Subfloor leveling for laminate or ceramic tile

Old 07-30-01, 05:09 PM
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Would like to replace and existing ceramic floor with laminate or new ceramic tile. The existing floor has 5/8" OSB subfloor with additional 3/8" plywood plus thinset
and tile. There seems to be a problem with the levelness of the flooring. (Cracking tile/grout) It seems that in the basement additional rooms were built after the original construction, directly under this floor. The builder apparently pounded the frames into place pushing up on the joists creating a rise in at least two of the joists. The area of the floor that is lifted is about 10' by 16' (with 16' being length of the joists). The joists are 2"x8" at 16" centers. Is it possible to remove the subfloor, plane about a half inch off the two joists (without damaging the
structural integrity of the floor), replace the plywood and then use a Portland based cement to level the rest of the floor to within 3/16" over a 6 foot space as specified
by the Pergo manufacturer spec... Or level and add 1/4" durock for a tile installtion??? Does any one have any experience with this. I would hate to have to rip up the floor and just put vinyl down!!!
Old 07-31-01, 08:01 PM
Join Date: Aug 2000
Location: USA
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Unlevel subfloor

This sounds pretty complicated. I would have two or three professional contractors take a look at your situation and get estimates. Pick their brains to learn what should be done to do the job right. Consider if it is something you really want to do yourself or if it would be worth it to hire someone to do.

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