24 in. o.c. width without a center seam in the stud bay
Key features
R-30-class performance in a depth-limited 8.25 in. R-30C thickness
Unfaced format for project-specific vapor and smart-retarder detailing
Technical specifications
| R-Value | 30.0 |
|---|---|
| Thickness | 8.25 in |
| Width | 23.75 in |
| Length | 48.0 in |
| Coverage | 79.17 sq ft/pack |
| Material | Fiberglass (PINK Next Gen), unfaced |
| Fire rating | ASTM C665; unfaced glass fibers classified noncombustible per ASTM E136 in manufacturer documentation. Unfaced PINK Next Gen acceptable ICC types I–V per OC literature. |
| Sound rating | Fiberglass cavity fill improves typical STC versus an empty cavity; assembly STC depends on studs, layers, and openings. |
| Density | Light-density flexible batt per ASTM C665 manufacturer listings; see TDS for product-specific values. |
| Thermal conductivity | Labeled R-30C at stated thickness; see manufacturer TDS (ASTM C518) for tested conductivity. |
| Framing width | 23.75 in. width for 24 in. on-center module; verify rake, hip, and corner bays before truck counts. |
| Construction type | Wood-frame and light-gauge metal-frame cavity construction |
| Application area | Wood- and metal-framed walls, floors, roof/ceilings; interior side of basement and unvented crawlspace walls per code and OC literature. |
Product details
About 79.17 sq ft per bag (distributor-listed coverage). Primary use: nominal 2×10 or similar deep cavities on 24 in. on-center framing where the energy target is R-30-class performance but structural depth is limited—think vented cathedral ceilings, sloped ceilings over living space, and select floor systems where the model calls for R-30C rather than a full-thickness R-30 batt.
U91 packages that geometry as an unfaced PINK Next Gen Fiberglas batt: 23.75 in. width is intended to fill the common 22-1/2 in. clear span for 24 in. stud or rafter spacing without a mid-bay joint, while 8.25 in. labeled thickness is the R-30C thickness Owens Corning publishes for this depth-limited line. Unfacing keeps the designer in control of vapor retarders, smart membranes, or exterior foam strategies instead of locking the wall to kraft orientation.
Field quality still drives results: split around obstructions, maintain continuous air barrier alignment at rim and penetrations, and avoid compressing batts behind utilities because effective R-value is thickness-dependent. The product is manufactured to ASTM C665; unfaced glass fiber insulation is classified noncombustible per ASTM E136 in the manufacturer literature, and unfaced PINK Next Gen is listed for ICC construction types I through V when used as documented. GREENGUARD certification with formaldehyde-free validation plus a UL Environment EPD supports typical low-emitting and sustainability submittals.
Use the IDI-hosted technical data sheet for tested thermal values, handling weights, and code-oriented statements before inspection. California Title 24 Article 3 insulating-materials language appears in distributor documentation for this product family—confirm current amendments with your AHJ.
Commercial investigation angle: when raters compare cathedral ceiling options, they are often auditing thickness at the plate line, vent channel height above the insulation, and whether the insulation plane stays continuous with the air barrier at skylight curbs—not just the nominal R-value printed on the bag.
Solution framing: treat this R-30C unfaced batt as one layer in a hygrothermal stack that may still include smart vapor retarders, exterior foam, or conditioned-attic air sealing per your adopted IECC/IRC cycle; the batt supplies the cavity thermal component while other layers handle vapor nuance and air leakage control.
Submittal discipline: keep the distributor-listed dimensions (8.25 in. × 23.75 in. × 48.0 in.) and about 79.17 square feet per package attached to the same SKU on purchase orders, delivery tickets, and photos for QA. Authoritative tested language and code-oriented statements belong in the current manufacturer technical data sheet at https://www.idi-insulation.com/media/pdfresources/1000292_data_sheet.pdf.
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
GREENGUARD (formaldehyde-free validated), UL Environment EPD, California Title 24 Article 3 insulating materials
Frequently asked questions
Is R-30C the same R-value as standard R-30?
Is R-30C the same R-value as standard R-30?
R-30C denotes Owens Corning’s depth-limited high-R batts that meet labeled R-30-class performance at a published thickness less than a full nominal R-30 batt. Always match the SKU, thickness, and coverage on the bag label to your energy model—not a generic R-30 assumption from another width or length.
Why choose unfaced U91 instead of kraft-faced K72 with the same dimensions?
Why choose unfaced U91 instead of kraft-faced K72 with the same dimensions?
Unfaced batts remove factory kraft as a vapor-retarder layer so you can place vapor control where the hygrothermal plan requires—smart membranes, exterior foam, or climate-specific interior strategies. Kraft-faced K72 is the right tool when your assembly calls for integrated Class I vapor retarder facing on the warm-in-winter side.
How do I estimate bags for a sloped ceiling?
How do I estimate bags for a sloped ceiling?
Divide net insulated plane area by about 79.17 square feet per bag and add a waste factor for birdsmouths, dormers, skylight curbs, and odd cuts—crews often carry five to ten percent unless the drawings specify otherwise.
Will this batt work in metal studs?
Will this batt work in metal studs?
Owens Corning literature lists metal-framed cavity applications for PINK Next Gen batts, but thermal bridging and compliant liner requirements differ from wood framing. Coordinate details with your energy consultant and the current data sheet.