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Efflorescence on Basement wall

4633 Views 5 Replies 4 Participants Last post by  Ameri-Dry Guy
I am trying to finish my basement and did a lot of prep-work before putting up the insulation to the concrete wall. I plan to use XPS (extruded polystyrene) and then frame in front of it.

In inspecting the wall, I noticed an area of the wall that was discolored and had about 2 feet of crack. I started tapping on it and picking the crack with a chisel. It started to crumble. So, I decided to patch it with hydraulic cement patch. Well, that was 2 weeks ago.

Last night, I started to work on other things and notice the hydraulic cement patch is covered by white powder (see attached picture). I think it is efflorescence.

I am confused on how the efflorescence could appear on the patch only, but not on the surrounding existing concrete, or on other parts of the basement.

Do you think I have a big problem?
Since I will cover the wall with XPS (extruded polystyrene) panels, do you think I should worry about it?

Wall Concrete Moth Floor Insect
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Well Nick, I think you should be fine, depending on the manufacturer of the hydraulic cement it could very well just be a not so good batch or depending on when you put the patch on it could have absorbed some ground water before it cured and it is just leaching the lime out. I would scrape it down and paint it with drylock and call it a day.

-Ameri-Dry Guy
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