we have recently pulled up some old laminate flooring in our kitchen and found that there had clearly been a flood of some sort because there was a large area of blackness and dry rot. we've had a preservation firm in to treat the area and also replace some worn out floor boards. i now need to lay plywood down and tile the floor.
my questions are -
a) what thickness of plywood should i lay down to ensure that no movement occurs beneath the tiles? should i screw or nail the plywood? and how far between each nail/screw?
b) should i lay a damp proof / waterproof membrane beneath the plywood to avoid any further damage from flooding via washine machine etc?
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