Over twenty years, fiber glass installed in a single-family home saves one hundred times the energy it takes to manufacture it.

The majority of fiber glass products contain no added formaldehyde, and many are also certified by a third party program such as GREENGUARD Gold Certification or the Scientific Certifications System's (SCS) Indoor Advantage Gold Certification. Moreover, unfaced fiber glass batts and fiber glass loose fill do not contain chemical fire retardants required in other insulation types; and installing fiber glass requires no special personal safety equipment.

According to Moody "Personally and professionally the fact that there is recycled content in fiber glass is fantastic. Being conscious of renewable resources - customers appreciate that. You have to be very careful with spray foam. We are seeing more regulations. As popularity increases, so will regulations."

Ratzow adds, "fiber glass has been tested for many years and proven safe. With spray foam there are a lot of chemicals that need to be managed during the installation process. Cellulose has a product that is highly flammable, so you have to add stuff to it to take that risk away."