R-13 Kraft-Faced Fiberglass Roll Insulation, 40-sq ft

Johns Manville R-13 kraft-faced fiberglass roll insulation is designed for 2x4 wood-framed walls, delivering thermal performance with built-in vapor retarder. Each 15-in by 32-ft roll covers 40 sq ft and helps improve energy efficiency and sound control.

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Key Features:

• Optimized for 2x4 Walls: 15-in width fits 16-in on-center studs for fast installation
• Moisture Control: Kraft-faced vapor retarder helps manage indoor humidity
• Energy & Sound Performance: R-13 fiberglass reduces heat loss and dampens noise
• Easy to Install: Press in place; staple tabs as needed for secure fit
• Healthy Home Certifications: Formaldehyde-free, GREENGUARD Gold and SCS certified

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Specifications Table:

Specification	Details
Coverage Area	40 sq ft
Length	32 ft
Width	15 in
Thickness	3.5 in
Faced/Unfaced	Kraft faced
Fits 2 x 4 Walls	Yes
Fits 2 x 6 Walls	No
For Use in Walls	Yes
For Use in Attics	No
For Use in Ceilings	No
For Use in Floors	No
For Use in Crawlspaces	No
For Use in Basements	No
For Use in Doors	No
For Use in Windows	No
For Use in Masonry	No
For Use in Duct	No
For Use in Electrical	No
For Use in Plumbing	No
For Use in Vents	No
Formaldehyde Free	Yes
Framing Type	Wood studs
Insulation Type	Fiberglass
Maximum R-Value	R-13
R-Value per Inch	3.71
Reflective	No
Sound Barrier	Yes
Stud Spacing	16 in on center
Vapor Retardant	Yes
ENERGY STAR Certified	Yes (program partner)
GREENGUARD Gold Certified	Yes
Warranty	1-year limited
Bag Dimensions (L x W x D)	15.5 x 19 x 27 in
Package Type	Multi-pack
Package Count	27
Total Package Quantity	27
UNSPSC	30141500

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Frequently Asked Questions (FAQ):

Q: What areas is this insulation intended for?
A: It is designed for use in 2x4 wood-framed walls with 16-in on-center stud spacing; not for attics or ceilings.

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Q: How much area does one roll cover?
A: Each roll covers 40 square feet (15-in W x 32-ft L).

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Q: Is a vapor barrier included?
A: Yes, the kraft facing acts as a built-in vapor retarder for moisture control.

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

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Q: What is the R-value?
A: R-13, with an approximate R-value per inch of 3.71.

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Quiet Comfort, Clean Lines

This kraft-faced roll tucks seamlessly into 2x4 framing, wrapping walls in a whisper of warmth and hush. I love the tailored paper face—it creates a neat, uniform backdrop during build-out. Pair it with crisp drywall and matte black hardware for a refined, sound-softened envelope. It’s an effortless upgrade that sets the tone for elevated, livable luxury.

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Upgrade your 2x4 walls with R-13 comfort and moisture control—add this Johns Manville roll insulation to your project today.