I am thinking of tiling the bathroom (1.9M * 1.7M). The floor is 18mm (green) tounge and groove chipboard, and seems very solid, although it is not screwed down.
Based on what I've read I think I may need to overboard with 12mm wbp ply.
I am however a little worried by the weight - 18mm + 12mm + 8mm (tiles) + 3mm (BAL) = 41mm onto 7"* 2.5" joists approx 14" inches apart. Are they adequate for this weight?
Also, if I screw down the chipboard do I really need to overply? The chipboard is ony three pieces (600mm depth * the width of the room) and, seems totally firm even without screws.
Many thanks for your advice.
Based on what I've read I think I may need to overboard with 12mm wbp ply.
I am however a little worried by the weight - 18mm + 12mm + 8mm (tiles) + 3mm (BAL) = 41mm onto 7"* 2.5" joists approx 14" inches apart. Are they adequate for this weight?
Also, if I screw down the chipboard do I really need to overply? The chipboard is ony three pieces (600mm depth * the width of the room) and, seems totally firm even without screws.
Many thanks for your advice.