At a Glance
R-Value per Inch: 3.17
Stud Spacing: 24 (In.)
Sound BarrierJohns Manville R- 38 Attic Unfaced Fiberglass Batt Insulation 64-sq ft ( 24-in W x 48-in L)
Item #355168 |
Model #U366
Unfaced fiberglass batt insulation for use in wood-framed attics, ceilings, and floors and can be added to existing insulation
Improves energy efficiency and provides sound control
Batts are pre-cut in standard 4-ft length for use with 24-in on-center joist spacing
Simple to install, press in place between joists
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 | 8 |
Total Package Quantity | 8 | Framing Type | Wood studs |
Insulation Type | Fiberglass | ||
Dimensions | |||
|---|---|---|---|
Bag Dimensions (L x W x D) | 20 x 20 x 50 | Thickness (Inches) | 12 |
Coverage Area (Sq. Feet) | 64 | Width (Inches) | 24 |
Length (Inches) | 48 | R-Value per Inch | 3.17 |
Package Weight (lbs.) | 32.98 | Maximum R-Value | 38 |
Features | |||
|---|---|---|---|
Faced/Unfaced | Unfaced | Stud Spacing (Inches) | 24 |
Formaldehyde Free | Yes | Vapor Retardant | No |
Sound Barrier | 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 Basements | No | For Use in Garage Doors | No |
For Use in Crawlspaces | No | For Use in Masonry | No |
For Use in Ceilings | Yes | For Use in Plumbing | No |
For Use in Attics | Yes | For Use in Vents | No |
For Use in Doors | No | For Use in Walls | No |
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 | Yes | Fits 2 x 6 Walls | No |
Miscellaneous | |||
|---|---|---|---|
UNSPSC | 11162400 | ||
Check out the Best Selling Batt Insulation on Lowes.com
Ratings may include incentivized customer reviews.
What Customers Are Saying
The insulation product was widely praised for its effectiveness in improving temperature and sound control. Customers found it easy to install, with the pre-cut and pre-scored design simplifying the process. Many reported significant reductions in energy bills and noise levels after installation. While a few experienced minor issues, the majority found the insulation to be of high quality and durable, delivering strong performance benefits.
Customer review summary generated by AI, including incentivized reviews.Customer Sentiment
Quality insulation, easy installation
Easy to install. I’d recommend wearing gloves and a light mask to deal the fibers. Goes in easy and provides a good level of insulation. We used it in our attic space for a boost in energy efficiency. Happy with the results.
From R- 19 Wall Kraft faced Fiberglass Batt Insulation 87.18-sq ft ( 15-in W x 93-in L) Verified Purchaser
All Good
Packaged well. Everything that I expected
From R- 19 Wall Unfaced Fiberglass Batt Insulation 87.18-sq ft ( 15-in W x 93-in L) Verified Purchaser
Do not Use on 2x4 walls
Great product. Very thick.
From R- 30 Attic Kraft faced Fiberglass Batt Insulation 58.66-sq ft ( 16-in W x 48-in L) Verified Purchaser
Thank you for choosing Johns Manville for your project. Our packaging has specifications listed on it to help guide in selecting the right product fo...
order in advance
worked perfectly
From R- 38 Attic Kraft faced Fiberglass Batt Insulation 64-sq ft ( 24-in W x 48-in L) Verified Purchaser
Good product
Easy to install. So far works well.
From R- 30 Attic Kraft faced Fiberglass Batt Insulation 58.66-sq ft ( 16-in W x 48-in L) Verified Purchaser
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Thank you for choosing Johns Manville for your project - If you have any additional feedback you'd like to give, please feel free to email us dir...