Knauf KN3646 Blow-in Fiberglass Insulation Bag

Product Description

The KNAUF KN3646 is a blow-in fiberglass insulation product designed for both weatherization retrofits and new construction applications. Sold by the bag, it delivers consistent thermal resistance by resisting outdoor air infiltration and helping maintain stable indoor temperatures. Made with recycled glass fiber, it carries GreenGuard Gold Certification and has been validated as Formaldehyde-Free. The KN3646 is approved for use in BIBS (Blow-In-Blanket System) installations, making it a technically verified option for contractors working with pneumatic insulation equipment. Each bag weighs 32 pounds.

This insulation is suited for open attics in new and existing residential or commercial structures, closed cavities behind fabric or netting, and any application where pneumatically installed insulation is the most practical and cost-effective solution. It is especially well-suited for retrofit projects where existing building envelopes need improved air and thermal performance without full demolition of finished assemblies.

Key Features

• BIBS (Blow-In-Blanket System) approved for pneumatic installation compatibility
• GreenGuard Gold Certified for low chemical emissions in indoor environments
• Validated Formaldehyde-Free by UL Environment
• EUCEB Certified fiberglass composition
• Made with recycled glass fiber content
• Suitable for open attics, closed wall cavities, and retrofit applications

Compatibility

Approved for use in BIBS (Blow-In-Blanket System) installations. Suitable for open attics in new and existing structures, closed cavities behind fabric or netting, and applications where pneumatically installed insulation is most cost-effective.

Installation Notes

Installation is performed by insulation contractors using pneumatic blowing equipment calibrated to the manufacturer's coverage chart for the required R-value. In closed cavity applications, fabric or netting must be properly secured before blowing to contain the material and achieve uniform density. Follow all applicable building energy codes, including IECC requirements for insulation levels by climate zone. Wear appropriate respiratory protection and eye protection when handling loose-fill fiberglass.