R-30 at 7.25 in. for wood 24 OC module (23 in. × 47 in.) per USA TDS (05-2025)
Key features
Semi-rigid batts with flexible long edges for cavity contact in wide bays
Noncombustible stone wool; 0/0 ASTM E84 per manufacturer TDS
Technical specifications
| R-Value | 30.0 |
|---|---|
| Thickness | 7.25 in |
| Width | 23.0 in |
| Length | 47.0 in |
| Coverage | 30.03 sq ft/pack |
| Material | Stone wool (basalt and recycled steel slag) |
| Fire rating | Noncombustible per ASTM E136; Flame Spread 0 / Smoke Developed 0 per ASTM E84 on ROCKWOOL USA Comfortbatt TDS (05-2025). |
| Sound rating | Thick stone wool improves cavity damping versus minimum fills; STC/NIC still require assembly design and perimeter seals. |
| Density | >1.8 lb/ft³ per ASTM C167 on ROCKWOOL USA Comfortbatt TDS (05-2025). |
| Framing width | 24 in. on-center wood stud module (23 in. batt width per USA TDS) |
| Construction type | Wood stud framing |
| Application area | Attic and cathedral ceilings, high-R exterior wood walls at 24 in. o.c., and exposed floors per ROCKWOOL when 7.25 in. thickness and the 23 in. × 47 in. module fit the cavity. |
Product details
Twenty-four-inch stud spacing saves lumber when the structural path allows it, but wide bays punish wrong-width batts with voids, compression folds, and thermal leakage at the face layer. ROCKWOOL publishes a 23 in. × 47 in. Comfortbatt module paired with R-30 performance at 7.25 in. labeled thickness for wood studs at 24 in. on center on the USA technical data sheet (05-2025).
This SKU (169102) packages that geometry for procurement teams who order by distributor stock numbers rather than RXCB-style callouts. Expect roughly 30.03 sq ft per bag under published YEARS data; confirm on the master label at delivery.
Stone wool’s reaction-to-fire story—ASTM E136 noncombustible and ASTM E84 0/0 indices on the Comfortbatt sheet—is a recurring specifier motivation when assemblies must avoid combustible cavity media.
Density is listed as greater than 1.8 lb/ft³ per ASTM C167 on the same TDS; STC and NIC outcomes remain assembly-dependent, so pair batts with gypsum schedules, seals, and openings your acoustic consultant models.
Seven-and-one-quarter-inch batts do not belong in 3.5 in. 2×4 cavities at full thickness; use them only where the framing depth and energy model accept the full labeled thickness.
Attach https://www.rockwool.com/siteassets/o2-rockwool/documentation/technical-data-sheets/residential/comfortbatt-exterior-wood-and-steel-stud-thermal-batt-insulation-techdata-us.pdf (05-2025 issuance) to submittals and refresh when superseded; use https://www.rockwool.com/north-america/products-and-applications/products/comfortbatt for marketing context and accessory documents.
Documents & certifications
Technical data sheet
Manufacturer-tested R-value, coverage, fire notes, and handling—use for submittals, RFIs, and field QA.
Download PDF (opens in new tab)Certifications & compliance
ASTM C665 Type I compliant, ASTM E136 noncombustible, ASTM E84 flame spread 0 / smoke developed 0 (Note 1 Class A per IBC on TDS), ASTM C518 thermal resistance per published R-thickness table, GREENGUARD Gold per ROCKWOOL Comfortbatt marketing
Frequently asked questions
Does R-30 Comfortbatt at 7.25 in. fit a standard 2×6 wall?
Does R-30 Comfortbatt at 7.25 in. fit a standard 2×6 wall?
No. 7.25 in. labeled thickness targets deeper cavities—attics, cathedral ceilings, and wood framing where the bay depth accepts the batt per ROCKWOOL. Typical 5.5 in. 2×6 stud bays need a different SKU and thickness.
How much insulation area is in each bag?
How much insulation area is in each bag?
Expect roughly 30.03 square feet per package under published YEARS data; confirm coverage on the pallet or master-pack label before takeoff sign-off.
Why does this batt measure 23 in. wide?
Why does this batt measure 23 in. wide?
ROCKWOOL assigns a 23 in. width to the wood-stud module at 24 in. on center so installers avoid chronic ripping from 15.25 in. batts stretched into wide bays.
Which technical sheet governs submittals?
Which technical sheet governs submittals?
Use the USA Comfortbatt exterior wood and steel stud thermal batt technical data sheet (05-2025 issuance) linked in this record; update if ROCKWOOL publishes a superseding issue.