Chimney crowns seal off the air space between the outer walls of the masonry chimney and the flue liner and prevents water entry into the stack. Cracks in the crowns of masonry chimneys allow water from rain and snow to enter the masonry where it can freeze and cause further damage to the surrounding masonry and over time erode away the brick and mortar. Eventually, if it goes unnoticed long enough, you have a chimney that has lost its structural integrity and will need to be rebuilt.
Because of their location on a house, chimneys tend to be one of those out of sight, out of mind items. It's recommended to routinely have a specialist inspect your chimney interior and exterior to determine if there is any need for repairs.
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