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Old 08-30-2011, 10:53 PM   #1
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Tile Over Concrete?


Probably won't start this project for a while, so I'm not in a rush. I want to do this one right.

I want to tile one laundry room room (~60 sq ft) that sits slab-on-grade, where I believe I should have at least 4" of thickness. The foundation is probably nearly 50 years old, and I haven't seen any water problems on this side of the house yet. It currently has very old sheet vinyl that is wearing through and peeling in spots.

I'll remove a section in the morning and tape down a piece of plastic wrap. Assuming the adhestive comes up, is not tacky, there are no moisture issues, and no major settling cracks or other unevenness...

...is it just a simple matter of mixing a modified thinset, laying it on, placing the tile, and then grouting later?

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Old 08-31-2011, 04:35 AM   #2
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Tile Over Concrete?


That's about it---stable concrete is about the easiest and safest surface to install tile on.

Getting the old sheet goods off will take longer than installing the tile.

A cheap multi tool will aid in removal.

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Old 08-31-2011, 11:05 PM   #3
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Tile Over Concrete?


Was considering a multi-tool. Probably a cheap beater to start off, like the one at Harbor Freight or the one on Amazon.

Do you find the variable speed to be important on one? The HF one thats locked at 21,000 oscillations/min is only about $20, and might come with a few attachments.
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Old 09-01-2011, 05:49 AM   #4
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Tile Over Concrete?


I've got the variable speed one---good tool but the variable speed is not needed and never used.

I've heard good things about the $20 model----one thing to remember --Each brand uses only that brand of blade---HF blades are about half the price of other brands.
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Old 09-01-2011, 08:42 AM   #5
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Tile Over Concrete?


Oh'Mike is spot on, as usual.

I've got a cheap-crap multi-tool I bought on clearance from Menards. I needed it for one small job, but now I use the dumb thing ALL THE TIME. Mine has "universal fit" blades, so they can be bought about anywhere.

Personally, if it were my project, I'd rent a power floor scraper to get up the linoleum & adhesive. In my opinion, it'll be the best $40 you ever spend.


As Mike said, laying tile on a good concrete slab is about as easy as it gets. Basic tools can be had pretty cheaply, and the end result can be very satisfying.

Be sure to hop on here with any questions, when you actually get ready to lay the tile.
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Old 09-01-2011, 12:00 PM   #6
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Tile Over Concrete?


I don't think it will be a problem getting it up, to be honest. There's holes worn right through in places!

Cutting out a 12x12 section today for the moisture test. Will take a pic once I finish.
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Old 09-01-2011, 12:32 PM   #7
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Tile Over Concrete?


The form of moisture testing you suggest won't really tell you anything and won't serve any purpose if you intend to install ceramic tile. Even with some moisture present ceramic tile will be fine because it can still breathe through the grout joints to expel (evaporate) any moisture that is there or will come along in the future.
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Old 09-01-2011, 12:33 PM   #8
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D'oh!

Thanks, you just saved me an hour of my day.
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Old 09-01-2011, 12:41 PM   #9
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Yow...unless your concrete is constantly weeping water droplets year-round I wouldn't worry about it. Ceramic tile is the one floor covering that doesn't usually care about a little moisture. I would suggest that you plan on using a Portland cement grout however to aide in any evaporation that may be necessary down the road. Stay away from urethane grouts in this case.
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Old 09-01-2011, 12:42 PM   #10
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Tile Over Concrete?


Got it! Now off to see how stuck on it is...
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Old 09-01-2011, 12:47 PM   #11
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Tile Over Concrete?


JUst went in an peeled a small patch up with my fingers in a few places. The top layer will be exceedingly easy to remove.

The bottom layer looks like a thick paper glued down. It scraped right off with my fingernail. I can't imagine a bladed scraper having much difficulty, especially if it were wet.

The concrete surface appears to be pretty darn smooth... a former garage floor. Don't think it's honed though.
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Old 09-03-2011, 10:27 PM   #12
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Tile Over Concrete?


Just to be safe you may want to have that old flooring and adhesive checked to be sure they don't contain asbestos. That's about the right age where they might. It's probably going to be non-fryable so removing won't be an issue but disposal may be.
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Old 09-04-2011, 12:42 AM   #13
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Tile Over Concrete?


The pattern looks to be a late 70s/early 80s style. I'm not overly concerned with it containing asbestos.
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Old 09-08-2011, 03:35 PM   #14
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Tile Over Concrete?


Quote:
Originally Posted by Thadius856 View Post
The pattern looks to be a late 70s/early 80s style. I'm not overly concerned with it containing asbestos.
Why would you think that? Asbestos was very common into the 80's.

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