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Unread 11-03-2012, 03:22 PM   #1
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Ceramic Tile Flooring Prep

I'm installing ceramic tile on a floor that previously had hardwood flooring glued to the slab floor. Does all the old glue have to be removed???
Lots of opinions on this
I will probably use versabond thin set
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Unread 11-03-2012, 04:58 PM   #2
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yes you want all the glue removed. any chunks of glue will be a pain to set tile over as it will not allow the tile to lay flat to the ground. not to mention that the left over glue residue may be a bond breaker between the concrete and thinset.

the best way to remove the glue is razor scrape any large patches off then hit the whole floor with an angle grinder and a diamond cup wheel.
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Unread 11-04-2012, 09:37 AM   #3
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Hi Mike,

I'll go just a little in the other direction. If the glue is solvent base, not water soluble, and you don't have a moisture problem in the slab, I think you can leave some of the glue on the slab. VersaBond will stick to it.
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Unread 11-05-2012, 11:21 AM   #4
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While Versabond may stick to the old carpet gluse we do not recommend bonding to the old adhesive. Versabond will develop the best bond to clean concrete. If the glue is left in place the bond to the concrete will only be as good as the old carpet glue that may continue to degrade over time and weaken the bond. We suggest that you scrape up the old glue and make sure the concrete will accept water, before installing tile with Versabond.
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Unread 12-14-2012, 11:37 AM   #5
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Ceramic tile thinset advice

Installing 300 ft if 16 x16 ceramic on slab floor. Ok condition aside from glue that I need to get off. Another story.
Most convenient place to buy my thin set is HD. Their top 2 choices that I saw where Flexbond at $28 a bag and Versabond at $14 a bag.
Is Flexbond overkill for my application in your opinion or is Versabond fine?
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Unread 12-14-2012, 01:03 PM   #6
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Mike, it'll help if you'll keep all your project questions on one thread so folks can see what you're working on and what's been previously asked and answered.

If your concrete has now been properly prepared, and if you've decided to bond your tiles directly to the concrete, either of those mortars will work.

Your choice.

My opinion; worth price charged.
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Unread 12-14-2012, 01:18 PM   #7
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The glue left on the floor is from a Bruce hardwood flooring installation and rip up. There was Bruce wood flooring adhesive and some liquid nails too
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Unread 12-15-2012, 07:19 AM   #8
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Don't know why the mod decided to combine two different questions into one thread. I can't even follow it now.
I'm asking about recommendations on thinset now, not glue removal.
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Unread 12-15-2012, 09:48 AM   #9
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See post #6, Mike.
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Unread 12-15-2012, 10:13 AM   #10
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Scrape or grind it off with a diamond cup wheel mounted to your right angle grinder.
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Unread 01-03-2013, 09:05 AM   #11
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Cleaning Glue off slab

I don't understand why you can tile over sheet flooring but not over the glue left behind on the slab. Everyone seems to say no.
There must be a better way to get the residual flooring and the glue off. I'm figuring it takes about an hr to do 4 - 6 sq ft tops. I am using a 4 in razor scrapper purchased at HD with some extra blades. Works ok for 3 or 4 minutes until the blade needs to be either changed or sharpened with a grinder. Water helps but still ridiculous in the effort and time department.
Grinding is way too messy and doesn't seem to be all that much faster.
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Unread 01-03-2013, 02:23 PM   #12
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Hi Mike, some glues will dissolve with water reason that you don't want to stick thinset that is mixed with water because it will loosen the glue. A scarifier hooked onto a shop vac works good on removing the glue.
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Unread 01-03-2013, 05:51 PM   #13
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Any advice on liquid nails? I'm doing ok on the glued down vinyl, but under some ripped up wood Bruce flooring there is liquid nails. It is down really good and water has no effect like the vinyl glue. Heating it works, but it melts into the concrete too which I know isn't good
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Unread 01-03-2013, 05:58 PM   #14
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i doubt its liquid nails under the hardwood flooring. its most likely hardwood flooring glue which is diffrent then liquid nails.the reason i say its not liquid nail is because most times as you pull something up thats been glued with it is the glue comes up with it leaving only a mark on the floor where it was.. i would rip the hard wood up with a pry bar or something and scrape the glue to get any major deposits of it off. then use the grinder mike suggested to remove all the glue thats down.
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Unread 01-03-2013, 08:19 PM   #15
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It is liquid nails because I did it. I know, dumb.
It was a small repair to a larger floor that I did many years ago. The rest of the floor had the Bruce flooring adhesive and I've removed what didn't come up with the floor. The liquid nails is really bad to get off
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