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Old 03-23-2011, 02:57 PM   #1
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How to fix wavy plywood subfloor?


Hello,

I am remodeling my bathroom. After I removed floor tiles and underlayment I found that old plywood subfloor is OK, but a little wavy in some areas. I am going to put a cement Durock Board underlayment and tiles on top of it, but first I would like to fix it. I cannot replace it, so I am thinking about using some kind of floor patch and leveler in some areas of the plywood. Can someone recommend me any good floor patch or floor leveler for my job?
I have Home Depot and Lowes in my area.

Thanks a lot in advance.

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Old 03-23-2011, 03:08 PM   #2
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How to fix wavy plywood subfloor?


I am getting ready to tile my kitchen and have been reading a lot on the tile sites. How wavy is the floor? Most of the guys that know tile say the thinset you put down under the cement board is to fill in the voids under it so its supported, not to stick it to the subfloor. I guess it fills in all the valleys when you screw it down. The do say if the floor needs to be leveled to do it after the cementboard is down.

Dan

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Old 03-23-2011, 04:21 PM   #3
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How to fix wavy plywood subfloor?


If you have wide voids you can use a floor leveling compound like a latacrete. But like danT ( I like your name) said: you can normally take care of it after the concrete board is down. Even better you could do a Mud Set and that would level the floor.
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Old 03-24-2011, 06:53 AM   #4
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How to fix wavy plywood subfloor?


I have waves just in few areas. I am wondering if I can use shims to support cement boards in some areas before I put down thinset and cement boards?
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Old 03-25-2011, 02:29 PM   #5
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How to fix wavy plywood subfloor?


If they are just slight waves, the thinset is there to fill the voids, not secure it to the floor. The cement board shouldn't follow the waves unless it is really thin board, it's not really meant to bend. Of course, it depends on the actual depth of the "wave" and over what distance.
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