Unfaced mineral wool sound & fire batt insulation (24 in. x 48 in.)

Johns Manville MinWool SAFB mineral wool batts are designed to improve sound control in wall and ceiling cavities while adding robust fire resistance. These unfaced 24 in. x 48 in. batts fit 24-in on-center framing and cover 80 sq ft per bag for fast, clean installation.

Key Features:

Sound Control: Helps reduce noise transfer through interior partitions and wall/ceiling assemblies (improves STC ratings by up to 10 dB).
Fire Resistance: Mineral wool with melting point in excess of 2000F; flame spread 0 and smoke developed 0.
Unfaced Design: No vapor retarderideal for interior partitions or adding to existing assemblies where a facer isnt desired.
Durable Inorganic Material: Resists fungi growth and does not sustain vermin.
Easy Fit Batts: Pre-cut batts sized for 24-in on-center stud cavities and simple cutting/installation.

Please check the Product Data Sheet Here

Specifications Table:

Specification	Details
Product Line	MinWool SAFB (Sound Attenuation Fire Batts)
Insulation Type	Batt insulation
Material	Mineral wool
R-Value	R-3.7
Facing	Unfaced
Width	24 in
Length	48 in
Thickness	3 in
Coverage Area	80 sq ft per bag
Pieces per Package	10 pieces per bag
Multi-Pack Quantity	4 bags (multi-pack)
Sound Control	Absorbs sound; improves wall assembly STC ratings by up to 10 dB
Fire Resistance	Melting point in excess of 2000F (1093C); Flame Spread 0; Smoke Developed 0
Durability	Inorganicno growth of fungi; does not sustain vermin
Recommended Applications	Metal-stud wall cavities of interior partitions and exterior walls; above suspended ceiling systems
Framing Compatibility	For 2×4 steel-framed walls; 24-in on-center stud spacing
Vapor Retardant	No
Bag Dimensions (L x W x D)	24 x 18 x 48
Package Type	Multi-pack
Package Weight	39.6 lb
Sound Barrier	Yes
ENERGY STAR Certified	Yes
Fits 2 x 4 Walls	Yes
Fits 2 x 6 Walls	No
CA Prop 65 Warning	Yes
Warranty	None
For Use in Walls	Yes
For Use in Ceilings	Yes
For Use in Floors	Yes
For Use in Crawlspaces	Yes
For Use in Attics	No
For Use in Basements	No
UNSPSC	11162400

Frequently Asked Questions (FAQ):

Q: What framing is this insulation sized for?
A: Its sized for 24-inch on-center cavities and is commonly specified for 2×4 steel-stud wall assemblies.

Q: Is it faced or unfaced, and do I need a vapor retarder?
A: It is unfaced (no built-in vapor retarder). Whether you need a separate vapor retarder depends on your wall assembly and local building code.

Q: Where can I use these batts?
A: Theyre intended for sound attenuation and fire resistance in wall cavities and can also be used above suspended ceiling systems.

Q: How much area does one bag cover?
A: One bag covers 80 sq ft.

Q: What are the batt dimensions?
A: Each batt is 24 in. wide x 48 in. long x 3 in. thick.

Quiet luxury, built into the walls

Theres a certain kind of luxury you cant seeonly feel: the hush of a room that holds its calm. These unfaced mineral wool batts slip behind the surfaces to soften sound and add serious fire resistance, creating a sanctuary that performs as beautifully as it lives. Pair them with a layered wall finishtextural plaster, tailored millwork, or a gallery-ready paint sheenfor spaces that feel composed and quietly powerful. Its the invisible upgrade that makes a home feel truly elevated.

Upgrade your walls and ceilings with Johns Manville MinWool SAFB batts to add quieter comfort and fire-resistant peace of mind.

Warranty

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