Fiberglass is another type of insulation material, but it’s made mostly from sand and glass. It’s fabricated via a manufacturing process similar to mineral wool. But, towards the end of its production, a polymer glue is sprayed onto it, which gives the fiberglass its classic pink, cotton-candy look.
Fiberglass is commonly chosen for insulation because of its:
Easy installation (if no electrical boxes or other objects are between studs and joists)
Fire resistance
Cost effectiveness
Light weight
Wide availability
Recycled sources
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