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Hwara

04:35AM | 04/04/03
Member Since: 04/03/03
1 lifetime posts
Bvhvac
I live in a 35 year old brick ranch. There is no insulation in the outside walls, so we were going to do blow in insulation to help save on cost. The problem is that this past winter we had a severe cold one and our walls "weeped" and we have some kind of mildew or mold growth in some of the corners of the ceiling and wall. Should we tear the walls out and insulate and drywall so we can make sure there isn't mold in the walls? We have noticed we have been congested a lot this past year and not sure if it is related. HELP!!! Thanks

Lawrence

10:19AM | 04/12/03
Member Since: 11/14/00
333 lifetime posts
I'd say "yes," but I don't have to pay the bills for doing so. It appears you have already diagnosed the problem and just want confirmation that your diagnisis is plausible. It is.

Cold air holds less water vapor (lower humidity). As the warm, most air inside changes temperature inside your walls to the outdoor temperature, the excess moisture that the colder temperature cannot hold condenses inside your walls. You need a vapor barrier on the warm-in-winter side to prevent that from happening. The vapor barrier traps the higher-humidity in the warm air inside the room. The temperature "flows" through the barrier, but the water vapor cannot, so it can't thereafter condense inside your walls.

It is also possible to remove the mildew with bleach treatments before you spray the insulation in, but the most sure-fire way to eliminate the mold that might be in your walls is to rip out the walls, treat the studs, and install insulation with a proper vapor barrier.

See the other thread on mold for other things you can do to stop it.

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