Efflorescence / Mottling Paint

Efflorescence / Mottling

Crusty, white salt deposits, leached from mortar or
masonry as water passes through it.

Possible Causes
Failure to adequately prepare surface by removing all
previous efflorescence.
Excess moisture escaping through the exterior masonry
walls from behind.

Solution
If excess moisture is the cause, eliminate the source by repairing the roof, cleaning out
gutters and downspouts, and sealing any cracks in the masonry with a high quality,
water-based all-acrylic or siliconized acrylic caulk. If moist air is originating inside the
building, consider installing vents or exhaust fans, especially in kitchen, bathroom and
laundry areas. Remove the efflorescence and all other loose material with a wire brush,
power brush or power washer; then thoroughly rinse the surface. Apply a quality
water-based or solvent-based masonry sealer or primer, and allow it to dry completely; then
apply a coat of top quality exterior house paint, masonry

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