R-38 Unfaced Fiberglass Attic Batt Insulation, 48 sq ft
Formaldehyde-free Johns Manville unfaced fiberglass batts deliver R-38 thermal performance for attics, ceilings and floors. Pre-cut to fit 16-in on-center wood studs, these durable batts improve energy efficiency and help reduce noise without a vapor barrier.
Key Features:
- High R-Value Performance: R-38 thermal resistance boosts energy efficiency in attics and ceilings
- Unfaced Convenience: No vapor barrierideal for layering over existing insulation
- Pre-Cut Fit: 16-in x 48-in batts sized for standard 16-in OC wood framing; 48-sq ft per bag
- Indoor Air Quality: Formaldehyde-free and GREENGUARD Gold certified
- Durable & Easy to Install: Will not rot or mildew; simple press-in-place installation
Specifications Table:
| Specification | Details |
| Insulation Type | Fiberglass |
| R-Value | R-38 |
| Faced/Unfaced | Unfaced |
| Width (Inches) | 16 |
| Length (Inches) | 48 |
| Thickness (Inches) | 12 |
| Coverage Area (Sq. Feet) | 48 |
| Stud Spacing (Inches) | 16 |
| Framing Type | Wood studs |
| For Use in Attics | Yes |
| For Use in Ceilings | Yes |
| For Use in Floors | Yes |
| For Use in Walls | No |
| Formaldehyde Free | Yes |
| Sound Barrier | Yes |
| Vapor Retardant | No |
| ENERGY STAR Certified | Yes |
| GREENGUARD Gold Certified | Yes |
| Package Weight (lbs.) | 26.15 |
| Bag Dimensions (L x W x D) | 20 x 20 x 50 |
| R-Value per Inch | 3.1667 |
| Package Type | Multi-pack |
| Package Count | 9 |
| Multi-Pack Quantity | 4 |
| Total Package Quantity | 36 |
| Warranty | 1-year limited |
| UNSPSC | 11162400 |
Frequently Asked Questions (FAQ):
Q: How much area does one bag cover?
A: Each bag covers 48 square feet with pre-cut 16-in x 48-in batts.
Q: Can I add these batts over existing insulation?
A: Yes. Because they are unfaced (no vapor barrier), they can be layered over existing insulation in attics.
Q: Where can this be used?
A: Designed for wood-framed attics, ceilings and floors; not intended for walls or masonry.
Q: What certifications does it have?
A: Formaldehyde Free and GREENGUARD Gold certified; ENERGY STAR partner product.
Q: What is the thickness of each batt?
A: Approximately 12 inches thick to achieve R-38.
Crisp, Quiet Comfort for Elevated Attics
This pristine, snow-white insulation layers your attic with a serene hush, refining the home from the top down. Its lofty 12-inch profile delivers a tailored, architectural neatness as it tucks cleanly between joists. Pair with matte-black hardware and pale wood decking for a modern, gallery-like attic storage zone. Its a discreet essential that elevates comfort and signals sophisticated, energy-savvy living.
Upgrade your attic with JM R-38 batts today and lock in quieter, more energy-efficient comfort year-round.
