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The Legend; Phil Hobson RIP
do you mean the old style floorboards Phil, as opposed to t&g chipboard flooring?
Doug, I use this method on small areas only, 9mm wpb ply screwed at 6" centres, then Hardie board 6mm glued and screwed using Keraquick with latex plus. Then tiles fixed with Keraquick with latex plus, on T&G floorboards or chipboard (providing no deflection)