At a Glance
R-Value per Inch: 3.8182
Stud Spacing: 24 (In.)
Sound BarrierJohns Manville R- 21 Wall Kraft faced Fiberglass Batt Insulation 103.97-sq ft ( 23-in W x 93-in L)
Item #217823 |
Model #K1231
Kraft-faced fiberglass batt insulation ideal for sound control in 2x6 wood-framed walls, basements, crawlspaces and provides a built-in vapor barrier for moisture control
Improves energy efficiency and provides sound control
Batts are pre-cut for use in standard 8-ft walls with 24-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 | |||
|---|---|---|---|
Package Type | Individual pack | Package Count | 7 |
Total Package Quantity | 7 | Framing Type | Wood studs |
Insulation Type | Fiberglass | ||
Dimensions | |||
|---|---|---|---|
Bag Dimensions (L x W x D) | 23.5 x 20 x 49 | Thickness (Inches) | 5.5 |
Coverage Area (Sq. Feet) | 103.97 | Width (Inches) | 23 |
Length (Inches) | 93 | R-Value per Inch | 3.8182 |
Package Weight (lbs.) | 44.44 | Maximum R-Value | 21 |
Features | |||
|---|---|---|---|
Faced/Unfaced | Kraft faced | Stud Spacing (Inches) | 24 |
Formaldehyde Free | Yes | Vapor Retardant | Yes |
Sound Barrier | Yes | ||
Certifications | |||
|---|---|---|---|
CA Residents: Prop 65 Warning(s) | No | GREENGUARD Gold Certified | Yes |
ENERGY STAR Certified | Yes | ||
Compatibility | |||
|---|---|---|---|
For Use in Basements | Yes | For Use in Garage Doors | No |
For Use in Crawlspaces | Yes | For Use in Masonry | No |
For Use in Ceilings | No | For Use in Plumbing | No |
For Use in Attics | No | For Use in Vents | No |
For Use in Doors | No | For Use in Walls | Yes |
For Use in Duct | No | For Use in Windows | No |
For Use in Electrical | No | Fits 2 x 4 Walls | No |
For Use in Floors | No | Fits 2 x 6 Walls | Yes |
Miscellaneous | |||
|---|---|---|---|
UNSPSC | 11162400 | ||
Check out the Best Selling Batt Insulation on Lowes.com
Ratings may include incentivized customer reviews.
What Customers Are Saying
This insulation product generally performs well, with customers praising its strong insulating properties and ease of installation. However, some have reported quality control issues, such as damaged or inconsistent batts. While the majority of users seem satisfied with the product's insulating performance and usability, the manufacturer may need to address the reported quality concerns to ensure a more consistent customer experience.
Customer review summary generated by AI, including incentivized reviews.Customer Sentiment
Easy to install, thick insulation
Super thick insulation really fluffed up upon opening the package. Pre-cut lengths are easy to manipulate in small space.
From R- 19 Wall Kraft faced Fiberglass Batt Insulation 133.68-sq ft ( 23-in W x 93-in L) Verified Purchaser
Johns Manville 6.5” deep Kraft faced insulation
For outbuilding pump house attic floor insulation worked great for keeping cold, heat and moisture from interior of space.
From R- 19 Wall Kraft faced Fiberglass Batt Insulation 133.68-sq ft ( 23-in W x 93-in L) Verified Purchaser
What expected
Just what I expected - nothing more
From R- 19 Wall Kraft faced Fiberglass Batt Insulation 133.68-sq ft ( 23-in W x 93-in L) Verified Purchaser
well made insulation
Easy to put up - good quality
From R- 19 Wall Kraft faced Fiberglass Batt Insulation 133.68-sq ft ( 23-in W x 93-in L) Verified Purchaser
Still suggest wearing protective gear
Very easy to install and fit perfectly between the 2X6’s.
From R- 19 Wall Kraft faced Fiberglass Batt Insulation 133.68-sq ft ( 23-in W x 93-in L) Verified Purchaser
isolation
good product fair price
From R- 19 Wall Kraft faced Fiberglass Batt Insulation 133.68-sq ft ( 23-in W x 93-in L) Verified Purchaser
21 Questions
21 Questions
7
Answers
4
Answers
3
Answers
2
Answers
2
Answers
2
Answers
2
Answers
2
Answers
2
Answers
1
Answer
Sparkgapper, we are so glad to hear that our JM insulation met your expectations. We hope you choose us again in the future!