How do I level a wood sub floor prior to putting down a tile floor?

I have torn out the old tile and underneath was a concrete base about 1 1/2 inches thick. I tore out the old concrete and now I am checking the wood sub floor underneath and find it is not level. I planned on using 1/2 inch concrete board over the wood sub floor, but what do I do about the unlevel sub floor?

If your sub flooring leveling isn t a structural problem, do as Wood tick said. Only I d do it the other way, I d put down the 1/2 inch concrete board ( properly like he said) and THEN put a leveling compound over it. This way you don t need the primer and you ll be able to nail thru the cement board properly . You ll be able tile right over the cement board and leveling compound. Any questions you can e mail me thru my avatar and also check out my qualifications GL

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4 Responses to “ How do I level a wood sub floor prior to putting down a tile floor? ”

  1. rocksister says:

    I just had ceramic tile laid in my kitchen/dining area. The floor was not level in the dining area. We used backer board to build up to the desired level, minus about a quarter inch, then used leveling compound to bring it up level with the kitchen area. I have a step now, but it was necessary to get it level. You cannot use ceramic or laminate on a floor that is not VERY level, so be sure you get this step straight. If the floor is not VERY level when you get to the stage of laying down the tiles, you cannot lay them, they will crack open.
    References :

  2. woodtick314 says:

    Buy a STRAIGHT 10′ 2×4. Move it around the floor, noting any areas where there is more than 1/8" peak or valley. Fill the low spots with floor leveling compound, and if necessary sand down any high spots. After the subfloor is level, set your Durock in a bed of thinset, screw it down, and you are ready for tile. Hope this helps.
    References :

  3. Adrian C says:

    Who ever put 1/12" of concrete over a wooden floor should be taken to task, if your floor is that bad then take it up re level the joists clean away all the rotted wall plates (these are wooden strips that the ends of the joists rest on and they are also on the sleeper walls) the dispense with floor boards and use an 18mm plywood well screwed to the joists, invest in a couple of good quality battery drills or hire some in for drilling and screwing use turbo drive screws and you wont need to drill and countersink. Glue and screw pads below any unsupported joints glue one board only in case you have to lift a board. There are other good suggestions but maybe it is time to put it right may take longer but it will be a better job and you will be able to tile on top of the plywood which must be sealed first. Make sure all sub floor timbers are treated and spray areas that have been in contact with rotten timber good luck
    References :

  4. rob s says:

    If your sub flooring leveling isn t a structural problem, do as Wood tick said. Only I d do it the other way, I d put down the 1/2 inch concrete board ( properly like he said) and THEN put a leveling compound over it. This way you don t need the primer and you ll be able to nail thru the cement board properly . You ll be able tile right over the cement board and leveling compound. Any questions you can e mail me thru my avatar and also check out my qualifications GL
    References :
    20 years in flooring as a store owner/ installer

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