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DHTiling
Don't use the ply.. it holds less weight and is subjective to more thermal and humidity expansion .. as long as the PB isn't skimmed and not painted,then tile onto the PB..
I seen last week on site, 20mm stone fixed to double layed plasterboard. The stone was 600x1200, finished height 1200mm. The glue behind them was around 10mm. Is this feasible with the 2xplasterboard and that height, or is it inevitable to have problems?