JM R-21 Unfaced Fiberglass Batt Insulation – 15 in x 105 in, 76.56 sq ft (2x6 Walls)
R-21 Unfaced Fiberglass Wall Batts
JM R-21 unfaced fiberglass batt insulation is designed to improve thermal performance and help reduce unwanted sound transfer in interior wall cavities. Pre-cut batts fit standard 2x6 wood-stud walls and can be added to existing insulation where no vapor retarder is desired.
Key Features:
- Thermal + Sound Control: R-21 performance helps manage heat flow while also supporting sound control in wall cavities
- Unfaced Design: No built-in vapor retarder—ideal for adding to existing insulation or assemblies that require separate vapor control
- Sized for Standard Framing: Pre-cut for 2x6 wood-stud walls with 16-in on-center spacing (15-in wide batts)
- Easy Press-Fit Installation: Designed to press in place between studs for straightforward DIY or pro installs
- Durable Fiberglass: Will not rot, mildew, or deteriorate; noncorrosive to pipes, wiring, and metal components
Specifications Table:
| Specification | Details |
|---|---|
| Insulation Type | Fiberglass |
| R-Value | R-21 |
| R-Value per Inch | 3.8182 |
| Width | 15 in |
| Length | 105 in |
| Thickness | 5.5 in |
| Coverage Area | 76.56 sq ft |
| Faced/Unfaced | Unfaced |
| Vapor Retardant | No |
| Sound Barrier | Yes |
| Stud Spacing | 16 in |
| Fits Wall Framing | 2x6 |
| Framing Type | Wood studs |
| Formaldehyde Free | Yes |
| ENERGY STAR Certified | Yes |
| GREENGUARD Gold Certified | Yes |
| For Use in Walls | Yes |
| For Use in Basements | Yes |
| For Use in Attics | No |
| For Use in Ceilings | No |
| For Use in Floors | No |
| Package Weight | 32.73 lb |
| Package Count | 7 |
| Total Package Quantity | 28 |
| Multi-Pack Quantity | 4 |
| Package Type | Multi-pack |
| Bag Dimensions (L x W x D) | 20 x 20 x 50 |
| Warranty | 1-year limited |
Frequently Asked Questions (FAQ):
Q: What wall cavities does this insulation fit?
A: It’s sized for 2x6 walls with 16-inch on-center stud spacing (15-inch wide batts).
Q: Does this batt include a vapor barrier?
A: No—this is unfaced insulation and does not include a vapor retarder.
Q: Where can it be used?
A: It’s intended for wall applications and is noted for use in basements; it is not listed for attics, ceilings, or floors on the provided spec sheet.
Q: How much area does one package cover?
A: Coverage is listed as 76.56 sq ft per package.
Q: Is it certified for indoor air quality?
A: It’s listed as GREENGUARD Gold Certified and formaldehyde-free in the provided specifications.
Quiet Luxury, Hidden in the Walls
The most elevated spaces are never just about what you see—they’re about how the room feels. These unfaced R-21 fiberglass batts create a calmer, more temperature-stable backdrop, softening noise and supporting energy-smart comfort without changing your visual palette. Designed to slip cleanly into standard 2x6 wall cavities, they’re a discreet upgrade that lets your finishes—and your life—take center stage. It’s the kind of behind-the-scenes essential that makes everyday living feel undeniably luxe.
Upgrade your 2x6 walls with JM R-21 unfaced fiberglass batts for comfort-forward energy savings and better sound control.
Original: $86.83
-70%$86.83
$26.05Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
R-21 Unfaced Fiberglass Wall Batts
JM R-21 unfaced fiberglass batt insulation is designed to improve thermal performance and help reduce unwanted sound transfer in interior wall cavities. Pre-cut batts fit standard 2x6 wood-stud walls and can be added to existing insulation where no vapor retarder is desired.
Key Features:
- Thermal + Sound Control: R-21 performance helps manage heat flow while also supporting sound control in wall cavities
- Unfaced Design: No built-in vapor retarder—ideal for adding to existing insulation or assemblies that require separate vapor control
- Sized for Standard Framing: Pre-cut for 2x6 wood-stud walls with 16-in on-center spacing (15-in wide batts)
- Easy Press-Fit Installation: Designed to press in place between studs for straightforward DIY or pro installs
- Durable Fiberglass: Will not rot, mildew, or deteriorate; noncorrosive to pipes, wiring, and metal components
Specifications Table:
| Specification | Details |
|---|---|
| Insulation Type | Fiberglass |
| R-Value | R-21 |
| R-Value per Inch | 3.8182 |
| Width | 15 in |
| Length | 105 in |
| Thickness | 5.5 in |
| Coverage Area | 76.56 sq ft |
| Faced/Unfaced | Unfaced |
| Vapor Retardant | No |
| Sound Barrier | Yes |
| Stud Spacing | 16 in |
| Fits Wall Framing | 2x6 |
| Framing Type | Wood studs |
| Formaldehyde Free | Yes |
| ENERGY STAR Certified | Yes |
| GREENGUARD Gold Certified | Yes |
| For Use in Walls | Yes |
| For Use in Basements | Yes |
| For Use in Attics | No |
| For Use in Ceilings | No |
| For Use in Floors | No |
| Package Weight | 32.73 lb |
| Package Count | 7 |
| Total Package Quantity | 28 |
| Multi-Pack Quantity | 4 |
| Package Type | Multi-pack |
| Bag Dimensions (L x W x D) | 20 x 20 x 50 |
| Warranty | 1-year limited |
Frequently Asked Questions (FAQ):
Q: What wall cavities does this insulation fit?
A: It’s sized for 2x6 walls with 16-inch on-center stud spacing (15-inch wide batts).
Q: Does this batt include a vapor barrier?
A: No—this is unfaced insulation and does not include a vapor retarder.
Q: Where can it be used?
A: It’s intended for wall applications and is noted for use in basements; it is not listed for attics, ceilings, or floors on the provided spec sheet.
Q: How much area does one package cover?
A: Coverage is listed as 76.56 sq ft per package.
Q: Is it certified for indoor air quality?
A: It’s listed as GREENGUARD Gold Certified and formaldehyde-free in the provided specifications.
Quiet Luxury, Hidden in the Walls
The most elevated spaces are never just about what you see—they’re about how the room feels. These unfaced R-21 fiberglass batts create a calmer, more temperature-stable backdrop, softening noise and supporting energy-smart comfort without changing your visual palette. Designed to slip cleanly into standard 2x6 wall cavities, they’re a discreet upgrade that lets your finishes—and your life—take center stage. It’s the kind of behind-the-scenes essential that makes everyday living feel undeniably luxe.
Upgrade your 2x6 walls with JM R-21 unfaced fiberglass batts for comfort-forward energy savings and better sound control.
