Knauf Ecobatt R-21 unfaced fiberglass insulation batts deliver reliable thermal performance and year-round comfort for homes. Designed for easy installation by pros and DIYers alike, it’s the practical choice when you want value without sacrificing performance.

Note: If you require delivery to ID, MT, OR or WA, please select that delivery zone as pricing and delivery to those states may vary.

Key Features & Design

• Size & packaging: 5.5 x 16 x 96 inches; Master Pack of 4.
• R-Value: R-21 for strong thermal resistance.
• Materials & sustainability: GREENGUARD gold certified to be formaldehyde free; Naturally brown, eco-friendly binder made from corn, sand, and recycled glass (no added dyes); Soft to the touch, easy to cut, and less itchy.
• Post-consumer recycled content: Third-party certified to include a minimum of 50% post-consumer recycled content.
• Performance & comfort: Reduces sound transmission and helps lower heating/cooling costs (up to 15% savings); year-round comfort and easy installation.
• Unfaced design: Unfaced fiberglass insulation suitable for a variety of installation scenarios.

The easiest way to get more energy savings is to install more insulation. Knauf Ecobatt R-21 makes it straightforward to upgrade any space, delivering dependable performance without the hassle.