R-13 Unfaced Fiberglass Wall Batt Insulation

Johns Manville R-13 unfaced fiberglass batts deliver thermal and acoustic performance for 2x4 wood-stud walls. Pre-cut 15-in x 105-in batts cover 120.31 sq ft, install easily between 16-in O.C. studs, and won’t rot, mildew, or corrode.

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Key Features:

• Energy Efficiency + Sound Control: R-13 fiberglass reduces heat loss and dampens noise between rooms
• Pre-Cut Convenience: 15-in x 105-in batts sized for 8-ft walls with 16-in on-center studs
• Unfaced Design: No vapor retarder—ideal for adding over existing insulation where code allows
• Healthy Home Certifications: Formaldehyde-free, GREENGUARD Gold and SCS certified for indoor air quality
• Durable Performance: Noncorrosive to pipes and wiring; will not rot, mildew, or deteriorate

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Specifications Table:

Specification	Details
Coverage Area (Sq. Feet)	120.31
Length (Inches)	105
Width (Inches)	15
Thickness (Inches)	3.5
Faced/Unfaced	Unfaced
Insulation Type	Fiberglass
Maximum R-Value	13
R-Value per Inch	4.2857
Fits 2 x 4 Walls	Yes
Fits 2 x 6 Walls	No
Stud Spacing (Inches)	16
For Use in Walls	Yes
For Use in Basements	Yes
For Use in Attics	No
For Use in Ceilings	No
For Use in Floors	No
For Use in Crawlspaces	No
For Use in Doors	No
For Use in Garage Doors	No
For Use in Windows	No
For Use in Masonry	No
For Use in Plumbing	No
For Use in Vents	No
For Use in Duct	No
Formaldehyde Free	Yes
Framing Type	Wood studs
Sound Barrier	Yes
Vapor Retardant	No
ENERGY STAR Certified	Yes
GREENGUARD Gold Certified	Yes
Warranty	1-year limited
UNSPSC	11162400
Bag Dimensions (L x W x D)	20 x 20 x 50
Package Weight (lbs.)	19.81
Multi-Pack Quantity	4
Package Count	11
Total Package Quantity	44
Package Type	Multi-pack

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Frequently Asked Questions (FAQ):

Q: How much area does one package cover?
A: 120.31 sq ft of wall area.

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Q: What wall framing is this sized for?
A: Pre-cut for 2x4 wood-stud walls with 16-in on-center spacing and 8-ft height.

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Q: Does this have a vapor barrier?
A: No. It’s unfaced and contains no vapor retarder.

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Q: Where can I use it?
A: Designed for interior/exterior 2x4 walls and suitable for basements; not intended for attics, ceilings, floors, or crawlspaces per specs.

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Q: Is it formaldehyde-free and certified?
A: Yes—formaldehyde-free and GREENGUARD Gold and SCS certified for indoor air quality.

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Quiet, Cozy Walls with Clean Lines

These R-13 batts slip into 2x4 walls like a tailored suit, softening the acoustics and wrapping the room in a quiet hush. The unfaced, snowy fibers keep the profile sleek while boosting thermal comfort. Pair with smooth gypsum walls and pale timber trim for a warm, gallery-like calm. It’s a discreet upgrade that feels undeniably luxurious day after day.

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Upgrade your 2x4 walls with JM R-13 batts today for fast comfort, quieter rooms, and energy savings.