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Old 10-18-2007, 10:52 PM   #16
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Need Tiling Advise

Looks like you should have space for tile, 1/2" backer, 2 layers of thinset and 1/4 - 3/8 plywood there.

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Old 10-19-2007, 12:56 AM   #17
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Need Tiling Advise


Just as I thought. You're screwed! You have to install another layer of 5/8" plywood underlayment. It needs to be exposure 1 grade C/C/ plugged or better. Do NOT buy CDX grade, it is not for subfloors, it's for sheathing. Once it's properly installed you can then install either a 1/4" backer board or an isolation membrane such as Ditra. Then your tiles.

BTW, you can not install anything directly over a single 1/2" ply, not even carpeting.


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