registered Users, Registered Users 2 Posts: 3,163 ✭✭✭Dr_Colossus


    Number of different manufacturers, the Schluter brand is probably the most recognised but equally the more expensive. A lot of tile shops here now stock some variety whereas a number of years ago you had to import anything tile related that was out of the ordinary (I had a lot of trouble a few years ago importing epoxy grout for an ensuite, some tile shops offered to order it specifically but it was prohibitively expensive at €150+ per 4kg tub)

    https://www.tilingsuppliesdirect.co.uk/product-category/wetroom-systems/decoupling-membranes




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