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Unread 09-01-2011, 09:15 AM   #1
seadubya
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basement slab question

Hello all,

I have been looking through the many threads and have a new question that I can hopefully get some help with.

Our basement floor is concrete and in the past it looks like a new floor drain was put in the laundry room. But the floor wasn't finished and left with what looks like floor patch on it. The change in elevation from the laundry room to the hall is about 3/4". I am wondering my options for making the floors flat (not necessarily perfectly level) before tiling. Floor patch is quite expensive compared to standard brick mortar. Can I fill the valley with brick mortar before tiling over top?

Also there is a small hairline crack in the hall, would redgard crack stabilizer be my best option there? Crack hasn't moved since we noticed it, and the slab is bone dry. Thanks for your help! Clint
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Unread 09-01-2011, 09:43 AM   #2
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You can bond deck mud to the slab for a lot less money and effort than using brick mortar. You will want to use an antifracture membrane over the repaired area as a precaution. Use the same membrane in the hall, provided that crack is level on both sides. Redgard would work.
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Unread 09-01-2011, 10:24 AM   #3
seadubya
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Hi Bob!

Thanks for the speedy reply.
Is that the same Deck Mud that I have seen in this forum?

w.johnbridge.com/how-to/deck-mud

Does the slab need any prep to enhance the bonding?


Cheers! Clint
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Unread 09-01-2011, 10:29 AM   #4
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Hi again.

I forgot to mention that there was a VCT tile in an area I want to cover, can redgard be applied directly over cutback adhesive? haven't found a definitive answer on the inter-web.

Thanks again!
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Unread 09-01-2011, 11:12 AM   #5
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Same ol' deck mud.

The cutback needs to be removed down to a slight stain on the concrete. Scrape the bulk up with a razor scraper, then scarify the concrete with an angle grinder or shot blaster.
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Unread 09-01-2011, 12:41 PM   #6
seadubya
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Local tile shop recommended this stuff.

You ever heard of it? Says it will prime the cutback for thin set mortar so you can tile right over the old cutback. I wonder if the redgard will agree with it. What's your opinion?
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Last edited by cx; 09-01-2011 at 12:46 PM. Reason: repair link
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Unread 09-01-2011, 12:41 PM   #7
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oops there should be a www at the start of that link.
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Unread 09-01-2011, 12:45 PM   #8
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Not sure what you did with that link, Clint, but it's perfectly acceptable to just post the url as a hot link on our forums.

I'm not at all familiar with that product.
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Unread 09-01-2011, 12:46 PM   #9
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That stuff requires the same prep I described earlier. There are no shortcuts.
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Unread 09-01-2011, 03:13 PM   #10
seadubya
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Thanks CX. Good to know.

Gentlemen I present this for your analysis. http://www.buildingsystems.basf.com/...cs/FFC_TDG.pdf

Flooring wholesale shop here in town says it covers cutback and anything for prep for laying tile or other cementuous (sp?) products. Skim coats or built up to 1/2" thick at a time.

What I'm thinking about is skim coating the cutback with the chemrex, using the deck mud to repair my elevation issue, and coating the whole shebang with redgard as a crack preventer, and to stabilize the small hairline crack I mentioned before.

I am open for ridicule if you see fit. I hear you loud and clear when you say there are no shortcuts, but in 2011 we have to have the technology, Don't we?

I welcome all comments and criticisms. Thanks!
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Unread 09-01-2011, 04:45 PM   #11
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Clint, if you like the verbal assurances from your flooring wholesaler better than the written guidelines from the product manufacturer, go for it, say I.

Manufacturer says as follows, in part:

Quote:
Originally Posted by Chemrex Levelprep
How to Apply
Surface Preparation
1. Areas to be finished or repaired must be clean,
structurally sound, and free of all loose, dirty, oily and
scaly material, or any material that may
affect proper bonding. Dust, dirt, oil, or other
contaminates must be thoroughly vacuumed and
extracted from concrete.
2. Remove all curing compounds, sealers, waxes,
paints, and patching compounds. Mechanical
abrasion may be required for thorough removal.
3. Do not use acid etching, solvents, or sweeping
compounds for surface preparation.


6. Before the application of CHEMREX® LevelPrep™,
all existing adhesive residues over concrete must be
tested for water solubility to ensure they will not
react with the new flooring adhesive. Also, the new
flooring adhesive must not be sensitive to bleed
through of the cutback adhesive. Wet scrape the
existing adhesive to a well-bonded residue using the
technique outlined by the Resilient Floor Covering
Institute. Existing patches must be completely
removed by mechanical means
Quote:
Originally Posted by Clint
I am open for ridicule if you see fit. I hear you loud and clear when you say there are no shortcuts, but in 2011 we have to have the technology, Don't we?
No one deals in ridicule on this site. At least not more than once. We just try to give our visitors the facts concerning their proposed installations.

My opinion; worth price charged.
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Unread 09-01-2011, 09:08 PM   #12
seadubya
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I must be missing something....

"CHEMREX® LevelPrepTM is used to finish and smooth fully cured concrete, wood underlayments, linoleum (residential), ceramic tile, and adhesives including cutback...........
......Designed around a Portland cement- based matrix, CHEMREX® LevelPrepTM is a rapid-setting, aggregate-free, polymer-modified cement-based finishing underlayment."


and under the where to use they state.

"• Skim coating over adhesive residue (cutback included) that is thin, well bonded, structurally sound and non-water soluble"



what is wet-scraping btw?? could they be referring to different adhesives besides cutback?


No one deals in ridicule on this site. At least not more than once. We just try to give our visitors the facts concerning their proposed installations.

I read the "grout tutorial" and all the responses to the gent who washes his sponges in the laundry washer. I know we're all having fun...
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Last edited by seadubya; 09-01-2011 at 09:10 PM. Reason: added quotes
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