I am tiling my bathroom floor and have followed advice to fit 12mm marine ply over the new waterproof boarding also just fitted. The problem is the standard ply is 607mm wide and the joists are 400mm centres. Do I need to line up the joins on the ply with the joist to avoid flexing or will the board floor plus 12mm ply be strong enough to have joins anywhere between the joists on to the board (the board floor runs across the joists and the ply runs with the joists (as advised). Or will I need to cut every ply board to 400mmm wide.
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