If you're looking for a high-quality insulation material that is also environmentally friendly, perlite should be at the top of your list. Perlite is a volcanic glass that has been heated until it pops like popcorn, creating countless air pockets that make it an excellent insulator. https://www.zupyak.com/p/3170542/t/everything-you-need-to-know-about-perlite-insulation
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