We are installing ceramic tile on a substrate that has some adhesive residue, carpet was glued to a contrete floor. The carpet has been removed but there is still some adhesive residue on the concrete. Is it necessary to scrape off the adhesive before applying thinset? Will the tiles lift if we dont?
2007-08-28 05:14:13 · 7 answers · asked by Bond 5 in Home & Garden ➔ Do It Yourself (DIY)
the adhesive is on fairly thin, my knuckles are killing me.
2007-08-28 05:37:56 · update #1
there are chemicals that wil help remove the adhesive. most of them are noxious. you need to get the adhesive off, the tiles will not stick properly if you leave it. liquify and wipe up with virgin paint thinner will cause respiratory issues and youll black out. muriatic acid will cause chemical burns and respiratory issues and is a real pain to use, anything solvent based will cause an oily surface that will not help the thinset stick. perhaps you could use a leveling compound applied to entire surface? a flat scraper can do a lot to get the bulk of it off. if the adhesive is a sticky kind you are in trouble but if its hard and not sticky (hopefully the yellow kind) you may be able to knock off the high stuff and press on with the tile job. -good luck!
PS ***IMPORTANT*** dont mix certain chemicals- can cause poisonous gases READ THE LABELS!!!
2007-08-28 05:38:56 · answer #1 · answered by Jeff G 1 · 1⤊ 0⤋
All I can say is: its probably not a great idea to put it right on top. It becomes more likely for it to come up. And then the process of taking up a layer of laminate and a layer of ceramic tile would be that much harder when it came about. I think the only way to make that work without taking up the ceramic tile is to make an air tight seal between the 2. I couldn't give you any ideas on how to do that though.
2016-05-20 00:52:59 · answer #2 · answered by ? 3 · 0⤊ 0⤋
Yes the residue most be removed to get a good "seal" to the thinset.
2007-08-28 05:22:53 · answer #3 · answered by thirsty mind 6 · 0⤊ 0⤋
Is it smooth concrete? I have had pretty decent luck with Goo Gone and one of those razor blade scrapers. If it is rough concrete, it may be worth looking into installing a new subfloor on top of the concrete.
2007-08-28 07:27:10 · answer #4 · answered by Fresh 2 · 0⤊ 0⤋
Yes, the thinset will not bond to old glue.
2007-08-28 05:51:59 · answer #5 · answered by Anonymous · 0⤊ 0⤋
You do need to scrape it off. Even worse than not sticking is if they are up on a lump and have an edge sticking up that you can trip on.
2007-08-28 05:28:33 · answer #6 · answered by Rich Z 7 · 0⤊ 0⤋
gotta use hardybacker on floors or if it ever gets wet it will start popping up the tiles
2007-08-28 07:42:51 · answer #7 · answered by redsky_too_nite 3 · 0⤊ 0⤋