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Old 11-25-2011, 03:31 PM   #1
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Raising level of floor with OSB


We are remodeling our kitchen, and will put down ceramic tile eventually. The kitchen is a bit lower than that floors in the rest of the house (we live on a slab -- apparently, the rest of the house has some sort of underlayment). I'd like to put down 1/2 inch OSB under the tile. I have a hammer drill, so I intend to screw the OSB to the concrete slab.
- How should I space the scews?
- How substantial of a screw should I use?
- Should I use some sort of adhesive as well?
-(part of the area had vinyl tile held down with some black, sticky stuff (called cut out, I think??), if I use adhesive, do I need to get this completely off, I hoped to just scrape it down and put the OSB over it)

I will appreciate all advice.
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Old 11-25-2011, 04:09 PM   #2
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Raising level of floor with OSB


I wouldn't put OSB on a slab. It will fall apart. And I wouldn't put ceramic on OSB on concrete.
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Old 11-25-2011, 05:01 PM   #3
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Raising level of floor with OSB


I've been doing a little reearch since I posted the question, and figured out OSB isn't the right thing to use here. Read some negative stuff about plywood too. What would be the right thing to use here?
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Old 11-25-2011, 05:52 PM   #4
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Raising level of floor with OSB


Thinset.....
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Old 11-25-2011, 05:59 PM   #5
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Raising level of floor with OSB


Thinset direct to the slab? Any way to raise the level?
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Old 11-25-2011, 06:24 PM   #6
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Raising level of floor with OSB


You could use kerdi xl.
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Old 11-25-2011, 10:58 PM   #7
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Raising level of floor with OSB


www.schluter.com/Schluter-DITRA-XL.aspx is what you need. This is the proper way to get the height you need. Use modified mortar under the Ditra and unmodified mortar to set the tile.
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