Damaged subfloor while demoing, how bad do you think it is?

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Old 02-12-14, 07:49 AM
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Damaged subfloor while demoing, how bad do you think it is?

I was demoing the old floor and accidentally damaged the subfloor. Since I will be tiling and putting down cement board is the damage large enough to worry about?
 
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Old 02-12-14, 08:07 AM
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I'd be more concerned with what looks like the plywood not being T & G and what size floor joist where used.
Going to have to a another layer of at least 1/2 subfloor rated plywood over what's there now to stop the flexing.
 
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Old 02-12-14, 08:52 AM
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You would do another 1/2" plus the cement board and then tile? Unfortunately I will be getting pretty high then. Does cement board flex that much? I should note that the foundation that is all on is cement.

The tiles will be 20x20

Again, thanks
 
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Old 02-12-14, 11:49 AM
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Cement board makes a good base for tile but has little if any structural value! If you are concerned about the height you could use Ditra instead of cement board.
 
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Old 02-12-14, 06:39 PM
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Focus should not be on height. You removed particle board flooring and need to replace before installing tile. I would go with minimum 3/4" T&G. 20" x 20" tile need a very sturdy and steady subfloor. Cement Board Underlayment does only one thing, create a good bond for tile and isolate the tile from the subfloor which is not a good bonding substrate for the tile. It adds Zero structural integrity to the floor system. What you have under it is what matters. You need to beef up the subfloor that you damaged.
 
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Old 02-12-14, 09:32 PM
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Sure hope I'm missing something.
Back up, what's under this plywood?
Did you say it was laid over the slab?
 
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Old 02-13-14, 09:19 AM
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That I'm not 100 percent sure of. From what I can tell there is a couple more sheets of plywood before getting to the cement slab. I'm not sure if he did this to raise the floor. It's weird though because in some spots it flexes and in others it's solid.

Hate to just start cutting holes
 
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Old 02-13-14, 02:03 PM
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Originally Posted by krummel21
Hate to just start cutting holes
I think you'd better cut some holes and figure out what's under there and why it flexes. Otherwise you'll be redoing this floor again too soon, or at least repairing it.

Ply on concrete is worse than a terrible method for a floor. Let us know what you've got in detail.

Jaz
 
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