I have it blown in the walls of my house, I had what the contractor called a flash coat on top of the ceiling in attic then blown fiberglass on top of that. All open cell. So you could say the living area is encapsulated. At the time the air conditioner manufacturer was offering a special on buying a complete (AC/filter/fresh air) system. At the time (5 years back), the technique we used in the attic was un-tested. The attic is vented and not sealed like as if I would have sprayed it on the bottom of the roof and sealed the eves. Additionally I made sure that all windows, base plates etc were sealed as best as practical. Moisture can be an issue in my house. I have one A/C unit for a 3100 sq ft house and I have to force it to run to get the moisture out. It is one of the units that monitors moisture and has settings to help manage it and I have to set it at its maximum to keep moisture below 60% during the spring and fall (mild temps). The house is like a cooler as someone else has mentioned. Whoever said the blown stuff in the attic moves is spot on. My electricity bill is low, very low considering. My brother in law actually had his roof rafters blown and sealed eaves with foam (encapsulated his attic), the guys sealed the walls around penetrations with foam then blew some sort of fiberglass or wool in the walls. He has a similar size house and just slightly higher electricity bills yet not the moisture issues. The guys who installed the AC were the same guys who suggested and installed the insulation. He paid less than I did, his AC unit and anything else he has in the attic is semi conditioned which lowered the cost ac ducts etc as he installed the minimum insulation on those as the attic area is semi conditioned. There was about a three year difference in the building of our houses and seems like he got a better system. He paid less, his ac unit, water heater, whatever is in the attic will see less heat damage, he doesn't have moisture issues and his electricity bills are about the same. Bottom line is that foam is an awesome product, yet application needs to be thought out.
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