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All coat concrete and masonry facades contain some flaw (e.g. hairline cracks, porous substrate); these are weak spots where moisture can penetrate into the substrate. The substrate must be able to dry out whenever ambient conditions permit otherwise spalling or other deleterious damage will occur. In addition, dry substrates do not promote the growth of mold and mildew.
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Why should one coat concrete and masonry facades with a breathable (water vapor permeable) coating system?
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