We've got an old chimney in our kitchen. The bottom has been removed, and the stack is held up on an RSJ. It's lined with what look like ceramic drain pipes. At the top used to be a cowl, but as it looked horrible (and doubtless sucked lots of heat out) I replaced it with a cap which has a much smaller opening. At the bottom is a hit-and-miss grill. We've tried the grill both open and shut - and we're suffering from condensation dripping down onto the worktop beneath. It's much worse without the cowl :(
It's worse after rain. This may just be due to higher humidity, or it could be soaking in - the pointing isn't wonderful.
What should we do?
Andy