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home Fix label D.I.Y label_important General D.I.Y

white powdery substance on garage floor?

I have been washing and washing my garage floor, using bleach, pinesol, anything I can to kill mold or mildew. Now I have decided this is not mold or mildew, but something coming from the cement floor itself. What can I do to get it to stop. It truly looks like mold. I live in Hawaii, and walking barefooted leaves foot marks, and floor always looks dirlty.
J. M. Leal, June 2010
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It's called Effllorescence.
It's caused by waterborne salts passing through the masonry.
It happens in new builds when the cement was allowed to get wet, but it usually dries out after a few weeks or months dependent on climate.
If it's continuous it means there is water seepage through the floor from groundwater.
Was a waterproof damp course installed before laying the concrete?

Big Softy, June 2010

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