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  • Not OSB, but ply. I think you may need to go for thicker than 6mm. I think we possibly used 12mm. Flexible Mapei adhesive and flexible grout.

    Alternatively, there is matting which you can use (I seem to recall it's orange). I couldn't find any.

  • Forgot to say, and it may sound obvious, but make sure none of your floorboards are creaky. Screw them down anywhere if need be.

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