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Old 03-15-2019, 05:42 PM   #1
Becky1984
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Concrete backerboard

Hi! I am new here and need some help. I recently had brand new concrete backer board professionally installed on my tub walls. I have a close friend who is a DIYer who supposedly knew how to tile. Well, long story short, he did an awful job. The next morning, I was so upset that I just tore it all down. I did the best I could to clean it up but some of the adhesive had already dried. The concrete board was not damage, is it possible to sand down what didn't come off when I removed the tile? I really don't want to have to pay for it again. I've already beat myself up about it but just want to fix what I can and wait until I can get it done correctly and salvage what I can in the meantime.

Thanks!
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Old 03-15-2019, 07:24 PM   #2
Davy
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Sure, you can sand or grind it off but it's probably faster and easier to replace it with new. Did he apply a moisture barrier to the cement board?
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Old 03-15-2019, 07:49 PM   #3
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Welcome, Becky.

Photos can be very helpful with questions such as this. Use the paper-clip icon above the Reply dialog box to attach photos from storage on your computer.

What adhesive was used to set the tiles?
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Old 03-16-2019, 09:01 AM   #4
Becky1984
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Yes. Redgard was applied before the tile placement. I really canít afford to replace the boards again. I know I made the mistake trusting someone who isnít a professional. Iíve already beat myself up about it. This bathroom hasnít functioned for 10 years. I was saving to get it fixed and never expected this. Iíve attached a few pictures.
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Old 03-16-2019, 09:13 AM   #5
Becky1984
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This is the adhesive that was applied.
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Old 03-16-2019, 09:21 AM   #6
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I don't know if scrubbing with hot water will remove it. You might try. I'm afraid doing much grinding will damage the Redgard.
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Old 03-16-2019, 09:59 AM   #7
Becky1984
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Thanks for your help. Iím so beyond sick about it. This was a person I truly trusted and now itís going to cost me so much more in the long run.
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Old 03-16-2019, 11:07 AM   #8
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Not a pro, but I think people here generally advise against mastic in almost all applications. Might be better next time to mix yourself.
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Old 03-19-2019, 09:53 AM   #9
BillNC
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Becky, how much of the RedGard pulled off with the tile? You might need another coat of RedGard.

You might want to call the 800 number on that bucket and ask for advice about:

1 - What is the best way to remov the remaining adhesive? Offer to email pictures.

2 - Once I get any bumps in the remaining adhesive removed, can I apply another coat of RedGard over the remaining adhesive?

Goof luck.

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