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Old 09-09-2014, 12:24 PM   #16
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The ole "tape the plastic to the floor" is basically a meaningless test. Sure the process can tell you if moisture is present somewhere at some recent time but as already stated it doesn't really tell you where the moisture came from.

Now that you have moved the buckets and noticed moisture existing under the buckets you no longer need to do the "tape the plastic to the floor test" you already have your answer. The plastic taped to the floor will result in the same discovery you made when moving the buckets. But what have you learned? NOTHING!

If you want a better test use a CaCl Test, this will tell you the moisture content (if any). Moisture may not be an issue, the amount of moisture could be an issue.

Now...Please ANSWER THIS QUESTION:
What type of tile are you planning to use???????
Is it ceramic or is it vinyl tile?

Have I missed the answer somewhere?
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Old 09-09-2014, 03:42 PM   #17
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Fairview,

Thank you for the explanation - now THAT makes sense.

The other thing I found out last night is under the tubs they have not closed up the slab so there is dirt around the drains and the slab is essentially open in those areas. Not sure if this makes any difference or not.

I come from the desert on the other side of the world. We don't have water let alone humidity. This is all new to me. I am just trying to ensure that when we get to the point of laying tile and putting in cabinets etc I am not going to compromise it by putting it on a slab that has retained too much moisture especially when half of it is covered in a waterproof glue and it is after a not so normal water intrusion event.

Everything I have read states to do the plastic test and then, if that is positive take It to the next level and do the calcium chloride test to see how much there is. It sounds like I may get a false positive on the plastic just because its humid and there is no ac right now.

Bud, the plan is ceramic tile. I apologize, I think of tile as the stony stuff and vinyl as just vinyl regardless of the format.

Robyn
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Old 09-09-2014, 05:30 PM   #18
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Quote:
Originally Posted by forcedreno2012 View Post
Bud, the plan is ceramic tile. I apologize, I think of tile as the stony stuff and vinyl as just vinyl regardless of the format.
Robyn
Thank you...
Now moving right along.

I am going to suggest that; "You are worrying too much, needlessly".

Ceramic tile and the thinset used to install it is very friendly when it comes to a little moisture intrusion/migration (when installed over concrete), intrusion which I personally think
you-have-none-of to amount to anything, based on all of your comments.

When installed over a wood structure the tile installation is of course subject to whatever the reaction of the wood is.

Use an unmodified thinset and you will be fine. Once the tile is "set" give it 48 hours before grouting it.

You could do an isolation membrane using Schluter DITRA and eliminate most of the worries for good.

Be sure to keep your insurance premiums paid up.
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Old 09-09-2014, 08:30 PM   #19
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Well I guess its a moot point now anyway

Apparently under all the glue is a steel troweled slab. It looks almost polished. I did the water test for absorption and after an hour the water is still beaded sitting proud like water on glass. Hasn't absorbed any of it. There isn't even a mark where it was when I wiped it up. I am not sure If it was sealed or if it is just the finish or residual from the glue but it looks like thin set won't adhere anyway. I guess that answers the moisture question and why everything looks wet.
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Old 09-09-2014, 09:01 PM   #20
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Quote:
Originally Posted by forcedreno2012 View Post
Well I guess its a moot point now anyway

Apparently under all the glue is a steel troweled slab. It looks almost polished. I did the water test for absorption and after an hour the water is still beaded sitting proud like water on glass. Hasn't absorbed any of it. There isn't even a mark where it was when I wiped it up. I am not sure If it was sealed or if it is just the finish or residual from the glue but it looks like thin set won't adhere anyway. I guess that answers the moisture question and why everything looks wet.
Yup the concrete has apparently been sealed, whether purposely or accidental it is sealed. Now the only thing that remains to insure the success of a ceramic tile installation is to abrade the concrete. Bead-blast, sand-blast, grind.
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