One thing that brick chimneys, stone chimneys and fireplaces have in common is that eventually most will require some type of maintenance to keep a water tight seal. Leaks into a chimney can cause unsafe heating equipment as well as costly damage to the chimney, the appliances connected to it, and to the building itself. Is your chimney leaking? Are you experiencing water marks on the ceiling or walls near your chimney? Is there water appearing in the firebox? Similarly, are you experiencing cracks on the exterior of the chimney which seem to keep getting bigger or are bricks actually flaking off from your chimney? Water is the common thread between all of these problems (for the most part) and following this checklist should help you to be able to arrest water infiltration or prevent further damage.