Concrete, stucco, brick and other masonry surfaces may have a white, powdery substance on them known as efflorescence.

You can brush away this powder with a wire brush, but unless you eliminate the cause, it will return--and it's existence indicates that more serious moisture damage may occur. Efflorescence is caused by moisture from poor drainage, roof leaks, sprinklers, and the like that penetrates walls and other masonry surfaces.

You may also notice a white powder on some brick veneer. This is called efflorescence. You can clean the efflorescence by washing it and scrubbing it with a brush. If your bricks are grimy, use a little TSP in warm water to wash them. Be sure to rinse away all the TSP as it may leave a residue or stain.

If you can't determine and repair the source of the moisture, call a masonry or concrete contractor.

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