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Old 11-03-2007, 11:32 PM   #1
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Prepping concrete for tile


I have a concrete slab foundation that I would like to install ceramic tile on. There is a lot of black residue from the old asbestos tiles. (I didn't remove them) I had the residue tested and it is not asbestos.

I tried scraping it off with a heavy 6" scraper, which you'll see in the photos of the area. It isn't coming off unless I bang on it with the edge of the blade. Is there an easier way of doing this? Something I can apply to make it come off a bit easier? Without making it impossible for the thinset to stick?







And a close up so you can better see what I'm dealing with.



And in case you want a bit of background on what is going on, we had a flood early in the year. The previous owner put in a bathroom upstairs and tapped a 2 1/2" PVC drain into a 1 3/4" galvanized steel pipe. Needless to say, I clogged the kitchen sink, past where the pipes all meet and we had the contents of upstairs bathroom floating in our kitchen. It's taken a while, but as you can see, we had the plumbing fixed. (Ended up getting a new water main put in too, since ours was corroded. No wonder the tap water was awful) Anyway, we get to put in a new kitchen. Before I head into the living room.

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Old 11-04-2007, 09:47 AM   #2
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Prepping concrete for tile


The product you are dealing with is called cutback. Here is a link to some options for removing it. http://johnbridge.com/vbulletin/showthread.php?t=12850

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Old 11-06-2007, 12:23 AM   #3
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Prepping concrete for tile


Cool, thanks. Good stuff in that thread. I think I'll go for the Flexbond after making sure the loose stuff is off the floor.
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Old 11-07-2007, 12:01 AM   #4
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Prepping concrete for tile


Another question in relation to this. The floor is very smooth, so I bought an angle grinder with a masonry wheel (I'm sure I'll need more than one) to rough it up. As I was reading the instructions, it mentioned wire brushes and how they can be used to clean concrete. Is it possible to remove the cutback using a wire brush on an angle grinder?

I will have my shopvac running while I hit the floor with the grinder to keep the dust levels down. And as I said before, no asbestos in the cutback.
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Old 11-07-2007, 12:35 PM   #5
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Prepping concrete for tile


The only bad thing will be is that you are going to stir up quite a bit of dust. The Diamond Cups they talk about on that forum are different than a wire wheel. The cups they are talking about are like this http://www.masterwholesale.com/shop/...ding-Cups.html .
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Old 11-07-2007, 12:49 PM   #6
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Prepping concrete for tile


This is similar to what I purchased:

http://www.lowes.com/lowes/lkn?actio...524&lpage=none

It wasn't dewalt, but I think it was a Norton brand item.

I have no problem with the dust, I'll seal off the kitchen area and keep the shopvac running close to the grinder to catch most of it.

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