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Old 06-01-2012, 01:56 PM   #1
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How to level bathroom floor

Iíve ripped up the old bathroom floor down to the plywood and secured with 2.5 inch screws.

Iíve cut the 3 by 5 backer boards for the tile and laid them out on the floor and noticed that the floor is wavy and the backer boards do not lye perfectly flat.

The backer boards are not set in mortar or screwed down yet so my plan is to take them up and level the floor first.

Question, what is the proper way to level the floor? Iím not as concerned with level as I am with flat so the tile lays properly.

Can I use mortar to do the leveling, or do I need to use something else? And how long does it have to dry before I can cross check it in the opposite direction and then install the backer boards?

Thanks in advance for any advice


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Old 06-01-2012, 06:41 PM   #2
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What's there for a subfloor now?
Really should have checked the floor joist before installing the plywood.

You say it's wavy, but by how much?


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Old 06-01-2012, 07:25 PM   #3
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Typical method for flattening the floor---set the backer board unto a bed of mortar 1/4 x1/4 trowel or 1/4 x 3/8--then nail or screw that down--

Pack the wall/floor joint with foam roping---install a wax ring on the toilet flange as a dam--

then use a self leveling compound--be sure to prime the raw backer first--read the directions on the self leveling compound---

The stuff sets quickly and doesn't exactly 'self level' so spread it out fast and then let it float out--
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