“Our cellulose insulation runs about 84 cents per square foot,” says Harrah. “If I had a choice between fiberglass, foam, and cellulose, I would go with cellulose.” A wet-spray cellulose ...

Cons: It has a modest R-value and is more permeable to air than, say, spray foam insulation, so effective sealing before insulation is critical. While the fiberglass particles in some new products ...