My chimney looks pretty good ( from the ground) at roof level and was pointed up a few years ago. The base looks fine. However there are three floors, two of which are enclosed except for a small fireplace on the main floor. Here's the thing. When I went to the attic recently I noticed that the bricks there were getting crumbly; the surface could be brushed away. This is scary, given the three floors below it and a roof above. Is there a way to brush off what I can and cover it with some sort of surfacing, like a stucco or something? And should I be worried about what's happening between floors?
Oh, yeah. The fireplace is used, but not often, and has been cleaned, though not recently. Probably due. Also the flue for the oil furnace also passes through a flue in the same chimney.