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Unread 12-01-2019, 01:39 PM   #1
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Concrete Surface Prep for Redgard Application

Hi folks!

Looking at tiling a patio that was enclosed by previous owner. Floor is concrete that was painted, and mostly peeled off.

I'm looking for advice on properly prepping this surface before applying Regard as a waterproofing measure. The concrete is grade level with no cracks and I'm primarily looking at waterproofing vs uncoupling. I'm concerned about the Regard bonding properly since there was/is paint on the concrete.

Would be followed by modified thinset application of tile.

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Unread 12-01-2019, 01:45 PM   #2
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What is the goal of the waterproofing? From underneath migrating into the living space?

Perform a water absorption test in several areas of the slab. If the water sets on top for 20 minutes without much being absorbed you'll fair well grinding the top of the slab to scarify.

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Unread 12-01-2019, 01:50 PM   #3
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Thanks for the response, the main waterproofing goal is because there were pavement ants in the space when we moved in. I believe they are gone but I 100% won't want moisture reaching the grout or thinset from below for them to chew into the tile job and invade the space.

I would prefer not to scarify the area just due to logistics of me not having the knowledge or money to hire.

Thank you
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Unread 12-01-2019, 05:37 PM   #4
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You can eliminate the grinding if the paint will come up with a razor blade scraper. The grinding Paul advised is going to be the fastest and easiest way to remove the paint.

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