Greenfiber. Premium Grade Retrofit cellulose blown-in wall and attic insulation features an all-borate, fire-resistant formula. The new formulation also provides a higher level of dust suppressant, the firm says, and is easy to install over any existing insulation. It provides an installed R-value of 13 at 4.1 inches, 19 at 6.1 inches, and 30 at 9.4 inches. The product is SCS-certified for 85% recycled content and carries Energy Star certification. 800.228.0024. www.greenfiber.com.