24 in. wide R-19 batt eliminates mid-bay joints on 24 in. o.c. 2×6 framing
Key features
96 in. length pairs with eight-foot wall modules and common staging workflows
Kraft facing plus Next Gen handling characteristics for production-paced installs
Technical specifications
| R-Value | 19.0 |
|---|---|
| Thickness | 6.5 in |
| Width | 24.0 in |
| Length | 96.0 in |
| Coverage | 128.0 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 wall STC versus an empty cavity; final acoustic performance is assembly-dependent. |
| 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 | Sized for nominal 2×6 cavities on 24 in. on-center stud spacing (24 in. wide batt) |
| Construction type | Wood-frame and light-gauge metal-frame cavity construction |
| Application area | Wood-framed walls, floors, and roof/ceilings; metal-framed walls and floors; interior side of basement and unvented crawlspace walls where approved by code |
Product details
About 128 square feet per package (IDI-listed coverage for M51). Primary use: exterior or interior 2×6 walls, floors, and roof/ceilings on 24 in. on-center framing where a single 24 in. wide batt should fill the bay without a center seam.
Twenty-four-inch modules are common in production housing and light commercial shells because they save lumber and speed layout—but insulation has to widen with the stud line. M51’s 24 in. width and 96 in. length match the eight-foot module many crews optimize around for lifts, scaffolding, and panel lines, while the labeled 6.5 in. thickness targets R-19 performance in nominal 2×6 depth when the cavity is true.
As with every kraft-faced PINK Next Gen SKU, Owens Corning documents ASTM C665 production, California Title 24 Article 3 alignment, GREENGUARD certification with formaldehyde-free validation, and a UL Environment EPD. Kraft-faced goods are listed for ICC construction types III–V when used as prescribed.
Quality control on site is still about gentle fit: avoid stuffing that crushes labeled thickness, treat penetrations and intersecting walls as air-barrier work, and staple or support facing only per the installation guide. Download the M51 technical data sheet for prescriptive references, coverage tables, and fastening guidance tied to this item.
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 pick a 24 in. wide R-19 batt?
Why pick a 24 in. wide R-19 batt?
When studs are 24 in. on center, a 24 in. wide batt is meant to fill the bay in one piece, avoiding a longitudinal seam that can wrinkle or gap. M51 is catalogued with that geometry for R-19, 96 in. long modules.
Is 128 sq ft always the same batt count?
Is 128 sq ft always the same batt count?
Distributors publish 128 sq ft per package for this listing. The exact batt count can vary with master-pack changes—confirm on the bag label and data sheet for the lot you receive.
Can I use M51 in metal studs?
Can I use M51 in metal studs?
Owens Corning’s general applications list includes metal-framed walls and floors. Still verify cavity depth, screw flutes, and any project-specific UL assemblies before you assume compatibility.
Does kraft facing control sound?
Does kraft facing control sound?
The mass and airflow resistance of a filled cavity drive most mid-frequency STC gains. Kraft adds a vapor-retarder function; it is not a standalone acoustic upgrade—detail airtight drywall, openings, and back-to-back outlets per the acoustic spec.