ROCKWOOL AFB® RW150SAFB24 1.5 in. x 24 in. x 48 in. Insulation 128 SQF

Commercial interiors often need both acoustic comfort and fire-safe cavity fill in a single trade-friendly package. ROCKWOOL AFB® is positioned exactly there: a semi-rigid stone wool batt for interior partition walls and interior floor/ceiling constructions where sound absorption and noncombustible reaction to fire matter as much as install speed.

This SKU packages a 1.5 in. thick batt at 24 in. width and 48 in. length with roughly 128 square feet per bag on the IDI product listing—always reconcile coverage against your field takeoff and the master-pack label before locking in truck counts. The 24 in. dimension aligns with ROCKWOOL’s stated steel-stud sizing class in the USA AFB technical data sheet, which helps crews maintain full-width contact in common commercial stud modules without inventing odd joint patterns mid-wall.

On the fire side, manufacturer documentation emphasizes noncombustibility (ASTM E136 / CAN/ULC S114 family of statements on the data sheet) and the lowest class of flame spread and smoke developed indices in the ASTM E84 table printed on the TDS—language that supports high-performance interior specifications when the assembly details are correct. AFB is also described as a component in third-party fire-rated partition designs; your submittal package should still cite the tested assembly, not the loose batt alone.

Acoustically, the current ROCKWOOL USA AFB data sheet (issued 11-2025) publishes third-octave absorption and NRC/SAA values for nominal 1, 2, 3, 4, and 6 in. thicknesses; it does not print a row for 1.5 in. IDI’s specification block for supplier part 168672 lists NRC 0.85 at 1.5 in.—treat that as distributor-published product data and confirm on any job-specific submittal refresh. Real-world STC still depends on the full partition: gypsum layers, resilient channels, seals at perimeters, and penetration treatments.

Durability and handling follow the broader AFB story: inorganic fibers that do not feed mold, water repellency per manufacturer claims, and a balance of rigidity and flexibility so batts recover after compression packaging. Cut with a serrated knife, friction-fit without chronic voids, and keep the cavity aligned with your air barrier and MEP coordination.

Authoritative compliance language, maximum air velocity (1000 fpm per UL 181 on the TDS), and updated certification references belong in the current ROCKWOOL PDF at https://p-cdn.rockwool.com/syssiteassets/o2-rockwool/documentation/technical-data-sheets/commercial/afb-acoustical-fire-batts-techdata.pdf plus the AFB product hub at https://p-cdn.rockwool.com/north-america/products-and-applications/products/afb.