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I blew insulation into the interior walls surrounding the master bedroom. The walls are textured drywall which was difficult for me to match - paint helped. It was very messy. The air going in needed a place to escape and came back out into my face. I also overfilled a couple of walls and had to add a few more drywall nails. If your walls have NO insulation, this will be worth it, otherwise, it is a hassle. Wear goggles and wear a respirator. Buy or borrow some cheap walkie talkies to communicate with the person running the hopper. Don't expect them to understand you through the respirator. Tell the other person that if you key the mic two or more times it means: "SHUT IT OFF!!!". Blowing insulation into the attic on the other hand was relatively easy.
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