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Old 08-26-2009, 01:19 PM   #1
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Tile over Concrete

Hello everyone, I would love to tile my basement bathroom floor but I have ran into a snag. After removing the existing vinyl flooring (roughly 20 years old), the grey backing and glue was left behind. I have tried everying to remove this and have spent approx. 12 plus hours only to remove 5% of the backing only, this is over 45 square feet!

Here is my question, will the new tile bond to this? If not, is it possible for me to put a subfloor over the slab to create a suitable bond?

All your help is greatly appreciated!!


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Old 08-27-2009, 07:29 AM   #2
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Tile over Concrete

I assume you tried solvent like lacquer thinner, alcohol, paint thinner, paint remover, USE A RESPIRATOR!!! not a dust mask. If nothing softens it, then I would bed an isolation membrane in thinset, and tile over that.

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Old 08-27-2009, 08:42 AM   #3
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Tile over Concrete

Do you mean Ditra?
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Old 08-27-2009, 05:50 PM   #4
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Tile over Concrete

NEVER, NEVER, NEVER, use a solvent to try to remove that adhesive. The tile industry frowns on such things. Using a solvent based cleaner will not allow the tiles to bond to the substrate. To say nothing of the health hazards and risks of explosion that are created.

I can tell you moose that all of that product can be removed by simply scraping it. All that will remain is a staining of the concrete. After that there are tile thinset adhesives available that can be used with just such a situation.

Wet the floor, let it soak a little, and the felt will scrape up easily. Once the felt is gone the remainder can be cleaned/scraped using a 3 to 4 inch razorblade type scraper with a long handle. Sometimes they are called wallpaper scrapers.

In more than thirty years of removing those products from floors I have never had one floor that couldn't be cleaned down to the concrete doing just what I have suggested above.

Now get serious and get busy and let's go to work on making those blisters.
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