Spalling occurs when hydrostatic pressure builds up behind a brick wall, allowing too much moisture permeance. The water is absorbed into the brick and, because of variations in temperature and pressure, the water expands. This expansion can causing flaking, cracking, or even bricks that become split entirely.

Click Here to Go to the List of All Masonry Topics

Click here to go to the list of all items on Capitol Hill Historic Masonry. 

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