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Old 11-29-2011, 12:23 PM   #1
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Problem with concrete floor prep for ceramic tile install


I have 12"x12" ceramic tile I am trying to install in a new bath in my baesment...about 1/3 of the 12'x5' (roughly 2 rows along the wall behind the sink and toliet) room was fresh concrete from the pluming I installed. The rest was a grey painted floor. I cleaned the floor and fresh concrete areas, but the tile adhesive did not set or dry at all where I applied it the over the painted area. (I did allow 24+ hrs of drying)...I pulled/ cleaned up all the tile, scraped the emulsified paint and glue off the floor, tried to re-apply and set one piece of tile again to see if area was cleaned enough, but glue still will not set/dry...

Do I need to sand/clean the floor??....and if so, with what type of sandpaper/cleaner?.....about 10 or so of these pieces I installed are all solidly down, because that is where the fresh concrete is, and the glue set and dried to that very well. I would have put some kind of backer board down first, had I known I would run into this problem, now I would like to find a solution that doesnt invlove removing the 10 or 12 pieces I have down that are ok, and totally starting from scratch.

Thanks for any help you all can give!

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Old 11-29-2011, 12:50 PM   #2
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Problem with concrete floor prep for ceramic tile install


Probably using the wrong tile adhesive.

What exactly are you using - NAME IT.
I hope it isn't in a plastic tub.

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Old 11-29-2011, 02:08 PM   #3
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Probably using the wrong tile adhesive.

What exactly are you using - NAME IT.
I hope it isn't in a plastic tub.

Home Depot set me up with Acrylpro, first, Yes, it was in a tub.....now I am using Flex Bond, in a Bag.
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Old 11-29-2011, 03:45 PM   #4
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Problem with concrete floor prep for ceramic tile install


Acrylpro is the WRONG adhesive. It will never dry under those circumstances.

FlexBond also would not be the best product to use under the circumstances, it will also take a long time to dry.

CustomBlend would be a better choice.

Modified thinsets such as FlexBond require air to dry. When it is applied to two impervious surfaces it can't get the required air and there is no absorption into the substrate. It takes a long time.

Unmodified thinsets however such as Custom Blend will dry (cure) on their own chemically and don't require air.

Never ask Home Depot employees for advice.
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Old 11-30-2011, 02:08 PM   #5
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Acrylpro is the WRONG adhesive. It will never dry under those circumstances.

FlexBond also would not be the best product to use under the circumstances, it will also take a long time to dry.

CustomBlend would be a better choice.

Modified thinsets such as FlexBond require air to dry. When it is applied to two impervious surfaces it can't get the required air and there is no absorption into the substrate. It takes a long time.

Unmodified thinsets however such as Custom Blend will dry (cure) on their own chemically and don't require air.

Never ask Home Depot employees for advice.

Where do I find this CustomBlend??
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Old 11-30-2011, 02:36 PM   #6
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Problem with concrete floor prep for ceramic tile install


Never use pre-mixed products on floors especially concrete floors.

Nothing was gonna work right on the painted areas. I guess you skipped reading the directions part?

You'll need to prepare that floor before you continue. Might be easier to start over including removing the tiles that seem OK too.

Custom Blend is down the aisle at the same "bad advice" store, but I'm not so sure you should use that. We consider it one step above dirt as a thinset. Plus, it's likely that your tiles are "porcelain" ceramic which require a modified thinset instead.

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Old 11-30-2011, 02:44 PM   #7
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Porcelain tiles over DITRA don't require a modified thinset!
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Old 11-30-2011, 10:31 PM   #8
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Porcelain tiles over DITRA don't require a modified thinset!
Well of course not, we all know that. But Don (?) isn't using Ditra, he's tiling direct on concrete.

Good suggestion to start over and install Ditra though.

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Old 11-30-2011, 11:12 PM   #9
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Problem with concrete floor prep for ceramic tile install


Same-o same-o, when it comes to why thinsets will or won't cure under the circumstances.

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