Johns Manville R-19 Unfaced Fiberglass Roll Insulation, 48.96-sq ft Coverage (15-in W x 39.16-ft L) – Multi-Pack, B373SR 19 Unfaced Fiberglass Roll Insulation, 15 in x 39. 16 ft Improve thermal performance and sound control with Johns Manville R 19 unfaced fiberglass roll insulation. Sized for 2x6 wood stud walls and long runs with 16 in on center spacing, each roll covers 48. 96 sq ft and installs easily by pressing in place. Key Features: Energy Efficiency + Sound Control: R 19 fiberglass helps reduce heat loss and unwanted noise in walls and floors Sized for 2x6

R-19 Unfaced Fiberglass Roll Insulation, 15-in x 39.16-ft

Improve thermal performance and sound control with Johns Manville R-19 unfaced fiberglass roll insulation. Sized for 2x6 wood-stud walls and long runs with 16-in on-center spacing, each roll covers 48.96 sq ft and installs easily by pressing in place.

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Key Features:

• Energy Efficiency + Sound Control: R-19 fiberglass helps reduce heat loss and unwanted noise in walls and floors
• Sized for 2x6 Walls: 15-in width fits 16-in on-center wood studs for long, unobstructed bays
• Unfaced Design: No vapor retarder—ideal for adding over existing insulation where needed
• Healthy Home Certifications: GREENGUARD Gold and SCS certified; formaldehyde-free
• Durable and Easy to Install: Won’t rot, mildew, or corrode pipes and metal; simply press in place

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Specifications Table:

Specification	Details
R-Value	19
Coverage Area	48.96 sq ft
Width	15 in
Length	39.16 ft
Thickness	6.5 in
Insulation Type	Fiberglass
Faced/Unfaced	Unfaced
Framing Type	Wood studs
Stud Spacing	16 in on center
Fits 2 x 6 Walls	Yes
Fits 2 x 4 Walls	No
For Use in Walls	Yes
For Use in Floors	Yes
For Use in Basements	Yes
For Use in Attics	No
For Use in Ceilings	No
For Use in Crawlspaces	No
Reflective	No
Vapor Retardant	No
Sound Barrier	Yes
Formaldehyde Free	Yes
ENERGY STAR Certified	Yes (Seal and Insulate partner)
GREENGUARD Gold Certified	Yes
Package Type	Multi-pack
Package Count	1
Total Package Quantity	1
Bag Dimensions (L x W x D)	15.5 x 19 x 26 in
Package Weight	12.1 lb
R-Value per Inch	2.92
Warranty	1-year limited
UNSPSC	30141500

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Frequently Asked Questions (FAQ):

Q: How much area does one roll cover?
A: Each roll covers 48.96 square feet (15 in. wide x 39.16 ft. long).

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Q: Is this insulation faced?
A: No. It is unfaced and does not include a vapor retarder.

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Q: What wall framing is it designed for?
A: It’s sized for 2x6 wood-stud walls with 16-in on-center spacing.

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Q: Can it be used for sound control?
A: Yes. It provides sound control in addition to thermal performance.

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Q: Is it safe for indoor air quality?
A: Yes. It is formaldehyde-free and GREENGUARD Gold certified.

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A Quiet, Cozy Backbone for Modern Walls

This R-19 fiberglass roll tucks neatly into 2x6 stud bays, wrapping rooms in a soft hush and steady comfort. I love its unfaced profile—clean, minimal, and adaptable when layering for performance. Pair it with crisp drywall and a serene paint palette to let textures and furnishings sing without echo. It’s an understated essential that elevates living with quiet luxury and energy-wise design.

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Upgrade your walls with R-19 performance today and enjoy quieter, more efficient comfort year-round.