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Unread 04-10-2007, 11:50 AM   #1
GoJackets
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Tiling over painted cinderblock wall

Help!
We are putting up decorative tiles (children's handprints) inside a school.

The tiles are 8x8's. The wall is cinderblock and has been painted multiple times.

Sandblasting is not an option for paint removal due to the dust - nor is pressure washing since this is indoors.

Scraping the paint has little effect other than the very top layer.

Some advice on my options is appreciated:
a) Rough up the paint on the wall and attach tile directly to wall. What sort of adhesive would work in this case?

b) Furr out the wall and attach cement backerboard (if I do this, what is the best way to attach the furring strips - maybe butterfly wall anchors?). This amount of weight supported only by screws makes me a tad nervous.

I prefer a), but don't want to see tiles come crashing down to the floor.

Thanks in advance for any advice!
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Unread 04-10-2007, 01:22 PM   #2
dgunnels
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I'm not sure we have quite enough info to answer properly. Is this just decorative? Are these all going to be together like a mosaicor randomly placed on the wall? Are you planning on grouting?

I will take a shot. If this is just a decorative thing and the tiles are going to be randomly placed and not grouted then I would say stick them up there with liquid nails. They will NEVER come down.

Anything else, you are going to have to wait for a pro or someone with lots more experience to chime is.
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Unread 04-10-2007, 01:42 PM   #3
GoJackets
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Decorative - but this will look like a section of wall

The finished product will look like a ceramic tile wall about 5' tall and 10' wide with a wooden border.
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Unread 04-10-2007, 01:47 PM   #4
Scooter
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I'd love to sandblast, presure wash, or even use methelyne choride, but inside a school, well that presents a whole host of new problems.

Given that this isn't a wet location, I think I'd just rough up the area and use a good quality modified thinset. I think the tiles will stick fine. Thinset is amazing stuff. If they fall, it is likely that it would be in 10 years after your retirement.
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