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Unread 09-18-2019, 10:16 AM   #1
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Is this efflorescence?


We did a bathroom repair about a year ago. The client just came to us to tell us that there is mold growing in some of the grout, nda there is a white build-up in other areas (see pictures). The client says the white substance is pretty hard. The tile is limestone, and we used Tec power grout along with Tec AccuColor Caulk. Once everything was dry, we then sealed and polished everything. We always follow manufacturer guidelines. Underneath the newly repaired tile, we used Schluter water proofing products. Do you have any idea what the white substance may be, and why there would be mold growing in the grout?

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Unread 09-18-2019, 12:41 PM   #2
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Hi KJ,

The white does look like efflorescence. I don't know what the other stuff is. Almost looks like it's embedded.
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Unread 09-19-2019, 05:05 AM   #3
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Sometimes it's hard to tell folks they need to scrub their shower more often. I would start by telling them to put a few spoons of mild PH neutral dish soap and water in a spray bottle and work on scrubbing it down with a micro towel. It doesn't matter what the waterproofing is, if the conditions are right, mold will form. The shower door needs to be left open when not in use and more ventilation probably needs to be added to the bathroom.

Very few folks ever do it but it's best to dry the shower walls after each use. Doing that will help a lot to keep mold and soap scum away.

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Unread 09-19-2019, 07:47 AM   #4
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Looks like it could be calcium deposits..This is typical with hard water. Not necessary efflorescence.
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