Bubble in stucco w/powder substance

Discussion in 'Bricks, Masonry and Concrete' started by perkins_j99, Apr 18, 2011.

  1. Apr 18, 2011 #1

    perkins_j99

    perkins_j99

    perkins_j99

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    Hoping someone can point me in the right direction with an issue I am having with my house. The house was constructed in 1963 and the last exterior paint job was probably about 8 years ago. In various places on the exterior bubbles in the paint are appearing. Behind the bubbles is a powdery white substance that easily scrapes off down to the cement (sorry if "cement" is incorrect term).

    Here's a picture of a bubble before I open it up:
    [​IMG]

    Here's a couple pictures of the bubble after peeling away the paint:
    [​IMG]
    [​IMG]

    And, finally, here's a picture of the area with the white powdery substance scraped away:
    [​IMG]

    I would like to correct this issue before I get into real trouble with damage but need to know what its doing before I can correct it. Thanks in advance for your help.
     
  2. Apr 19, 2011 #2

    CSmith

    CSmith

    CSmith

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    ItÂ’s called Efflorescence, which is basically mineral salt left behind as moisture comes through the wall and evaporates.
     

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