attic mildew and insulation


Old 01-10-01, 05:30 AM
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I have a 100 year old farmhouse. When purchased 2.5 yrs ago, the attic was not well ventilated (sloped roof, not flat). There was much mold/mildew on the existing attic interiors opposite the roof. Note that the roof and shingles seem ok as new plywood was added when shingles were replaced about 5 yrs ago. No mildew on plywood,or attic floor rafters, only on original roof boards. Added ventilation 2 years ago. There was also loose fill cellulose as insulation between floor rafters, all exposed. The mildew stains still remain on the original roof boards two years later.
Question 1: Should I do something about the mildew stains, and what should I do?
Question 2: I would like to add, or substitute newer insulation (like mirafil) in the attic. Should I be concerned about the pre-existing cellulose loose fill insulation since it was exposed to the poor ventilation (i.e. high humidity) and mildew/mold? Should it be removed? I do not notice any mildew or mold on the loose fill. Thanks!

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Old 01-12-01, 04:26 AM
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The mildew stains may still be there, but not the mildew. If you want to be sure, you can was the stains with apple cidar white vinagar. This will kill the mildew for sure. It will not hurt the loose insulation. Just leave it there and put your new insulation over it. Good Luck
Old 01-12-01, 04:53 AM
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Thanks Jack. You da man!

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