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chobio 11-04-2011 09:21 PM

ceramic tile on bouncy floor
I am about to install ceramic tile for small laundry room In my basement.

Now, 5/8 plywood has been nailed to concrete slab.
But I found some part of the plywood is little bouncy even if I put more nails.(may be the plywood is pretty rigid and the slab is uneven.)

Is there any way to secure the subfloor before installing ceramic tile?

And, what type of underlayment or backer board do I use?
Wire mesh? cement board? dentshield board? Or another layer of plywood to stop bounce?

Thanks for your advise!

DannyT 11-04-2011 09:28 PM

normally you just tile directly to the concrete.

rusty baker 11-04-2011 09:29 PM

First thing is take up the plywood.

plowboy 11-04-2011 09:53 PM

Wood on concrete will rot. Take up all wood and use thinset mortar to set tile. Use a 1/4 by 1/4 trowel to spread mortar.

JazMan 11-04-2011 10:23 PM

I definitely agree you need to remove the wood and tile either on the concrete or over a membrane such as Ditra.

Use the trowel that is appropriate for the tiles you're installing.


chobio 11-05-2011 04:47 PM

Thanks guys
Thanks for all the reply, guys.
Actually, I forgot to say that there is dimple membrane between concrete slab and plywood. So, I don't have to remove the plywood, do I?
I am about to install ceramic tile.
Do I need cement board or something before thin set mortar? This small room is going to be laundry room.

Bud Cline 11-05-2011 04:54 PM

Chobio did you come here for answers or do you just want to make new rules as you go? Listen to these guys. You can not install tile over what you have there and plywood should never be installed over concrete.:)

:scooter:<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

fixrite 11-07-2011 09:27 AM

I think he might be trying to say that there is drycore down over the concrete. Just a thought.

JazMan 11-07-2011 10:12 AM

I don't think he's referring to Dry-Core, but no matter. You can't tile over Dry-Core either. Even with plywood and concrete backer over it.


fixrite 11-07-2011 10:57 AM

Hey Jaz. I did a little looking and according to dricore's website, you can. I have read many of your posting on here and respect your opinion very much, so please don't think I am trying to be a smart azz or anything like that. Here is a link to it, They do mention that one would need to install cement board over it as well as securing it to the flooring with screws. I guess it would be something that could be done but generally not the best choice is what I gather from it all. Once again I am not trying to be a smart azz.

Bud Cline 11-07-2011 12:58 PM

Dricore is one of those products that wants to be all things to all people. If one were not to follow their recommendations to the letter, tile on Dricore would not work out very well. We have people coming here all of the time that want to take short cuts or save money or argue about prescribed proven methods. Not saying that is the case here but just sayin'. If some specific measures are incorporated in a project such as this, it ain't gonna work.:)

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