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.

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Key Features:

• High R-Value Performance: R-38 thermal resistance boosts energy efficiency in attics and ceilings
• Unfaced Convenience: No vapor barrier—ideal 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

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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

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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.

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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.

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Q: Where can this be used?
A: Designed for wood-framed attics, ceilings and floors; not intended for walls or masonry.

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Q: What certifications does it have?
A: Formaldehyde Free and GREENGUARD Gold certified; ENERGY STAR partner product.

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Q: What is the thickness of each batt?
A: Approximately 12 inches thick to achieve R-38.

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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. It’s a discreet essential that elevates comfort and signals sophisticated, energy-savvy living.

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Upgrade your attic with JM R-38 batts today and lock in quieter, more energy-efficient comfort year-round.