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Old 04-09-2013, 09:34 PM   #1
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Bathroom floor


So I'm pulling up the tile in the bathroom and in the process the cement board is getting damaged. I'm assuming this needs to be replaced? Do I put plywood under the cement board? How do I fasten them? What about a toilet flange? What about thickness? Thanks

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Old 04-09-2013, 10:29 PM   #2
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Yes it should be replaced in this case if it is dinged up pretty good.

Is there not plywood under now?

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Old 04-09-2013, 10:41 PM   #3
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Originally Posted by Windows on Wash
Yes it should be replaced in this case if it is dinged up pretty good.

Is there not plywood under now?
Yup it's pretty bad. There is no plywood under the concrete. The house is a pier and beam built in the early 40's. this is a real can of worms I've opened! Lol
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Old 04-10-2013, 07:15 AM   #4
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Bathroom floor


Old house, bathroom, of cource it's a can of worms. It always is.
Undersized joist, to long a span, spaced to far apart, 1 X 6 subflooring, plumbing running right through big holes cut in the joist.
Fungus growing on the joist, no flange on the toilet, supply lines coming up through the floor instead of the walls, no vent, old steel and cast iron rusted out plumbing, shut offs no longer work.
Tile over old plaster or sheetrock with no water proofing.
All the joys and to be expected when working on an old house.
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Old 04-10-2013, 09:53 AM   #5
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Lmao!!! Yup the lengths people go to in order to half ass something. I'm glad I'm not the only one in this boat.
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Old 04-10-2013, 11:09 AM   #6
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Bathroom floor


I've seen tile layed over hardwood floors, linolium, louon, partical board, 5/4 decking boards.
All failed.
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Old 04-11-2013, 04:14 AM   #7
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Moved to Flooring forum.
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Old 04-11-2013, 07:10 AM   #8
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Bathroom floor


Cement board is not really a structural element. The joists and subfloor must provide all the stiffness you need. If your floor isn't sturdy, then you should rip out all the cement board and then put down additional plywood.

Cement board accomplishes a few things, like being a good surface to bond to, creating a flat surface (assuming thinset was properly applied beneath it), and having a shrinking and expansion rate closer to tile than plywood.

If you're going to rip it out, I'd use Ditra instead of cement board. It has a lot of advantages.
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Old 04-11-2013, 07:46 AM   #9
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Originally Posted by jeffnc
Cement board is not really a structural element. The joists and subfloor must provide all the stiffness you need. If your floor isn't sturdy, then you should rip out all the cement board and then put down additional plywood.

Cement board accomplishes a few things, like being a good surface to bond to, creating a flat surface (assuming thinset was properly applied beneath it), and having a shrinking and expansion rate closer to tile than plywood.

If you're going to rip it out, I'd use Ditra instead of cement board. It has a lot of advantages.
Thanks for the tip. Ill be tearing everything out and replacing the bad.

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