We have a second chimney that goes to the basement. It isn't connected to anything. It had a plug or cap put on in the mid-90s at the top sealing it off. Recently when someone came to inspect our working fireplace he bent up a corner of the cap on the non-working chimney. He said it was for airflow, to stop condensation that would drip into the basement. (We've never had water drip from that chimney but we did get a squirrel drop through the opening he made.) Now he wants to put a regular chimney cap on it. Is his reasoning on the up and up? No other inspector has mentioned any thingabout the unused chimney.
Capped chimney
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scivi92
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He is right that moisture could be trapped in there, and that would deteriorate the liner, adjoining chimney etc. I'd plug it down in the basement, and put a correct chimney cap on the top to allow it to breathe, but as unconditioned space, as in household air wouldn't be leaking into it.
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