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I noticed all my air return vents on outside walls have this gap, and it pulls some air from the outside. I'm thinking I would like to seal these gaps up with an expanding foam or something. Is there any reason I shouldn't do that?

I recently discovered that I have moisture in my walls, and I think it might be coming though the aluminum siding, but I can't figure out where. Here is a picture showing where the moisture was found on the interior. It was picked up with a moisture meter. And here's a close up of the...

I recently bought a house with a small mold problem in the attic. I was told it was the result of improper ventilation, and once I fixed that the mold would basically go dormant - or I could choose to have it cleaned. The mold is on the underside of the roof, and is not very severe. However...