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December 21 - December 31, 2010

Do I need to pay attention to the permeability of the coating when specifying coatings for the exteriors of CMU walls?

Selected Answers

From Chuck Pease of MMI Tank on January 6, 2011:
With out a doubt. Or you will soon be recoating after delamination occurs.

From Joseph Lstiburek of Building Science Corporation on December 21, 2010:
Yes, or the coatings blister. A good rule of thumb is 10 perms or greater as tested under ASTM E96 method A - the desiccant or dry cup method - in the dry film thickness of the actually applied coating. Note the operative phrase is "good rule of thumb." This is a conservative value and lower perm coatings can work but success is now dependent on both external and internal environmental conditions. For example an unconditioned warehouse in Denver could easily handle a lower perm coating - but a humidified data processing center in Denver could not.

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