White grout changes color


Old 12-21-04, 07:24 AM
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White grout changes color

I have about six grout lines (around different tiles) in the shower stall that have turned a rust color. I tried to get rid of the lines by wiping down with bleach and did not work. I have replaced with white premix grout. After about 30 minutes some of these lines have the same type of rust color as before that bleeds thru the grout. I have re-raked the grout lines, wiped them down, waited for them to dry and re-applied the grout and the same thing happens. I don't think there is any moisture behind the tiles (the area is about shoulder level) but who knows. Any suggestions?

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Old 12-21-04, 01:11 PM
Join Date: Nov 2000
Location: Austin, TX
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Sounds like rust leaching from the fasteners used to install the backer board.

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