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Laying tile over Carpet glue

Posted on 7/27/19 at 10:03 pm
Posted by TulaneUVA
Member since Jun 2005
26079 posts
Posted on 7/27/19 at 10:03 pm
I have a covered patio that had this ugly green carpet that I ripped up. The yellow glue is still there. Is it possible to still lay down tile over this without scraping it up?
Posted by gumbo2176
Member since May 2018
17884 posts
Posted on 7/27/19 at 10:11 pm to
I'd be leery of doing that from personal experience. I had vinyl tile in my man cave that I laid in the late 90's and used glue to put it down to the slab.

Well, Katrina threw almost 5 ft. of water in my ground floor and enough of the tiles came loose to warrant me ripping them all out.

I scraped as much of the old glue as I could with scrapers and decided to put down ceramic tile, used good thinset, laid the tiles, grouted and all was great-----for about 2 years then the tiles started letting loose and when I popped them up I noticed the thinset had a lot of the glue on the bottom surface, but was stuck very well to the tiles themselves.

You may need to get a concrete sander machine from a rental place to prep the slab properly.

Perhaps a good flooring specialist will see your post and respond. This is just my $.02 worth.
Posted by NATidefan
Two hours North of Birmingham
Member since Dec 2008
36582 posts
Posted on 7/27/19 at 10:40 pm to
From what I know about that kinda thing is that you should have a good prepped surface.. so yeah, scrape it up.

You can probably find a chemical to put on it and break it down so it comes up easier.

This post was edited on 7/27/19 at 10:45 pm
Posted by NATidefan
Two hours North of Birmingham
Member since Dec 2008
36582 posts
Posted on 7/27/19 at 10:43 pm to
From google.

quote:

The key to tile floor installations is proper subfloor cleaning; any contaminants on the subfloor can ruin the way the adhesivebonds, leaving your tile floor bumpy and unsafe. Tile cannot be installed over carpet, and all adhesive from the carpet must be removed before you can begin tiling


quote:

How to Lay Tile Over a Concrete Floor That Has Glue Residue From...

Use a long-handled scraper—like the kind made to remove ice—to get as much of the old adhesive off the floor as you can.

Apply a soy-based adhesive remover to any glue that is still clinging to the concrete. ...

Dry the floor completely with shop cloths or towels.




Posted by Jaben
Bham
Member since Dec 2017
44 posts
Posted on 7/28/19 at 12:09 am to
Without scrapping you are going to run into problems. I had something similar with cutback adhesive.

You need to go to harbor freight or Amazon and get scraper. It took me about two days using a long handled scraper and some water. Then use a modified adhesive like versabond available at HD.

Be careful with adhesive removers sometimes the oil base can keep the thinset from adhering.

You want to scrape until there is just a shade of residue left.
Posted by Hammertime
Will trade dowsing rod for titties
Member since Jan 2012
43031 posts
Posted on 7/28/19 at 12:45 am to
Try using a glue remover and big scraper. Last time I did it, I used aircraft stripper because that's what I had. It worked, but it's pretty toxic and will definitely burn you (I've done it multiple times). You're probably gonna have to etch or scratch the concrete surface to get good adhesion when laying tile after cleaning the glue up
Posted by cave canem
pullarius dominus
Member since Oct 2012
12186 posts
Posted on 7/28/19 at 1:34 am to
Go rent a walk-behind sander and it will be a short job.

make sure you clean it off well afterwords

I would also recommend throwing a bit of citric acid or vinegar down for a acid wash prior to applying thinset, but I only like doing things once.
Posted by fishfighter
RIP
Member since Apr 2008
40026 posts
Posted on 7/28/19 at 6:48 am to
No, the thinset will not stick.
Posted by Hammertime
Will trade dowsing rod for titties
Member since Jan 2012
43031 posts
Posted on 7/28/19 at 6:50 am to
The glue won't clog up the sandpaper?
Posted by Carville
Sunshine, LA
Member since Jun 2014
5321 posts
Posted on 7/28/19 at 7:18 am to
Better test that mastic for Asbestos.
Posted by Cracker
in a box
Member since Nov 2009
18895 posts
Posted on 7/28/19 at 12:15 pm to
Pour a self leveling resurfacer over it and walk away your time is worth what that stuff costs it’s not cheap but it will give you a flat surface quickly
Posted by Tigerlaff
FIGHTING out of the Carencro Sonic
Member since Jan 2010
21487 posts
Posted on 7/28/19 at 3:01 pm to
Gotta scrape it, unfortunately. Just did this a couple weeks ago.
This post was edited on 7/28/19 at 3:01 pm
Posted by TulaneUVA
Member since Jun 2005
26079 posts
Posted on 7/28/19 at 6:39 pm to
Cracker, never used self leveling concrete before. Do you think you could pour over the adhesive and then stain? Is it difficult to do for someone who’s never done it? I’m decently handy but not a ton of experience with concrete other then fence posts
This post was edited on 7/28/19 at 6:40 pm
Posted by cave canem
pullarius dominus
Member since Oct 2012
12186 posts
Posted on 7/29/19 at 12:23 am to
quote:

Pour a self leveling resurfacer over it and walk away your time is worth what that stuff costs it’s not cheap but it will give you a flat surface quickly




Depends on if you want to do this once or dont mind the practice because by about the 11th application you may have removed enough glue for it to hold, the adhesive has to be removed for self leveling to bond as well.

There are a few manufacturers that claim their product will bond with the adhesive but this is an outside project with lots of thermal expansion and contraction between what will be three layers of material at different rates.

Simply put if you want this to last long term and not look like a LA highway in 18 months get the glue up.

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