Cozy Home Attic Insulators When considering insulation for your home, it’s important to understand the facts about different product types and options. First things first: there is no such thing as a “best insulator.” Surprised? According to the Building Sciences Corporation (BSC), all insulation types perform equally well when properly installed and air sealed. Insulation Materials: Fiberglass Insulation Mineral wool Insulation Cellulose Insulation Spray foam Insulation Tips for choosing a Insulation Materials: Fiberglass insulation — Contains 40-60% recycled content, depending on manufacturer and facility. Slag wool and rock wool (the two types of mineral wool insulation)—contain 10-15% and 70-90% recycled content respectively. Cellulose insulation —Has significant recycled content, with manufacturers often claiming 80% or more. Spray foam insulation —Is strictly a chemical product and therefore contains very little recycled content.