Johns Manville R-49 Kraft-Faced Fiberglass Batt Insulation, 48 sq ft Coverage, 24 in x 48 in (K4924S)
Regular price $105.87R-49 Kraft-Faced Fiberglass Batt Insulation, 24 in x 48 in
High-R R-49 kraft-faced fiberglass batts deliver powerful thermal performance and sound control for attics, ceilings, and floors. Precut to 24 in x 48 in for 24 in on-center joists, they include an integral vapor retarder for moisture management and are formaldehyde-free.
Key Features:
- High Thermal Performance: R-49 batts boost energy efficiency in attics, ceilings and floors
- Built-In Vapor Retarder: Kraft facing helps control moisture and can be stapled for secure installation
- Easy to Install: Precut 24 in x 48 in batts fit 24 in on-center joists; press in place and staple tabs as needed
- Health & Sustainability: Formaldehyde-free fiberglass with GREENGUARD Gold and SCS certifications
- Durable and Noncorrosive: Will not rot, mildew or deteriorate; safe for pipes, wiring and metal studs
Specifications Table:
| Specification | Details |
|---|---|
| Coverage Area | 48 sq ft |
| Dimensions (Each Batt) | 24 in W x 48 in L |
| Thickness | 13.5 in |
| Stud/Joist Spacing | 24 in on-center |
| Faced/Unfaced | Kraft faced |
| Insulation Type | Fiberglass |
| Maximum R-Value | R-49 |
| R-Value per Inch | 3.63 |
| For Use in Attics | Yes |
| For Use in Ceilings | Yes |
| For Use in Floors | Yes |
| For Use in Walls | No |
| Formaldehyde Free | Yes |
| Vapor Retardant | Yes |
| Sound Barrier | Yes |
| ENERGY STAR Certified | Yes (program partner) |
| GREENGUARD Gold Certified | Yes |
| Warranty | 1-year limited |
| Bag Dimensions (L x W x D) | 24.5 in x 20 in x 49 in |
| Package Weight | 40.24 lb |
| Package Type | Multi-pack |
| Package Count | 6 |
| Multi-Pack Quantity | 4 |
| Total Package Quantity | 24 |
| UNSPSC | 11162400 |
Frequently Asked Questions (FAQ):
Q: How much area does this package cover?
A: One package covers 48 square feet with 24 in x 48 in batts.
Q: Where can I use these batts?
A: Designed for attics, ceilings, and floors with 24 in on-center spacing; not intended for walls or crawlspaces.
Q: Do I need a separate vapor barrier?
A: No—these are kraft-faced batts that include a built-in vapor retarder.
Q: Are the batts formaldehyde-free?
A: Yes, they are formaldehyde-free and GREENGUARD Gold certified.
Q: What tools are recommended for installation?
A: Use gloves, eye protection, long sleeves, a utility knife, caulk or spray foam for sealing, and an attic ruler.
Quiet, cozy comfort with architectural intention
This high-R insulation quiets the home like a luxury retreat, wrapping rooms in calm while elevating energy elegance. The kraft facing offers a clean, tailored finish that nestles neatly between joists. Pair it with soft, layered textiles and warm woods to underscore the serene hush it creates. It’s a discreet essential that delivers the refined comfort of truly luxurious living.
Upgrade your attic with R-49 performance today and enjoy a quieter, more energy-efficient home year-round.
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