Premium grade all borate cellulose insulation is a specially formulated retrofit insulation to help convert poorly insulated homes into energy-efficient homes. Easy-to-install over any existing insulation. Fills gaps and voids, creating a seamless thermal blanket of protection. Preferred for wall and dense pack applications. Made of 85% recycled fibers. Offers sound control. Environmentally sustainable. Insulation flows easier during application due to a lower density of packed product. Great for drill and fill or 1-hole tube fill method wall retrofit. Does not contain Ammonium Sulfate for easier blowing machine use. Fire-resistant. 23.75 lb. bag.