JM R-38 Unfaced Fiberglass Batt Insulation (24 in x 48 in x 12 in), 72 sq-ft
Regular price $75.63R-38 Unfaced Fiberglass Batt Insulation (24" x 48")
JM unfaced fiberglass batt insulation is designed to deliver strong thermal and acoustical performance for wood-stud cavities. Made with formaldehyde-free bonded glass fibers, it helps reduce heat transfer and sound transmission while resisting rot, mildew, and deterioration.
Key Features:
- High R-Value Performance: R-38 thermal resistance helps improve energy efficiency in attics, walls, floors, and ceilings.
- Formaldehyde-Free Fiberglass: Designed not to off-gas formaldehyde in the indoor environment.
- Sound-Dampening Comfort: Helps reduce sound transmission through wall, floor, and ceiling assemblies.
- Durable, Dimensionally Stable Batts: Bonded glass fibers resist slumping, settling, and breakdown during normal use.
- Broad Code/Program Compliance: Listed certifications include ASTM/IBC plus Energy Star and Greenguard Gold.
Specifications Table:
| Specification | Details |
|---|---|
| Brand | JM |
| Manufacturer | Johns Manville |
| Manufacturer Part Number | U1373 |
| Insulation Type | Batt insulation |
| Material | Fiberglass |
| Facing | Unfaced |
| R-Value | R-38 |
| Width | 24 in |
| Length | 48 in |
| Thickness | 12 in |
| Coverage | 72 sq-ft |
| Application | For new construction and remodels; walls, floors, ceilings, basements, attics and crawlspaces |
| For Use With | Wood stud framing |
| Flame Spread Index | <25 |
| Smoke Developed Index | <50 |
| Temperature Rating | 850 deg F |
| Water Vapor Sorption | <5 % |
| Item Name | Building and Residential Fiberglass |
| 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 |
Frequently Asked Questions (FAQ):
Q: Is this insulation faced or unfaced?
A: It is unfaced fiberglass batt insulation.
Q: What framing type is it intended for?
A: It is listed for use with wood stud framing.
Q: Where can it be used in the home?
A: It’s intended for new construction or remodels in walls, floors, ceilings, basements, attics, and crawlspaces.
Q: What are the batt dimensions and thickness?
A: Each batt is 24 in wide x 48 in long and 12 in thick.
Q: Does it have indoor air quality-related certifications?
A: It is listed as Greenguard Gold Certified and Indoor Air Quality Certified, and described as formaldehyde-free.
Quiet Luxury, Hidden in the Walls
Great rooms feel effortless when comfort is built in—this JM R-38 unfaced fiberglass batt creates a calmer, more temperature-stable envelope that lets the design breathe. Its clean, unfaced profile is all about flexibility, pairing seamlessly with layered finishes from plaster to paneling. Use it strategically to soften sound between living spaces and amplify that private, retreat-like mood. It’s the kind of invisible upgrade that makes a home feel undeniably elevated.
Upgrade comfort and efficiency—spec JM R-38 unfaced fiberglass batts to help keep your space quieter, cozier, and better insulated.
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