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Efflorescence - Mottling:
Efflorescence is the
formation of 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 walls from
the inside.
Solution:
If excess moisture is the cause, eliminate the source by
repairing the roof, cleaning gutters and downspouts and
sealing any cracks in the masonry using a 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 all efflorescence and
loose material from the masonry with a wire brush, power
brush or power washer; then rinse. Apply a masonry sealer
and allow it to dry completely; then apply a coat of top
quality exterior house paint, masonry paint. |
