Johns Manville R-38 Attic Unfaced Fiberglass Batt Insulation, 63.33-sq ft Coverage (23.75-in W x 48-in L) - U1348S
R-38 Unfaced Fiberglass Batt Insulation for Attics
Formaledehyde-free fiberglass batts deliver R-38 thermal performance for attics and cathedral ceilings. Pre-cut 48-in lengths fit 24-in on-center framing and provide 63.33 sq ft of coverage per pack.
Key Features:
- High R-Value Performance: R-38 insulation boosts energy efficiency and comfort
- Unfaced Design: No vapor barrier—ideal for adding over existing insulation
- Pre-Cut Convenience: 48-in batts sized for 23.75-in width cavities with 24-in stud spacing
- Durable Fiberglass: Will not rot, mildew, or corrode pipes, wiring, or metal studs
- Low Emissions Certifications: GREENGUARD Gold and SCS Recycled Content certified
Specifications Table:
| Specification | Details |
|---|---|
| Coverage Area (Sq. Feet) | 63.33 |
| Length (Inches) | 48 |
| Width (Inches) | 23.75 |
| Thickness (Inches) | 12 |
| Faced/Unfaced | Unfaced |
| Framing Type | Wood studs |
| Insulation Type | Fiberglass |
| Maximum R-Value | 38 |
| R-Value per Inch | 3.1667 |
| Stud Spacing (Inches) | 24 |
| For Use in Attics | Yes |
| For Use in Ceilings | Yes |
| For Use in Walls | No |
| For Use in Floors | No |
| For Use in Basements | No |
| For Use in Crawlspaces | No |
| For Use in Doors | No |
| For Use in Duct | No |
| For Use in Electrical | No |
| For Use in Garage Doors | No |
| For Use in Masonry | No |
| For Use in Plumbing | No |
| For Use in Vents | No |
| For Use in Windows | No |
| Formaldehyde Free | Yes |
| Sound Barrier | Yes |
| Vapor Retardant | No |
| ENERGY STAR Certified | Yes |
| GREENGUARD Gold Certified | Yes |
| Warranty | 1-year limited |
| Bag Dimensions (L x W x D) | 24.3 x 20 x 50 |
| Package Weight (lbs.) | 45.68 |
| Package Type | Multi-pack |
| Package Count | 8 |
| Multi-Pack Quantity | 4 |
| Total Package Quantity | 32 |
| UNSPSC | 11162400 |
Frequently Asked Questions (FAQ):
Q: How much area does one pack cover?
A: Each pack provides 63.33 square feet of coverage.
Q: Can I install this over existing insulation?
A: Yes, the unfaced batts can be laid over existing attic insulation where a vapor barrier is not needed.
Q: What framing spacing is this sized for?
A: These batts are designed for 24-in on-center framing with a 23.75-in cavity width.
Q: Is the product formaldehyde-free?
A: Yes, it is formaldehyde-free and GREENGUARD Gold certified for indoor air quality.
Q: Where can it be used?
A: Primarily for attics and cathedral ceilings; not intended for walls or crawlspaces.
Quiet, Cozy Attics with Effortless Elegance
This R-38 batt brings a serene hush and steady comfort to upper levels, wrapping your home in a clean, minimalist layer. The slim profile is tailored for cathedral ceilings, creating a refined envelope without bulk. Pair it with soft, natural finishes—think pale woods and matte paints—to amplify its calm energy efficiency. Consider it a foundational luxury: invisible, indispensable, and beautifully effective.
Upgrade your attic with R-38 performance and start saving on energy costs today.
Original: $146.11
-70%$146.11
$43.83Product Information
Product Information
Shipping & Returns
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Description
R-38 Unfaced Fiberglass Batt Insulation for Attics
Formaledehyde-free fiberglass batts deliver R-38 thermal performance for attics and cathedral ceilings. Pre-cut 48-in lengths fit 24-in on-center framing and provide 63.33 sq ft of coverage per pack.
Key Features:
- High R-Value Performance: R-38 insulation boosts energy efficiency and comfort
- Unfaced Design: No vapor barrier—ideal for adding over existing insulation
- Pre-Cut Convenience: 48-in batts sized for 23.75-in width cavities with 24-in stud spacing
- Durable Fiberglass: Will not rot, mildew, or corrode pipes, wiring, or metal studs
- Low Emissions Certifications: GREENGUARD Gold and SCS Recycled Content certified
Specifications Table:
| Specification | Details |
|---|---|
| Coverage Area (Sq. Feet) | 63.33 |
| Length (Inches) | 48 |
| Width (Inches) | 23.75 |
| Thickness (Inches) | 12 |
| Faced/Unfaced | Unfaced |
| Framing Type | Wood studs |
| Insulation Type | Fiberglass |
| Maximum R-Value | 38 |
| R-Value per Inch | 3.1667 |
| Stud Spacing (Inches) | 24 |
| For Use in Attics | Yes |
| For Use in Ceilings | Yes |
| For Use in Walls | No |
| For Use in Floors | No |
| For Use in Basements | No |
| For Use in Crawlspaces | No |
| For Use in Doors | No |
| For Use in Duct | No |
| For Use in Electrical | No |
| For Use in Garage Doors | No |
| For Use in Masonry | No |
| For Use in Plumbing | No |
| For Use in Vents | No |
| For Use in Windows | No |
| Formaldehyde Free | Yes |
| Sound Barrier | Yes |
| Vapor Retardant | No |
| ENERGY STAR Certified | Yes |
| GREENGUARD Gold Certified | Yes |
| Warranty | 1-year limited |
| Bag Dimensions (L x W x D) | 24.3 x 20 x 50 |
| Package Weight (lbs.) | 45.68 |
| Package Type | Multi-pack |
| Package Count | 8 |
| Multi-Pack Quantity | 4 |
| Total Package Quantity | 32 |
| UNSPSC | 11162400 |
Frequently Asked Questions (FAQ):
Q: How much area does one pack cover?
A: Each pack provides 63.33 square feet of coverage.
Q: Can I install this over existing insulation?
A: Yes, the unfaced batts can be laid over existing attic insulation where a vapor barrier is not needed.
Q: What framing spacing is this sized for?
A: These batts are designed for 24-in on-center framing with a 23.75-in cavity width.
Q: Is the product formaldehyde-free?
A: Yes, it is formaldehyde-free and GREENGUARD Gold certified for indoor air quality.
Q: Where can it be used?
A: Primarily for attics and cathedral ceilings; not intended for walls or crawlspaces.
Quiet, Cozy Attics with Effortless Elegance
This R-38 batt brings a serene hush and steady comfort to upper levels, wrapping your home in a clean, minimalist layer. The slim profile is tailored for cathedral ceilings, creating a refined envelope without bulk. Pair it with soft, natural finishes—think pale woods and matte paints—to amplify its calm energy efficiency. Consider it a foundational luxury: invisible, indispensable, and beautifully effective.
Upgrade your attic with R-38 performance and start saving on energy costs today.
