Re: Questions about "green" insulation for bus
I have heard of shredded used blue jeans turned into recycled insulation. But I don't think anything currently available will insulate as well as spray foam. My justification to use spray foam would be that if I use 1/4 the energy to heat or cool a space, I am continually saving money and the planet. This would continue over the entire life of the space. I think that would be "greener" compared to using a lesser insulation and constantly pouring more energy into the space later to maintain creature comforts. The kicker to environmentalism is that man must (currently) use petro-chemicals to make the lightweight plastics and super insulations that will let him use less of them as combustion fuels.
Someone said "Making good decisions comes from experience, experience comes from bad decisions." I say there are three kinds of people: those who learn from their mistakes, those who learn from the mistakes of others, and those who never learn.