I know this sounds a little crazy, but how about used packing peanuts? And ground up stryrafoam? I seem to end up with more peanuts than I can use from packages recieved or packages recieved at work. They are free. Many products today are also shipped with foam-especially electronic producs. Coudn't this stuff be ground up and blown in for insulation? It should last a very long time and have good insulation properties. Someone would have to do some tests to determine Rvalue though and how thick a wall cavity you would need to get the proper R value. Like I said I come across this stuff all the time and they use it for coolers etc. Sure application might be a little messy or alittle more cleanup in the house, but jeez, it could be free other than the work to collect it. You could also advertise in your town that you recycle this stuff and get people to drop it off to you, no? It's a solution to keep it out of the landfill.
