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Unread 03-24-2008, 11:51 AM   #1
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Subfloor Not Level/Flat

I am attempting to correct an out of level/ unflat OSB sublfoor for porcelain tile or marble. The 3/4" OSB is laid over 2x4 sleepers 16 o.c. over a concrete slab. The mfg tells me that self leveler is not engineered to adhere to OSB, so I came up with the plan illustrated below.

Will this work? Is it overkill? Any other suggestions?

You suggestions are most gratefully appreciated.


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Unread 03-24-2008, 01:38 PM   #2
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Your plan is good for porcelain tile. For marble, you need another layer of plywood.
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Unread 03-24-2008, 04:56 PM   #3
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Some SLC's can be installed over OSB, but as noted, stone tile needs a second layer of plywood offset from the base layer. SLC over a wood subfloor needs to be 1/2" thick over the highest point, so a different leveler may be called for.
Jim DeBruycker
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