19.25 in. width tracks 24 in. o.c. joist spacing for attic floors and flat ceilings
Key features
48 in. length improves handling in tight attic kneewalls and shallow truss bays
Kraft facing plus Next Gen recovery for consistent thermal thickness
Technical specifications
| R-Value | 19.0 |
|---|---|
| Thickness | 6.5 in |
| Width | 19.25 in |
| Length | 48.0 in |
| Coverage | 67.0 sq ft/pack |
| Material | Fiberglass (PINK Next Gen) with kraft vapor-retarder facing |
| Fire rating | ASTM C665 Type I; glass fibers ASTM E136 noncombustible when unfaced. Kraft facing is combustible—install per OC facing exposure rules. |
| Sound rating | Cavity-fill fiberglass improves typical floor/ceiling STC versus an empty cavity; assembly details dominate performance. |
| Density | Light-density flexible batt per ASTM C665 manufacturer Type I listings |
| Thermal conductivity | Nominal R-19 at full labeled thickness; see manufacturer TDS for tested values |
| Framing width | 19.25 in. width for nominal 24 in. on-center joist or stud bays |
| Construction type | Wood-frame and light-gauge metal-frame cavity construction |
| Application area | Wood-framed floors and roof/ceilings; compatible wall cavities; interior side of basement and unvented crawlspace walls where approved by code |
Product details
About 67 square feet per package (IDI-listed coverage for F85). Primary use: wood-framed floors and roof/ceilings on 24 in. on-center joists where 19.25 in. is the correct insulation width to mirror joist spacing without side gaps, plus compatible wall cavities that share that module.
The shorter 48 in. length is deliberate for attic floor grids, platform framing, and any layout where you want manageable pieces on staging planks or knee walls. Crews still have to mind compression at mechanical chases, keep baffles vent channels clear in vented roofs, and treat kraft as part of the vapor-control story—not a substitute for an air barrier at the plane you tested.
Owens Corning’s published compliance stack for PINK Next Gen includes ASTM C665 manufacturing, California Title 24 Article 3 alignment, GREENGUARD certification with formaldehyde-free validation, and a UL Environment EPD. Kraft-faced insulation is acceptable for ICC construction types III–V when detailed per manufacturer guidance.
For estimating, use the distributor’s 67 sq ft number as the planning baseline, then confirm the printed bag label. The F85 technical data sheet documents product properties, fire-surface characteristics context, and installation references you can drop directly into submittals.
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, ASTM C665
Frequently asked questions
Why 19.25 in. width instead of 24 in.?
Why 19.25 in. width instead of 24 in.?
Nineteen-and-a-quarter-inch batts are catalogued to fit the clear width between 24 in. on-center joists or studs after you account for nominal lumber dimensions. F85 pairs that width with a 48 in. length for floor and ceiling grids.
Is 67 sq ft the right number for takeoffs?
Is 67 sq ft the right number for takeoffs?
IDI lists 67 square feet per package for F85. Always verify the coverage statement on the physical bag and the manufacturer data sheet before you convert packages to square footage on a contract.
Can I double these in an attic?
Can I double these in an attic?
Layering insulation changes effective R-value, compression, and sometimes fire or ventilation requirements. Follow the assembly detail approved by your designer or code official rather than improvising stacks.
What documents support LEED or low-emitting claims?
What documents support LEED or low-emitting claims?
Owens Corning publishes GREENGUARD and UL Environment EPD references in the PINK Next Gen data sheet bundle. Use those primary documents for LEED EQ credit narratives and submittals.