At a Glance
R-Value per Inch: 4.2
Stud Spacing: 16 (in)
Sound BarrierROCKWOOL Comfortbatt R- 15.0 Attic Wall Unfaced Stone wool Batt Insulation 59.7-sq ft ( 15.25-in W x 47.0-in L)
Item #138683 |
Model #RXCB351525
Flexible edge is designed to compress then expand into the stud cavity to maximize thermal performance
Easy and efficient installation, use a serrated knife to quickly cut around obstructions and penetrations
Friction fit into the stud cavity to ensure optimum performance, no sag over the years
Noncombustible, fire-resistant with a melting point above 1000 degrees Celcius
Water-resistant material repels water providing durability to unexpected exposure to moisture
Excellent sound absorbency with a high density fiber distribution
Made from one of the world’s most abundant raw materials - stone wool is user friendly
GREENGUARD Gold certified; chemically inert - CFC and HCFC free product and process
Inorganic, does not promote the growth of fungi, mold or mildew
General | |||
|---|---|---|---|
Series Name | Comfortbatt | Insulation Type | Stone wool |
Package Type | Individual pack | Package Count | 12 |
Total Package Quantity | 1 | Framing Type | Wood studs |
Dimensions | |||
|---|---|---|---|
Bag Dimensions (L x W x D) | 24 x 48 x 16 | Thickness (Inches) | 3.5 |
Coverage Area (Sq. Feet) | 59.7 | Width (Inches) | 15.25 |
Length (Inches) | 47 | R-Value per Inch | 4.2 |
Package Weight (lbs.) | 49.72 | Maximum R-Value | 15 |
Features | |||
|---|---|---|---|
Faced/Unfaced | Unfaced | Stud Spacing (Inches) | 16 |
Formaldehyde Free | No | Vapor Retardant | No |
Sound Barrier | Yes | ||
Certifications | |||
|---|---|---|---|
CA Residents: Prop 65 Warning(s) | No | GREENGUARD Gold Certified | Yes |
ENERGY STAR Certified | Yes | ||
Warranty | |||
|---|---|---|---|
Warranty | None | ||
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 | 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 | Yes |
For Use in Duct | No | For Use in Windows | No |
For Use in Electrical | No | Fits 2 x 4 Walls | Yes |
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
This insulation product is praised for its excellent insulating properties, providing effective temperature regulation and noise reduction. It is easy to install, cutting cleanly and fitting snugly without additional supports. Customers find it less irritating to handle compared to traditional fiberglass insulation. The product is also highly durable, resistant to moisture, mold, and fire, offering added safety and longevity.
Customer review summary generated by AI, including incentivized reviews.Do not compress the insulation.
I thought that the Rock Wool was very easy to work with and caused no discomfort like fiberglass does
Verified Purchaser
Better than fiberglass
Easy to use, breaks easily so use caution trying to stuff it in small spaces
Verified Purchaser
Great insulation
The item held together well during install and provides great noise barrier.
Verified Purchaser
Blah blah
I didn’t like how soft it was
Verified Purchaser
Very good
Exactly what it should do
Verified Purchaser
Easy to install and works well
Easy to install, better than fiberglass batts
Verified Purchaser
Missing product no refund
I ordered 14 of these and they only delivered 2 in March 2025 and they have NOT returned my money and I have not received my product. They even show that only two were put on the delivery truck and still will not refund my money.
Best on the market
So easy to work with!
Verified Purchaser
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