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I am planning to install ceramic tiles with a "Warmup" heating element beneath them. My first step is to install 1/4" insulation boards on the concrete floor using non-modified thin-set. The floor previously was covered with "peel and stick" tiles that were installed in the late 70s. When I removed the tiles, the glue residue is still evident (the cement floor is tacky when you walk on it). My questions are: - must I remove the remaining adhesive from the floor. If so, how do I best do this? - Is there a type of thin-set that will work well without removing the adhesive?

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Do you have a picture? And how thick is the adhesive? –  DMoore Aug 5 '13 at 16:54
    
I have a picture but as a first-time user, I am uncertain how to attach it to my original question (or this response!). The adhesive certainly is not thick, but is tacky to the touch. I just returned from the hardware store and they suggested a product called Circa 1850 bio degluer. After applying, the glue can be scrapped off. I am investigating this option further to better understand how this product works –  Herb Martin Aug 5 '13 at 19:42
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