Johns Manville R-13 Kraft-Faced Fiberglass Roll Insulation, 40-sq ft Coverage, 15-in W x 32-ft L (B1284)R 13 Kraft Faced Fiberglass Roll Insulation, 40 sq ft Johns Manville R 13 kraft faced fiberglass roll insulation is designed for 2x4 wood stud walls, delivering thermal performance and sound control with an integrated vapor retarder. Each 15 in x 32 ft roll covers 40 sq ft and is formaldehyde free for improved indoor air quality. Key Features: Built In Vapor Retarder: Kraft facing provides moisture control in exterior wall cavities. Energy & Sound

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

Johns Manville R-13 kraft-faced fiberglass roll insulation is designed for 2x4 wood-stud walls, delivering thermal performance and sound control with an integrated vapor retarder. Each 15-in x 32-ft roll covers 40 sq ft and is formaldehyde-free for improved indoor air quality.

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Key Features:

• Built-In Vapor Retarder: Kraft facing provides moisture control in exterior wall cavities.
• Energy & Sound Performance: R-13 thermal rating with sound-dampening properties for quieter rooms.
• Sized for 2x4 Walls: 15-in width fits 16-in on-center wood studs; 32-ft roll for long runs.
• Easy Installation: Press in place and staple flanges where needed; noncorrosive to pipes and wiring.
• Health & Sustainability: Formaldehyde-free fiberglass, GREENGUARD Gold and SCS certified.

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Specifications Table:

Specification	Details
Insulation Type	Fiberglass
Faced/Unfaced	Kraft faced
R-Value	13
R-Value per Inch	3.7143
Coverage Area	40 sq ft
Width	15 in
Length	32 ft
Thickness	3.5 in
Framing Type	Wood studs
Stud Spacing	16 in on center
Formaldehyde Free	Yes
Sound Barrier	Yes
Vapor Retardant	Yes
ENERGY STAR Certified	Yes (Seal and Insulate partner)
GREENGUARD Gold Certified	Yes
SCS Recycled Content	Certified
For Use in Walls	Yes
Fits 2 x 4 Walls	Yes
Fits 2 x 6 Walls	No
Package Type	Individual pack
Total Package Quantity	1
Package Count	1
Package Weight	9.91 lb
Bag Dimensions (L x W x D)	15.5 x 19 x 27 in
Warranty	1-year limited
Reflective	No
CA Prop 65 Warning	No
UNSPSC	30141500
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 Duct	No
For Use in Electrical	No
For Use in Garage Doors	No
For Use in Masonry	No
For Use in Plumbing	No
For Use in Vents	No
For Use in Windows	No

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Frequently Asked Questions (FAQ):

Q: What wall framing is this roll designed for?
A: It’s sized for 2x4 wood-stud walls with 16-in on-center spacing and a 3.5-in thickness.

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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: Does it control moisture?
A: Yes, the kraft facing acts as a vapor retarder to help manage moisture in concealed applications.

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

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Q: Can I install it myself?
A: Yes. Press the roll between studs and staple the tabs if additional securement is needed.

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Quiet Comfort, Seamlessly Wrapped

This kraft-faced insulation cocoons your walls in a soft hush, elevating comfort while keeping lines clean and concealed. I love the warm, natural kraft facing—it tucks neatly into 2x4 bays for a tailored fit. Pair it with crisp drywall and matte black hardware to craft a serene, gallery-like backdrop. It’s a discreet essential for refined, luxurious living that feels as good as it looks.

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Upgrade your 2x4 walls with JM R-13 kraft-faced rolls today for quieter, more efficient comfort in every room.