I am doing some minor renovations to my basement with the drop ceiling and found that one of the geniuses that owned the house before me, used fibreglass ceiling tiles to seal off an old vent for a gas fireplace. Obviously this will not do. I'm thinking of building a section of 2×4's around the old exhaust and then filling it with rigid foam and spray foam. I can't take the old exhaust off the side of the house, since it is a condo and I doubt that I'm going to convince them to replace the siding where this exhaust vent is, not to mention it will probably cost me. Open to any suggestions. I would post a pic but the settings don't allow it, kinda odd.
Water – the best way to seal this old fireplace vent
insulationmoldwallswaterproofing
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Best Answer
If it's really not being used, I'd cover the vent itself in plastic from the inside wall (staple and caulk it to make it weather tight) or some other seal. Then you can just place a standard piece of fiberglass insulation with the vapor barrier (paper backing) facing inside the home. The expanding spray foam can make a big mess, and should someone want to use this vent in the future, it would be a serious pain to undo.