Originally Posted By: clawrenson
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Spalling + Masonry References (scroll down on the web page)
Spalling is a loss of surface material due to moisture infiltration. It occurs when moisture inside the brick expands and contracts due to thermal action and when moisture evaporates at the surface of the brick.
Added from their website: Brick Spalling is Almost Impossible to Repair:
In some cases, individual bricks may be removed from the wall, cleaned, and reinstalled with the damaged face to the inside of the wall. Where spalling is severe, and reversing the bricks is not possible, remedial efforts may be taken to save the remaining fabric of the material. Remedial measures include application of a water-repellent coating or the application of paint that matches the original brick color. Application of protective coatings is not generally recommended but if used, the coating should be breathable and should not significantly alter the brick finish. If salvaged or replica bricks can be obtained, severely damaged brick may be replaced.
Ontario Home Inspections Inc.