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If you want the most durable and long-lasting tile floor possible, make sure your subfloor is solid. Before installing 1/4″ or 1/2″ cement board, make sure the floor doesn’t make any sounds.
Examine all the plywood seams using a straightedge by holding it perpendicularly to the seams. If there appears to be “teetering-tottering” over any joints, use a belt sander to sand down the ridge to make it level with the floor.
Thin-set is what will give your cement board an even, and void-free surface to lay on. Most people think it’s for bonding (which it does), but really the screws are what holds it down the most.