R-21 Thermafiber Fire & Sound Guard Plus Mineral Wool Batts (5.5 x 16 x 48, 24 Packs)

Owens Corning Thermafiber Fire & Sound Guard Plus mineral wool batts deliver R-21 thermal performance with exceptional sound control and fire resistance for residential and light commercial builds. Sized for 16 in on-center framing, these 5.5 in thick batts fit snugly in wall cavities for fast, precise installation.

Key Features:

• Thermal + Acoustic Performance: R-21 insulation with excellent sound absorption for quieter interiors.
• Noncombustible Mineral Wool: Resists fire, moisture, and mold; non-corrosive and non-deteriorating.
• Easy Fit Installation: Flexible batts cut cleanly with a serrated knife and expand for a snug fit.
• Versatile Applications: Ideal for interior/exterior walls, ceilings, basements, and crawl spaces.
• Code-Compliant: Class A interior finish; ASTM C665 Type 1 compliant.

Please check the Product Data Sheet Here

Specifications Table:

Frequently Asked Questions (FAQ):

Q: What framing is this size intended for?
A: The 5.5 in x 16 in x 48 in batts are designed for 2x6 walls with 16 in on-center studs.

Q: How many batts per bag and coverage?
A: Each bag contains 6 batts; coverage for the 16 in x 48 in size is approximately 32 sq ft per bag.

Q: Is it safe near heat sources?
A: Yes, the mineral wool is noncombustible and provides fire resistance; always follow local codes and manufacturer clearances.

Q: Can I cut the batts to fit around obstacles?
A: Yes. Measure and cut with a serrated knife, squeeze to insert, then release to expand for a snug fit.

Q: Where can it be used?
A: Use in interior and exterior walls, ceilings, basement walls, and crawl spaces.

Quiet Strength for Expressive Walls

This mineral wool elevates the envelope with a calm, confident presence—delivering warmth and hush in one refined gesture. I love the dense, tailored profile that slips neatly into a 2x6 cavity, creating a serene backdrop for layered textures and bold art. Pair it with plaster-finish walls and pale oak to let acoustics breathe luxuriously. It’s a discreet essential that anchors a home in comfort and quiet glamour.

Create a quieter, safer, more energy‑efficient space—add Thermafiber Fire & Sound Guard Plus to your cart today.