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Old 09-17-2007, 07:32 AM   #1
jseibert
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Do I need to scarify old concrete slab?

Hi, Thanks in advance for any help!

We are tiling an older house in Phoenix that also has a newer addition. The older part of the house has original concrete floors that we have been told had color added in the top most layer. It doesn't appear to be sealed in any way however, and is now about 70 years old. The new section was poured about a year ago.

Our plan is to do some grinding and SLC in the old section to get flatness, but wonder if we need to scarify or "shotblast"? the rest of the area?

We will be putting in 20" ceramic tile - most likely using Mapei Ultracontact (based on stuff I've read here).

Thanks,
Jane
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Old 09-17-2007, 07:59 AM   #2
Brian in San Diego
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Jane,

Welocome to the forum. You may get some opposing opinions but I am of the opinion if the surface is flat, has no glue residue or paint on it and passes the water absorption test then you should be able to set tile on it. I might add it should be free of cracks as well.

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Old 09-17-2007, 09:47 AM   #3
jay f
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Many colorants for concrete, especially after the concrete is finished, are an acid based product. Checking for water absorbtion is a must, but scarifying or shotblasting is not a bad idea, it will only increase the bonding surface. Just a thought.
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Old 09-17-2007, 09:59 AM   #4
tileguytodd
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I cant disagree with anything ive read.....I, Like Brian do not believe in buying any more work than is actually required to complete a project.

Do the absorption test first.

Ultracontact is a good choice for your large format tile.
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Old 09-17-2007, 12:42 PM   #5
jseibert
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Seems like it would be nice not to have to scarify.... when we do this water test, is there an amount of time for absorption that is too much? Are we talking seconds? minutes? And is there a specific amount of water? drops? a cup?

sorry to be dense!
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Old 09-17-2007, 05:21 PM   #6
jadnashua
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You don't need to flood the floor...a few drops big enough to not evaporate in a moment or so...see if they are absorbed into the floor or end up just sitting there like on a newly waxed car.
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