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The Legend; Phil Hobson RIP
No.. but neither would i tile to 9mm ply.. imo it isn't stable enough and infact i no longer tile to any thickness ply..
I use cement boards instead..
I'm with Dave on this, cement boards glued and screwed for me. I screw at 150mm centres, while adhesive(keraquick & latex plus imo) is still wet. when set ,the floor should be tight as a drum. Good luck