Just a little thing to remember...depending on where the vapour barrier is in your walls and what kind of construction your house is made of, you can't always just toss more insulation on your walls. And of course this note is for exterior walls and it's definitely an issue in colder climates. I know the National Building Code of Canada lays out some rules so that your house doesn't become mold infested, I dont know about American Codes at all.

Just thought I'd put my two cents in so maybe someone wont have huge issues down the road.

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