R-38 Unfaced Fiberglass Batt Insulation, 16-in x 48-in

High R-38 thermal and acoustic fiberglass batts designed for wood-stud attics. Unfaced, formaldehyde-free batts come pre-cut for 16-in on-center framing and deliver 42.66 sq ft of coverage per bag.

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Key Features:

• Energy Efficiency & Comfort: R-38 batts improve heating/cooling performance and provide sound control in attics and ceilings.
• Pre-Cut Convenience: 16-in x 48-in batts fit standard 16-in on-center joists; simple press-in-place installation.
• Durable, Noncorrosive Material: Fiberglass will not rot, mildew, or deteriorate and is noncorrosive to pipes, wiring, and metal studs.
• Formaldehyde-Free & Certified: GREENGUARD Gold and SCS certifications; qualifies for ENERGY STAR Seal and Insulate program.
• Add to Existing Insulation: Unfaced design without vapor barrier is ideal for topping up attic insulation.

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Specifications Table:

Specification	Details
Coverage Area	42.66 sq ft
Length	48 in
Width	16 in
Thickness	13 in
Faced/Unfaced	Unfaced
Insulation Type	Fiberglass
Maximum R-Value	R-38
R-Value per Inch	2.923
Stud Spacing	16 in on-center
Framing Type	Wood studs
Formaldehyde Free	Yes
For Use in Attics	Yes
For Use in Ceilings	Yes
For Use in Floors	Yes
For Use in Walls	No
Vapor Retardant	No
Sound Barrier	Yes
ENERGY STAR Certified	Yes (Seal & Insulate partner)
GREENGUARD Gold Certified	Yes
Warranty	1-year limited
Bag Dimensions (L x W x D)	16.5 x 20 x 50 in
Package Weight	22 lbs
Package Count	8 pieces per bag
Coverage per Bag	42.66 sq ft
UNSPSC	11162400

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Frequently Asked Questions (FAQ):

Q: Can I install these batts over existing attic insulation?
A: Yes. Because they are unfaced (no vapor barrier), they can be added on top of existing insulation in attics.

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Q: What framing do these batts fit?
A: They are pre-cut to 16-in x 48-in for 16-in on-center wood-stud framing.

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Q: Where can this insulation be used?
A: Designed primarily for attics and ceilings; also suitable for floors. Not for walls or crawlspaces per specs.

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Q: Do I need special tools to install?
A: No. Batts are press-in-place; a utility knife for trimming and protective gear are recommended.

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Q: Is the product low-VOC or safer for indoor air?
A: Yes. It is formaldehyde-free and GREENGUARD Gold certified for indoor air quality.

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A cloud-soft layer of quiet, cozy efficiency

This insulation drapes your attic in a serene, plush blanket, tempering extremes and softening sound. The R-38 performance and clean, unfaced profile offer a crisp, tailored finish that feels modern and purposeful. Pair it with warm wood tones and strategic lighting to craft an attic retreat that’s both functional and refined. It’s a smart essential for elevating comfort and luxury at home.

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Upgrade your attic with JM R-38 batts today for a quieter, more energy-efficient home.