R-15 performance in a 3.5 in. cavity for code-tight 2x4 walls on 24 in. o.c.
Key features
Unfaced configuration preserves designer-controlled vapor and air barrier sequencing
Next Gen fiber technology for stiffness, recovery, and cleaner cuts on production sites
Technical specifications
| R-Value | 15.0 |
|---|---|
| Thickness | 3.5 in |
| Width | 24.0 in |
| Length | 96.0 in |
| Coverage | 112.0 sq ft/pack |
| Material | Fiberglass (Owens Corning PINK Next Gen™ Fiberglas®, unfaced) |
| Fire rating | ASTM C665 Type I; glass (unfaced) classified noncombustible per ASTM E136. Coordinate rated assemblies with your AHJ when combining with facings, membranes, or foam. |
| Sound rating | Unfaced cavity-fill fiberglass improves typical assembly acoustics versus an empty cavity; field STC depends on framing, openings, and flanking paths. |
| Density | Higher-density R-15-in-2x4 formulation; supplier part 344978 per Owens Corning / distributor listings |
| Thermal conductivity | Nominal R-value at full labeled thickness; see manufacturer TDS for tested thermal values. |
| Framing width | 24 in. width for nominal 24 in. on-center 2x4 high-R wall strategies |
| Construction type | Wood-frame and light-gauge metal-frame cavity construction |
| Application area | High-R 2×4 wood or metal walls on 24 in. o.c.; other cavities accepting 24x96 unfaced batts per plans; pair with continuous insulation or interior smart membranes when required |
Product details
Energy codes in many jurisdictions no longer let bare R-11 or R-13 suffice for above-grade wood walls, yet structural packages still ship nominal 2×4 studs. A92 is how Owens Corning packages R-15-class performance into that same 3-1/2 in. cavity depth using a 24 in. wide, 96 in. long unfaced batt so wide-module framing sees fewer mid-bay gaps than resizing narrower batts.
Because the product is unfaced, you retain flexibility for smart vapor retarders, exterior continuous insulation, and fluid-applied air barriers without fighting integral kraft. The compliance stack is the familiar PINK Next Gen bundle: ASTM C665 manufacturing, ASTM E136 noncombustibility for unfaced glass, Title 24 Article 3 language for California-bound jobs, GREENGUARD validation, and EPD data for embodied carbon worksheets.
Packages cover roughly 112 square feet (IDI listing), so truck math and staging pallets differ from commodity R-13 bags—communicate the higher density to crews so they do not assume identical roll weights. Installation discipline still matters: split around utilities without crushing, maintain loft at top plates, and document thickness for raters when projects chase tight blower-door targets.
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 Certified (formaldehyde-free validated), UL Environment EPD, California Title 24 Article 3 insulating materials, ENERGY STAR® certified per manufacturer listings
Frequently asked questions
When should I pick A92 instead of R-13 batts in a 2x4 wall?
When should I pick A92 instead of R-13 batts in a 2x4 wall?
Choose A92 when your prescriptive table or modeled performance path requires more cavity R-value than R-13 but you cannot deepen to 2x6.
Does higher density mean I can compress it to fit a 2x3 chase?
Does higher density mean I can compress it to fit a 2x3 chase?
No. Labeled R-value assumes full thickness; compressing any batt lowers thermal performance and can void assembly assumptions.
How many square feet per bag for estimating?
How many square feet per bag for estimating?
IDI distributor listings show 112 square feet per package; add field waste for openings and odd bays.
What paperwork supports code inspections?
What paperwork supports code inspections?
Use the current manufacturer data sheet, product labels, and photos documenting full loft and installation quality.