R-21 Unfaced Mineral Wool Batt Insulation (15 in x 47 in)

THERMAFIBER® Fire & Sound Guard® Plus mineral wool batts deliver R-21 thermal performance with added sound absorption and non-combustible fire resistance. Designed for wood-stud construction, the unfaced 15 in x 47 in batts fit common cavities in walls, floors, ceilings, basements, and crawl spaces while resisting moisture and mold.

Key Features:

• Fire-Resistant Mineral Wool: Non-combustible batt insulation designed to help improve fire performance in residential and light commercial assemblies.
• Sound & Noise Control: Mineral wool structure provides exceptional sound absorption for quieter interior spaces.
• Moisture & Mold Resistance: Resists moisture and mold to support long-term performance in challenging areas like basements and crawl spaces.
• Easy Friction-Fit Installation: Unfaced batts are easy to cut and fit in standard wood-stud cavities.
• Versatile Applications: Suitable for interior/exterior walls, floors, and ceilings in wood-stud frame construction.

Please check the Product Data Sheet Here

Specifications Table:

Frequently Asked Questions (FAQ):

Q: Is this batt faced or unfaced?
A: It is unfaced mineral wool batt insulation.

Q: Where can this insulation be installed?
A: It’s listed for basement, ceiling, floor, and wall installations, including interior and exterior wall applications.

Q: What is the R-value and thickness?
A: It is R-21 and 5-1/2 in thick.

Q: What size cavities does it fit?
A: The batts are 15 in wide x 47 in long for typical wood-stud framing applications.

Q: What does it resist?
A: It resists fire, fungi, moisture, and mold.

Quiet Luxury, Built Into the Walls

True luxury is as much about what you don’t hear as what you do. These THERMAFIBER® Fire & Sound Guard® Plus mineral wool batts slip behind the scenes to elevate comfort—layering R-21 warmth with a hush of sound absorption and the confidence of non-combustible performance. Use them to refine bedrooms, media rooms, and shared walls where serenity matters most. It’s the kind of invisible upgrade that makes a home feel effortlessly elevated.

Upgrade your walls with THERMAFIBER® R-21 mineral wool batts for comfort, quiet, and fire-resistant performance in one easy-to-fit insulation.

Warranty

Installation