The damp feeling is probably because of the cooler temp. WHen you lower the temp you raise the relative humidity. I would cut some test holes in the garage ceiling to see how well it is insulated. If you insulate put the paper side up just like in a crawl space. I'm not sure I'd do a vapor barrier given that you have wall board on the outside but others may have different opinions. You might also see if you can add another vent run from your heater. If you have a unit in the attic it is pretty easy to add a 6" flex line and vent.
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20 years ago