Batt insulation made 50 percent of recycled plastic bottles (the other half is virgin polyester) means no glass fibers to cause skin irritation and no need for you to wear a mask during installation. It looks as easy to handle as a foam pillow and won't sag over time. The R-value is 4 per inch for an R-13 batt, which costs 72 cents per square foot. They also make R-15, R-19, and R-21 batts. EnGuard GlassFree Insulation Technology, by Vita Nonwovens
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