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  1. #1
    Join Date
    Apr 2009
    Location
    Idaho
    Posts
    14

    Default Efflorescence, Latex Leaching, or what?

    On the backsplash around the counter in my master bathroom, there is a white powder that has formed on the grout between the tiles. It appears to only form on the grout. It has formed several times over the last few years and my wife usually just brushes or washes it off. The tile is behind the sinks in the counter but the grout and tiles do not get wet. I have the same tile and grout in the master shower and no white powder forms there where the grout is subjected to a lot of moisture.

    Any ideas as to what this white powder may be and how to prevent it from forming? I have heard that sealing the grout may help. I have no idea whether the grout was sealed when it was installed. Is that a solution or is there something else?

  2. #2
    Join Date
    Apr 2009
    Location
    Idaho
    Posts
    14

    Default Re: Efflorescence, Latex Leaching, or what?

    I couldn't post pictures with the original post because I have not posted 10 times. This should be number 9.

  3. #3
    Join Date
    Apr 2009
    Location
    Idaho
    Posts
    14

    Default Re: Efflorescence, Latex Leaching, or what?

    And number 10. Kind of ridiculous to not be able to post a picture to show the problem because I have not posted enough times.

  4. #4
    Join Date
    Apr 2009
    Location
    Idaho
    Posts
    14

    Default Re: Efflorescence, Latex Leaching, or what?

    Ok, here are some pictures.







    Thanks for any answers you might give me.

  5. #5
    Join Date
    Mar 2008
    Location
    nova scotia, canada
    Posts
    1,522

    Default Re: Efflorescence, Latex Leaching, or what?

    that does look like efflorence. but based on where it is the first thing that comes to mind is that there might be a leak behind the wall causing the drywall to breakdown so the gypsum is coming through. its kinda hard to say without actually seeing it in person

    push in on the wall directly above the tile does the drywall feel spongy at all you dont need much force
    fire up the saw and make some dust

  6. #6
    Join Date
    Aug 2007
    Posts
    6,481

    Default Re: Efflorescence, Latex Leaching, or what?

    I agree, it looks like efflorescence, but given where it's at this should NOT be the case. Efflorescence comes from moisture wicking through cement, bringing with it the minerals trapped within. This is most commonly seen in basements with earth contact on the outside and high water tables. You should not have this problem on a bathroom wall, especially if over drywall.

    It is possible that high humidity could be pulling the salts through the grout, but even that seems very unlikely.
    I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!

  7. #7
    Join Date
    Apr 2009
    Location
    Idaho
    Posts
    14

    Default Re: Efflorescence, Latex Leaching, or what?

    It looked like efflorescence to me, too. There are no pipes behind the tile to leak. The bathroom does have high humidity after showers are taken. There is never condensation on the tile or grout after showers. Seal the grout?

  8. #8
    Join Date
    Dec 2010
    Location
    Houston Texas
    Posts
    2,360

    Default Re: Efflorescence, Latex Leaching, or what?

    Seal the grout and turn the vent on or open the winder

  9. #9
    Join Date
    Jan 2012
    Posts
    1

    Default Re: Efflorescence, Latex Leaching, or what?

    i think latex

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