First off - I believe the roofers have finally fixed the leak that was from the flashing around the chimney. Info: House 1953; wood burning fire place; chimney rebuilt from roof up; fireplace not in use but does work. I have a fireplace/chimney that is on a west facing exterior wall. 3 of the 4 chimney walls are on the exterior. Water damaged the ceiling and the wall. What is the proper way to repair the wall? Is there special drywall that should be used when covering a chimney stack?