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Old 08-03-2009, 12:22 PM   #1
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Black residue

I have removed the old tiles from my bathroom (from 1973) and there is a very thin black residue on about 90% of the concrete. I'm going to put in ceramic tiles and need to know if I need to somehow remove this residue. It is almost like a stain, or something VERY thin. By the way, the old tiles were under some self-stick ones. While removing the self-stick tiles these other old tiles just lifted without any problem. I sure would appreciate any suggestions or information that could be shared about this.


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Old 08-04-2009, 08:15 AM   #2
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Black residue

Install your new ceramic tile using "modified thinset tile mortar" suitable for use over "cutback adhesive", no big deal.


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Old 08-04-2009, 10:39 PM   #3
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Black residue

Absolutely no problem, we've done it hundreds of tile. You should cut this black adhesive with a razor cutter, it's called a wallpaper scraper. Do not sand or use any chemical. You'll be OK when you can almost see the concrete. Use a good quality modified thin set that states it's OK over "cut-back" residue, as Bud said.

The scrapper looks like this;

Tile 4 You LLC Troy, MI

DITRA Installs - KERDI Watertight-Mold-Free Showers. I have NEVER made a mistake, I thought I did ONCE, but, I was WRONG! A+ BBB rating - est. 1987 - over 50 yrs. exp.
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Old 08-19-2009, 02:35 PM   #4
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Black residue

Followed your advice and finished the job Monday.
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