Gray grout is turning white

sparklebreadJanuary 11, 2013

Our bathroom floor was grouted Tuesday. This evening I noticed areas that appear to be turning white. Any idea what this is and the cause?

This is the second issue we had with the floor. The first time the tile was laid, the floor was not level. It was a complete tear out thanks to guidance I received on this forum. I really don't want to go to the contractor with this until I have a good understanding of what this is and a remedy if there is one. Grout used was mapei warm gray with grout boost. The shower was grouted (warm gray) a few weeks back and it does not appear to have this problem.

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A couple possible causes could be either latex leaching or efflorescence. We experienced efflorescence - it's where the minerals in the subfloor below the tile rise through the grout and leave a white residue on the surface. Our grout turned orange in several spots from the iron, and still has sort of a white-ish residue.

    Bookmark   January 12, 2013 at 5:58PM
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Thanks Pip! You are referring to the hex marble floors, correct? I love both your bathrooms and I know it probably drove you crazy when the grout stared to turn. Did you all try any remedies or just live with your grout discoloration?

    Bookmark   January 12, 2013 at 7:14PM
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Yes, the efflorescence affected my marble hex floors in our shower. I read online that a mixture of vinegar and water can alleviate the problem, but I didn't try that on our marble. I took a toothbrush to it with some very hot water and scrubbed, and it's definitely better, but not completely gone. The orange stains worked themselves out after a few weeks, but the grout still shows some white spots you look closely at it.

    Bookmark   January 13, 2013 at 12:02AM
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Just wanted to report back~ the installer believes this is thinset that has risen to the top of the grout. He is going to dig/cut out the thinset spots and regrout.

    Bookmark   February 4, 2013 at 7:51PM
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