Name: Johns Manville R- 13 Wall Kraft faced Fiberglass Roll Insulation 40-sq ft ( 15-in W x 32-ft L ) Individual pack
Brand: Johns Manville
SKU: 3032423
Rating: 4.7 (1534 reviews)

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Johns Manville kraft-faced formaldehyde-free™ fiberglass insulation is paper-faced to help control moisture in concealed applications such as exterior walls.

Kraft-faced fiberglass roll insulation for use in 2x4 wood-framed walls and provides a built-in vapor barrier for moisture control
Improves energy efficiency and provides sound control
Rolls are designed for long, unobstructed spaces with 16-in on-center stud spacing
Simple to install, press in place between studs and staple tabs to framing if additional securement is required
Will not rot, mildew or deteriorate and is noncorrosive to pipes, wiring and metal studs
JM is a partner of the Seal and Insulate with ENERGY STAR program
SCS Recycled Content certification
GREENGUARD Gold Certified for office indoor air quality and SCS Certified for home indoor air quality

General
Total Package Quantity	1	Package Type	Individual pack
Package Count	1	Insulation Type	Fiberglass
Framing Type	Wood studs

Dimensions
Coverage Area (Sq. Feet)	40	R-Value per Inch	3.71
Length (Feet)	32	Width (Inches)	15
Bag Dimensions (L x W x D)	15.5 x 19 x 27	Maximum R-Value	13
Thickness (Inches)	3.5	Package Weight (lbs.)	9.91

Features
Reflective	No	Vapor Retardant	Yes
Stud Spacing (Inches)	16	Faced/Unfaced	Kraft faced
Sound Barrier	Yes	Formaldehyde Free	Yes

Certifications
CA Residents: Prop 65 Warning(s)	No	GREENGUARD Gold Certified	Yes
ENERGY STAR Certified	Yes

Warranty
Warranty	Limited lifetime

Compatibility
For Use in Crawlspaces	No	Fits 2 x 6 Walls	No
For Use in Ceilings	No	For Use in Masonry	No
For Use in Electrical	No	For Use in Plumbing	No
For Use in Duct	No	For Use in Walls	Yes
For Use in Doors	No	For Use in Vents	No
For Use in Floors	No	For Use in Windows	No
For Use in Garage Doors	No	For Use in Basements	No
Fits 2 x 4 Walls	Yes	For Use in Attics	No

Miscellaneous
UNSPSC	30141500

Check out the Best Selling Roll Insulation on Lowes.com

Review

4.7 out of 5

1534 Reviews

96% Recommend this product

Ratings may include incentivized customer reviews.

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+ 42

What Customers Are Saying

The insulation is easy to work with and install, providing effective insulation that keeps spaces warm in winter and cool in summer. Customers praised the high quality, ease of use, and good value. The encapsulated design with plastic wrapping helps reduce skin irritation. The insulation also offers good sound insulation.

Customer review summary generated by AI, including incentivized reviews.

1534 Customer Reviews

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Applies great

Would Recommend

I got this to seal outside of window, I believe it’s will do the job required

DW1013October 11, 2026
Verified Purchaser

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Easy install.

Would Recommend

Super easy to install!

TmoneyOctober 8, 2026
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Would Recommend

This product does everything it’s suppose to do.

NanaSeptember 28, 2026
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COMPARE PRODUCTS

		Name	Current Item Johns ManvilleR- 13 Wall Kraft faced Fiberglass Roll Insulation 40-sq ft ( 15-in W x 32-ft L ) Individual pack
		Ratings	1534
		Width (Inches)	15
		Thickness (Inches)	3.5
		For Use in Attics
Unique BargainsInsulation Sheet 1.5mx0.5mx5mm Embossed Aluminum Foil Waterproof Heat Resistant Thermal Barrier for Roof Wall HVAC Duct Pipe Rubber Foam	Owens CorningR- 13 Kraft faced Fiberglass Roll Insulation 40-sq ft ( 15-in W x 32-ft L ) Individual pack	Johns ManvilleR- 30.0 Attic Unfaced Fiberglass Roll Insulation 31.25-sq ft ( 15.0-in W x 25.0-ft L ) Individual pack	ReflectixR- 21 Attic Wall Unfaced Reflective Roll Insulation 50-sq ft ( 24-in W x 25-ft L ) Individual pack	Owens CorningR- 15 Kraft faced Fiberglass Roll Insulation 30-sq ft ( 15-in W x 24-ft L ) Individual pack	Owens CorningR- 19 Kraft faced Fiberglass Roll Insulation 75.07-sq ft ( 23-in W x 39.2-ft L ) Individual pack	Owens CorningR- 19 Kraft faced Fiberglass Roll Insulation 48.96-sq ft ( 15-in W x 39.2-ft L ) Individual pack	Owens CorningR- 30 Attic Unfaced Fiberglass Roll Insulation 31.25-sq ft ( 15-in W x 25-ft L ) Individual pack	Owens CorningR- 13 Single faced Fiberglass Roll Insulation 40-sq ft ( 15-in W x 32-ft L ) Individual pack
	3513	493	611	3209	27	3087	3097	1991
9.84	15	15	24	15	23	15	15	15
	3.5	10.25	0.3125	3.5	6.5	6.25	9	3.5