MY BOARDSERVER
 Subject: efflorescence
 
Author: michael
Date:   4/5/2011 10:38 pm 
What is Efflorescence?

Efflorescence is a whitish deposit on a stucco exterior.

In areas of the exterior where water tends to sit on the stucco, such as the eyebrow details over garage doors, efflorescence stains the paint surface, and it makes cracks and paint flaws highly visible. On stucco homes, paint quality is essential to the overall durability of the exterior finish. An inadequate paint film allows moisture from rain and splashing to wet the stucco. When the stucco isn't adequately hydrated, it reacts to the water with a short-term rise in the stucco's pH, resulting in the rising of salts in the stucco to the surface on the stucco. When salts in the stucco effloresce, they leave a whitish deposit on the surface of the stucco.


Cause 1:
Poorly hydrated stucco
If the stucco isn't properly hydrated, its pH level will be too high. The stucco will react to water from rainfall, splashing, and other sources with a short-term rise in pH, causing salts in the stucco to rise (effloresce) to the surface. When salts in the stucco effloresce, they leave a whitish deposit on the surface of the stucco.

Cause 2:
Lack of primer coat
If primer isn't applied, salts in the stucco can more easily effloresce and deposit themselves on the paint surface.

Cause 3:
Inadequate first and second coats
If an inadequate topcoat is applied, the coating may be too thin overall. A thinner paint film enables salts in the stucco to more easily effloresce and deposit themselves on the paint surface.

Cause 4:
Inconsistent application
Inconsistent spraying and backrolling can create thin areas in the paint coating. A thinner paint film enables salts in the stucco to more easily effloresce and deposit themselves on the paint surface.

Answer kindly provided by www.toolbelt.buildiq.com

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 Topics Author  Date      
 efflorescence    
michael 4/5/2011 10:38 pm 
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