Johns Manville JM R-13 Unfaced Fiberglass Batt Insulation for 2x4 Walls, 15 in x 105 in, 120.31 sq ftR 13 Unfaced Fiberglass Batt Insulation (15 in x 105 in, 120. 31 sq ft) Johns Manville JM R 13 unfaced fiberglass batts are pre cut to fit standard 2x4 wood stud wall cavities for dependable thermal performance and sound control. The unfaced design (no vapor barrier) makes it easy to add to existing insulation where code allows. Key Features: Sized for 2x4 Wall Cavities: 15 in wide batts fit 16 in on center wood studs and standard 8 ft wall

R-13 Unfaced Fiberglass Batt Insulation (15 in x 105 in, 120.31 sq ft)

Johns Manville JM R-13 unfaced fiberglass batts are pre-cut to fit standard 2x4 wood-stud wall cavities for dependable thermal performance and sound control. The unfaced design (no vapor barrier) makes it easy to add to existing insulation where code allows.

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Key Features:

• Sized for 2x4 Wall Cavities: 15-in wide batts fit 16-in on-center wood studs and standard 8-ft wall applications.
• Unfaced for Flexible Use: No vapor retarder—ideal for adding to existing insulation or where a separate vapor control layer is used.
• Energy & Comfort Performance: R-13 thermal resistance helps reduce heat transfer and improve energy efficiency.
• Sound Control: Fiberglass batt construction helps reduce sound transmission through wall assemblies.
• Formaldehyde-Free & Durable: Formaldehyde-free insulation that won’t rot, mildew, or corrode pipes, wiring, or metal components.

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Specifications Table:

Specification	Details
Brand	JM (Johns Manville)
Category	Batt Insulation
Insulation Type	Fiberglass
Maximum R-Value	13
R-Value per Inch	4.2857
Faced/Unfaced	Unfaced
Vapor Retardant	No
Width (in)	15
Length (in)	105
Thickness (in)	3.5
Coverage Area (sq ft)	120.31
Stud Spacing (in)	16
Fits 2 x 4 Walls	Yes
Fits 2 x 6 Walls	No
Framing Type	Wood studs
For Use in Walls	Yes
For Use in Basements	Yes
For Use in Crawlspaces	No
For Use in Ceilings	No
For Use in Attics	No
Sound Barrier	Yes
Formaldehyde Free	Yes
ENERGY STAR Certified	Yes
GREENGUARD Gold Certified	Yes
CA Residents: Prop 65 Warning(s)	No
Package Type	Multi-pack
Total Package Quantity	44
Package Count	11
Multi-Pack Quantity	4
Bag Dimensions (L x W x D)	20 x 20 x 50
Package Weight (lb)	19.81
Material	Fiberglass
Manufacturer	Johns Manville
Manufacturer Part #	U1369
For use with	Wood Stud Framing
Application	For New Construction, Remodels, Walls, Floors, Ceilings, Basements, Attics and Crawlspaces
Flame Spread Index	<25
Smoke Developed Index	<50
Temperature Rating	850 deg F
Water Vapor Sorption	<5 %
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
UNSPSC	11162400

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Frequently Asked Questions (FAQ):

Q: What wall framing is this insulation designed for?
A: It’s designed for 2x4 wood-stud walls with 16-inch on-center stud spacing (15-inch wide batts).

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Q: Does this batt insulation include a vapor barrier?
A: No—this product is unfaced and does not include a vapor retarder.

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Q: Can I install it in basements?
A: Yes, it is listed for use in basements.

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Q: How is it installed?
A: Batts are typically pressed into place between studs; they can also be cut to fit around obstructions as needed.

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Q: What certifications does it have?
A: It is listed as ENERGY STAR Certified and GREENGUARD Gold Certified, and notes recycled content certification.

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Quiet comfort, beautifully concealed.

Think of this as the invisible layer of luxury—softening sound and stabilizing temperature so a room feels instantly more refined. The unfaced fiberglass batt slips cleanly into 2x4 wall cavities, delivering R-13 performance without adding visual bulk. Pair it with intentional lighting and tactile wall finishes, and you’ll notice the difference: calmer acoustics, steadier comfort, and a home that feels thoughtfully composed. It’s the behind-the-walls essential that makes everyday living feel elevated.

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Upgrade your 2x4 walls with JM R-13 unfaced batts for better comfort and sound control—add it to your project today.