Rockwool Stone Wool AFB 3 in. x 16 in. x 48 in. Industrial Board Insulation, Gray, Sold by the Bag

Rockwool Stone Wool AFB is a gray stone wool board for structural fire protection applications, sold by the bag. This item measures 3 in. thick x 16 in. wide x 48 in. long and delivers 85.325 sq. ft. of coverage per bag. It is used where dense, fire-resistant stone wool insulation is specified.

Key Features:

• Stone wool board: The board is made of stone wool, a dense mineral insulation material.
• Fire protection category: The product is classified under structural fire protection insulation.
• 3 in. thickness: Boards are 3 inches thick for assemblies that call for that depth.
• Board dimensions: Each board measures 3 in. x 16 in. x 48 in.
• 85.3 sq. ft. per bag: One bag provides 85.325 sq. ft. of board coverage.
• Gray stone wool: The insulation is gray in color as listed in the product specification.

Specifications Table:

Coverage & How Much You Need:

One bag covers 85.325 sq. ft. of area with 3 in. x 16 in. x 48 in. boards. Divide your assembly’s square footage by 85.325 to determine the number of bags, and plan cuts around penetrations with a small waste allowance.

Fit and Compatibility:

Stone Wool AFB boards are cut to fit within assemblies requiring structural fire protection insulation, such as shafts, rated partitions, and industrial applications. Attachment systems, fasteners, and any required firestop accessories are specified separately in the governing assembly design.

Frequently Asked Questions (FAQ):

Q: What size are the boards?
A: Each board is 3 in. thick, 16 in. wide, and 48 in. long.

Q: How much does one bag cover?
A: A bag provides 85.325 sq. ft. of board coverage.

Q: What is AFB made of?
A: It is stone wool, a mineral fiber insulation manufactured by ROCKWOOL.

Q: What is it used for?
A: It is categorized as structural fire protection insulation, used where dense stone wool board is specified.

Q: What color is it?
A: The board is gray.

Q: Are fasteners or attachment systems included?
A: No, the bag contains the insulation board only; attachment is per the project’s specified assembly.

Expert Verdict Reviewed by the SuperArbor Pro Desk

Stone wool AFB is chosen when a dense, dimensionally stable board is required for fire protection assemblies; verify the specific board thickness against your listed or tested assembly before ordering. Boards cut cleanly with a serrated knife and friction-fit snugly without compression. Order by total square footage divided by the 85.325 sq. ft. bag coverage, adding waste for cuts and penetrations.

Cut stone wool with a serrated knife and wear gloves, long sleeves, and a dust mask, since mineral fibers can irritate skin and airways.

Order Rockwool Stone Wool AFB 3 in. board by the bag for your fire protection insulation scope.