FIBERLITE R-PLUS STABILIZED Cellulose is a fire-retardant wood fiber cellulose insulation designed for use in wall cavities and attic applications where dependable coverage and long-term stability matter. FIBERLITE R-PLUS STABILIZED Cellulose is a practical solution for contractors and builders looking for cellulose insulation that supports efficient installation, reliable performance, and consistent results across residential and light commercial projects.