Listed ~170.67 sq ft per package for medium-to-large interior wall takeoffs
Key features
16 in. module width for 16 in. o.c. bays with 96 in. eight-foot batt length
R-11 labeled performance where assemblies allow lower cavity R-value than R-13
Technical specifications
| R-Value | 11.0 |
|---|---|
| Thickness | 3.5 in |
| Width | 16.0 in |
| Length | 96.0 in |
| Coverage | 170.67 sq ft/pack |
| Material | Fiberglass (PINK Next Gen), unfaced |
| Fire rating | ASTM C665; unfaced glass fibers classified noncombustible per ASTM E136 in manufacturer documentation. Unfaced PINK Next Gen acceptable ICC construction types I through V when installed per Owens Corning literature. |
| 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 | 16 in. width for 16 in. on-center stud or joist spacing |
| 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 170.67 square feet per package (IDI-listed coverage). Primary use: interior walls, floors, and ceilings on 16 in. on-center modules where R-11-class unfaced fiberglass meets the prescriptive or performance path and eight-foot batt logistics fit the job.
M41 lists 3.5 in. labeled thickness, 16 in. width, and 96 in. length on IDI Insulation. The 16 in. module aligns with common 14-1/2 in. clear bays in residential framing; unfacing keeps vapor strategy separate from the insulation SKU so smart membranes or poly layers can be sequenced per the QA plan.
IDI markets GREENGUARD Gold certification and formaldehyde-free messaging for this listing alongside Next Gen handling benefits. R-11 is lower labeled resistance than typical exterior 2×4 R-13 targets—use M41 where the code table and assembly designer allow R-11 cavity fill.
Use the PINK Next Gen Fiberglas insulation product data sheet linked from IDI for tested properties and code references. Overhead installs may need supports or strapping per jobsite requirements even when batts are stiff.
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
M41 versus narrower 15 in. wide R-11 batts?
M41 versus narrower 15 in. wide R-11 batts?
Width and coverage change the takeoff. M41 is distributor-listed at 16 × 96 in. with about 170.67 square feet per package—always bid using the distributor-listed dimensions for the exact SKU.
Is R-11 acceptable for my exterior wall?
Is R-11 acceptable for my exterior wall?
Depends on the adopted IECC cycle and your jurisdiction. M41 is commonly used for interior partitions and assemblies that allow R-11—confirm before specifying on exterior line-of-drawings.
How many bags should I order?
How many bags should I order?
Divide net insulated area by about 170.67 square feet per package and add a waste factor for openings and cuts.
Does M41 need poly?
Does M41 need poly?
Only if your assembly and climate package require a separate vapor retarder—unfaced batts do not add factory kraft.