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Old 04-15-2011, 10:11 AM   #1
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Tile Subfloor


I am putting ceramic tile in my kitchen. I have the floor stripped to its original 3/4 X 5 1/2 planks (actual size) over 16" on center joists. Can I put cement board directly over this, or do I need additional plywood or something over that. I would like to stay near my present height so as to not make the kitchen floor too much higher than the surrounding floors.

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Old 04-15-2011, 05:46 PM   #2
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If you are worried about the height difference you can lay down some exterior ply with wire mesh. First you have be sure that the floor boards are screwed down tight to the joists. Then use wood floor screws to secure the plywood down, and I mean screw the life out of it...6" min. on the joists and 2 to 4" on seams. Be sure to stagger the ply seams. Attach the mesh with galvanized staples or roofing nails. When you put the mesh down, be sure not to crush it by walking on it..use knee pads to prevent compression. Expect your tile thinset to vary in thickness as you install the tile and level as you go with a 4 ft level.

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Old 04-15-2011, 07:07 PM   #3
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I think one of the tile pros will weigh in; it was my understanding that the underlayment was not to be screwed to the joists, only the subfloor. Also, the wire mesh is not a recommended part of tile laying (although done frequently).
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Old 04-15-2011, 07:55 PM   #4
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Quote:
Originally Posted by bob22 View Post
I think one of the tile pros will weigh in; it was my understanding that the underlayment was not to be screwed to the joists, only the subfloor. Also, the wire mesh is not a recommended part of tile laying (although done frequently).
I am sure Bud and the rest will chime in also as I hope they will. but IMO there is no underlayment, strictly a substrate for tile adhesion, I suppose the OP could use ditra as well but the idea is to create a sound base over the existing floorboards while providing an even transition to the adjoining floor.
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Old 04-15-2011, 11:25 PM   #5
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Wire mesh is not accepted by any tile organization.
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Old 04-16-2011, 07:08 AM   #6
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Skip the wire mesh--there are better ways---
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Old 04-16-2011, 10:49 AM   #7
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