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Underlayment for going over concrete



"Underlayment for going over concrete," in the Floor Preparation forum, begins: "Ok here is my problem. 15 years ago I put down a vinyl floor in a rental house over concrete ..."

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Old January 4, 2010, 07:11 PM   #1
davi701
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Underlayment for going over concrete


Ok here is my problem. 15 years ago I put down a vinyl floor in a rental house over concrete with a luan underlayment it held up great till there was a leak they did not tell me about. The only reason that I had to replace it was because the luan delaminated and I was afraid that it may have molded. Is there an underlayment to replace the plywood that would hold up better? Or should I just spend the extra money and install ceramic tile?

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Old January 5, 2010, 06:51 AM   #2
Darol Wester
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Re: Underlayment for going over concrete


Is there a reason that you don't want to install the vinyl on the cement? If it's in good shape, that would be the way to go.

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Old January 5, 2010, 09:49 AM   #3
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Re: Underlayment for going over concrete


If you installed vinyl with underlayment yourself it sounds like you're a handy guy. I would go for installing tile and not running the risk of replacing the floor again. But like dobby said, if the concrete can be scraped and patched to a smooth surface then it would be good to just go over the concrete.

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Old January 5, 2010, 10:17 AM   #4
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Re: Underlayment for going over concrete


I have to say I have NEVER seen wood underlayment last long term sandwiched between concrete and vinyl!!!! The inherent slab moisture however slight will always attack the wood, in my experience.

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Old January 5, 2010, 05:31 PM   #5
davi701
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Re: Underlayment for going over concrete


The concrete is not in the greatest shape and looking at it I will have to be careful with tile. It will take some leveling and I wonder if it will be much leveling compound. Making it to thick. But I know very little about tile.

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Old January 5, 2010, 05:42 PM   #6
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Re: Underlayment for going over concrete


I do not like doing the following but I have done it with no problems several times. You can install one of the smoother tile backerboards with an appropriate tile thinset, then weight, and/or spot nail with concrete nails (to hold it down till the thinset sets). Then do the minimal prep to the joints with an appropriate floor patching compound and install the vinyl per manu's specs.

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Old January 5, 2010, 06:28 PM   #7
Darol Wester
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Re: Underlayment for going over concrete


davi701 said View Post
The concrete is not in the greatest shape and looking at it I will have to be careful with tile. It will take some leveling and I wonder if it will be much leveling compound. Making it to thick. But I know very little about tile.
Can you give us a little info on just what the cement is doing, such as, is it crumbling/coming apart, not very flat/poorly done, etc.???

Also, how did you originally attach the luan to it? When you pulled it up, did it pull up any of the cement with it? Just curious.

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Old January 6, 2010, 01:10 AM   #8
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Re: Underlayment for going over concrete


Hire a professional

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Old January 6, 2010, 05:29 PM   #9
davi701
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Re: Underlayment for going over concrete


barrycarlton said View Post
I do not like doing the following but I have done it with no problems several times. You can install one of the smoother tile backerboards with an appropriate tile thinset, then weight, and/or spot nail with concrete nails (to hold it down till the thinset sets). Then do the minimal prep to the joints with an appropriate floor patching compound and install the vinyl per manu's specs.
I glued the luan down and it took some hard labor to remove it. But the concrete is solid but has a crack in it that I had sanded down with a floor sander before and has not shifted in the 15 years. The big problem is by the toilet the concrete is raised about 1/2 inch. When I laid the vinyl I just trimmed the luan and feathered it in around the toilet. Worked fine and looked fine. I had thought about the backer board but was told it would not work but I thought if you can glue it to concrete why not the backer board. Thanks for all the input you all are great!

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