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cheers @rodabod - will go 12mm marine ply with all the flexibles and see what happens. Thanks again.
cheers @rodabod - will go 12mm marine ply with all the flexibles and see what happens. Thanks again.
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.