Kraft-faced R-38 for coordinated vapor-retarder strategies when details allow
Key features
24 in. width for one-piece coverage across 24 in. o.c. bays
48 in. course length for common attic and lid layout planning
Technical specifications
| R-Value | 38.0 |
|---|---|
| Thickness | 12.5 in |
| Width | 24.0 in |
| Length | 48.0 in |
| Coverage | 64.0 sq ft/pack |
| Material | Fiberglass (PINK Next Gen), kraft-faced |
| Fire rating | ASTM C665 Type I; glass fibers ASTM E136 noncombustible when unfaced. Kraft facing is combustible—follow OC guidance for ICC construction types and rated assemblies. |
| Sound rating | Cavity-fill fiberglass improves typical assembly STC versus an empty cavity; final acoustic performance is assembly-dependent. |
| Density | Light-density flexible batt per ASTM C665 manufacturer listings; see TDS for product-specific values. |
| Thermal conductivity | Nominal R-value at labeled thickness; see manufacturer TDS (ASTM C518) for tested conductivity. |
| Framing width | 24 in. width for 24 in. on-center framing modules |
| Construction type | Wood-frame and light-gauge metal-frame cavity construction |
| Application area | Attics, floors, and roof/ceilings; wood- and metal-framed cavities per code and Owens Corning literature. |
Product details
About 64 square feet per package (IDI-listed coverage). Primary use: attics, floors, and ceilings on 24 in. on-center framing where kraft-faced R-38 batts match the bay width and structural depth.
E57 lists 12.5 in. thickness, 24 in. width, and 48 in. length with kraft facing on IDI Insulation. Kraft integrates a Class I vapor-retarder layer on the warm-in-winter side when your hygrothermal strategy calls for that detail—always reconcile facing orientation with IECC, IRC, and any exterior continuous insulation before rough-in sign-off.
IDI markets GREENGUARD Gold certification for this product presentation alongside Next Gen handling benefits. Field execution still hinges on staple discipline, full cavity contact, and avoiding compressed wads at eaves, chases, and skylight curbs where blower door failures hide.
Use the PINK Next Gen Fiberglas insulation product data sheet linked from IDI for fire-classification context (kraft facing is combustible), recycled content, and code references. Bag counts and logistics mirror other 64 square foot high-R packages—plan attic access and walkways before the boom truck leaves.
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 Gold certified per IDI product listing; UL Environment EPD per manufacturer family documentation; California Title 24 Article 3 insulating materials where applicable.
Frequently asked questions
Which way should kraft facing face?
Which way should kraft facing face?
Facing direction follows climate, assembly, and code. Many heating-dominated details place kraft toward the warm side in winter, but mixed and cooling-dominated rules differ—follow IECC, IRC, and your drawings.
Is kraft facing an air barrier?
Is kraft facing an air barrier?
No. Kraft is primarily a vapor retarder and handling layer. Maintain a designed air barrier at the appropriate plane with sealed transitions.
E57 versus unfaced W65 at similar dimensions?
E57 versus unfaced W65 at similar dimensions?
Both are distributor-listed at 12.5 x 24 x 48 in. with about 64 square feet per bag per IDI. E57 adds kraft facing for integrated vapor-retarder workflows; W65 is unfaced for separate vapor detailing.
Can kraft-faced batts be left exposed in living space?
Can kraft-faced batts be left exposed in living space?
No. Kraft facing is combustible; cover with code-approved thermal barriers and follow occupancy separation requirements.