Kraft-faced R-13 for 2×4 walls when integrated vapor retarders are allowed
Key features
93 in. length for modular wall heights and pre-cut stud stacks
High listed package coverage (~126 sq ft) for production corridor runs
Technical specifications
| R-Value | 13.0 |
|---|---|
| Thickness | 3.5 in |
| Width | 15.0 in |
| Length | 93.0 in |
| Coverage | 125.94 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 | 15 in. width for 16 in. on-center stud spacing in nominal 2×4 walls |
| Construction type | Wood-frame and light-gauge metal-frame cavity construction |
| Application area | Wood- and metal-framed walls, floors, and roof/ceilings; interior side of basement and unvented crawlspace walls per code and Owens Corning literature. |
Product details
About 125.94 square feet per package (IDI-listed coverage). Primary use: nominal 2×4 exterior or partition walls on 16 in. on-center framing where R-13 kraft-faced cavity fill matches the prescriptive package and 93 in. batt lengths align with commercial pre-cut stud ordering.
M90 lists 3.5 in. labeled thickness, 15 in. width, and 93 in. length on IDI Insulation. Kraft facing supplies a Class I vapor-retarder layer on the appropriate side of the assembly when your hygrothermal plan uses interior kraft—orient facing per IECC, IRC, and local amendments rather than assuming one rule for every climate.
IDI markets GREENGUARD Gold certification and Next Gen handling for this listing. Field quality still requires full loft, staple flanges per manufacturer guidance, and continuous air barrier transitions at rim and penetrations because air leakage—not just R-value—drives energy and moisture risk.
Use the PINK Next Gen Fiberglas insulation product data sheet linked from IDI for tested properties and code language. When comparing to taller-wall kraft SKUs, verify length and square feet per package on the master label before locking truck counts.
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
M90 versus M92 at R-13 kraft?
M90 versus M92 at R-13 kraft?
Length and package coverage differ by SKU. M90 is distributor-listed at 15 × 93 in. with about 125.94 square feet per package; verify tall-wall SKUs separately on IDI before substituting on the same schedule.
Which way should kraft face?
Which way should kraft face?
Facing direction follows climate, assembly, and code. Follow IECC, IRC, local amendments, and your drawings—not a one-line rule from a product page alone.
How many bags should I order?
How many bags should I order?
Divide net insulated wall area by about 125.94 square feet per package and add a waste factor for openings and cuts.
Is the fiberglass core the same as kraft for fire reporting?
Is the fiberglass core the same as kraft for fire reporting?
No. Glass fiber insulation is treated as noncombustible per ASTM E136 in manufacturer documentation when unfaced; kraft facing is combustible and must be covered per code.