As much as 40% of fiber glass insulation is manufactured with recycled glass, and the base material is sand, which is a rapidly renewable resource that is widely available, NAIMA says.
Slag wool insulation is manufactured from blast furnace slag, which is a byproduct of steel manufacturing. The secondary material ends up in landfills if it is not recycled in manufacturing.
NAIMA says that manufacturing fiber glass and slag wool insulation is an energy-intensive process, but the products will save more than 12 times the amount of energy used to produce them in their first year of use alone.
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