after water


Old 04-27-08, 01:26 PM
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after water

I have been in my home 1 year. I was told the darker shiny spots in concrete basement floor was waterproofing. About a month ago I had about 1/4 inch water in one area of the basement. I vacumed the water up and washed the floor and dried it with a fan. Now the darker areas have a gray film on them and when I scrape it - it is a white flaky substance. Can anybody tell me what the problem is and what to do about it? Thanks for your time.
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Old 04-27-08, 03:25 PM
Join Date: Oct 2006
Location: Wilmington
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What you describe sounds like efflourescence, lime leaching from the concrete due to moisture. New House, or old?? Newer construction usually requires a heat/moisture barrier under a slab. This is usually more obvious on walls than on the floor. If a new house, the problem is likely due to poor drainage due to settlement of grading around the house, or gutter/downspouts not getting the water away from the foundations. Regrading(adding soil around the foundation) and adding to the downspouts often corrects this problem.

It is possible that none of the above is the problem, that the slab is sitting on a high groundwater table. If that is the case, there is no inexpensive cure.

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