R-13 Unfaced Fiberglass Batt Insulation (15 in x 105 in, 120.31 sq ft)
Johns Manville JM R-13 unfaced fiberglass batts are pre-cut to fit standard 2x4 wood-stud wall cavities for dependable thermal performance and sound control. The unfaced design (no vapor barrier) makes it easy to add to existing insulation where code allows.
Key Features:
- Sized for 2x4 Wall Cavities: 15-in wide batts fit 16-in on-center wood studs and standard 8-ft wall applications.
- Unfaced for Flexible Use: No vapor retarderideal for adding to existing insulation or where a separate vapor control layer is used.
- Energy & Comfort Performance: R-13 thermal resistance helps reduce heat transfer and improve energy efficiency.
- Sound Control: Fiberglass batt construction helps reduce sound transmission through wall assemblies.
- Formaldehyde-Free & Durable: Formaldehyde-free insulation that wont rot, mildew, or corrode pipes, wiring, or metal components.
Specifications Table:
| Specification | Details |
| Brand | JM (Johns Manville) |
| Category | Batt Insulation |
| Insulation Type | Fiberglass |
| Maximum R-Value | 13 |
| R-Value per Inch | 4.2857 |
| Faced/Unfaced | Unfaced |
| Vapor Retardant | No |
| Width (in) | 15 |
| Length (in) | 105 |
| Thickness (in) | 3.5 |
| Coverage Area (sq ft) | 120.31 |
| Stud Spacing (in) | 16 |
| Fits 2 x 4 Walls | Yes |
| Fits 2 x 6 Walls | No |
| Framing Type | Wood studs |
| For Use in Walls | Yes |
| For Use in Basements | Yes |
| For Use in Crawlspaces | No |
| For Use in Ceilings | No |
| For Use in Attics | No |
| Sound Barrier | Yes |
| Formaldehyde Free | Yes |
| ENERGY STAR Certified | Yes |
| GREENGUARD Gold Certified | Yes |
| CA Residents: Prop 65 Warning(s) | No |
| Package Type | Multi-pack |
| Total Package Quantity | 44 |
| Package Count | 11 |
| Multi-Pack Quantity | 4 |
| Bag Dimensions (L x W x D) | 20 x 20 x 50 |
| Package Weight (lb) | 19.81 |
| Material | Fiberglass |
| Manufacturer | Johns Manville |
| Manufacturer Part # | U1369 |
| For use with | Wood Stud Framing |
| Application | For New Construction, Remodels, Walls, Floors, Ceilings, Basements, Attics and Crawlspaces |
| Flame Spread Index | <25 |
| Smoke Developed Index | <50 |
| Temperature Rating | 850 deg F |
| Water Vapor Sorption | <5 % |
| Standards/Certifications | ASTM C665 Type I; ASTM E136; IBC; Energy Star Certified; Greenguard Gold Certified; Indoor Air Quality Certified; NAIMA 16 CFR Part 460; Recycled Content Certified |
| UNSPSC | 11162400 |
Frequently Asked Questions (FAQ):
Q: What wall framing is this insulation designed for?
A: Its designed for 2x4 wood-stud walls with 16-inch on-center stud spacing (15-inch wide batts).
Q: Does this batt insulation include a vapor barrier?
A: Nothis product is unfaced and does not include a vapor retarder.
Q: Can I install it in basements?
A: Yes, it is listed for use in basements.
Q: How is it installed?
A: Batts are typically pressed into place between studs; they can also be cut to fit around obstructions as needed.
Q: What certifications does it have?
A: It is listed as ENERGY STAR Certified and GREENGUARD Gold Certified, and notes recycled content certification.
Quiet comfort, beautifully concealed.
Think of this as the invisible layer of luxurysoftening sound and stabilizing temperature so a room feels instantly more refined. The unfaced fiberglass batt slips cleanly into 2x4 wall cavities, delivering R-13 performance without adding visual bulk. Pair it with intentional lighting and tactile wall finishes, and youll notice the difference: calmer acoustics, steadier comfort, and a home that feels thoughtfully composed. Its the behind-the-walls essential that makes everyday living feel elevated.
Upgrade your 2x4 walls with JM R-13 unfaced batts for better comfort and sound controladd it to your project today.
