R-38 kraft-faced fiberglass batt insulation
Johns Manville R-38 faced fiberglass batt insulation is designed for wood-framed attics and ceilings to help reduce heat loss and improve comfort. The kraft/FSK facing provides a built-in vapor retarder for moisture control, and the batts are pre-cut to fit standard 16 in. on-center framing.
Key Features:
- High Thermal Performance: R-38 batt helps improve energy efficiency in attics and ceilings.
- Built-In Vapor Retarder: Faced insulation provides moisture control when installed correctly.
- Sized for Standard Framing: 16 in x 48 in batts are pre-cut for typical 16 in. on-center spacing.
- Sound Dampening Benefit: Fiberglass helps reduce sound transmission for quieter living spaces.
- Formaldehyde-Free Fiberglass: Made with Formaldehyde-free insulation for indoor comfort considerations.
Please check the Product Data Sheet Here
Specifications Table:
| Specification | Details |
| R-Value | R-38 |
| Insulation Material/Type | Fiberglass batt |
| Facing | Faced (kraft/FSK faced) |
| Batt Width | 16 in |
| Batt Length | 48 in (4 ft) |
| Coverage Area per Bag | 42.66 sq ft |
| Coverage Area (rounded) | 43 sq ft |
| Pack Size | 1 bag |
| Pieces per Bag | 8 |
| Insulation Location | Attic; ceiling |
| Insulation Features | Friction fit; soundproofing insulation; vapor retardant |
| Compatible Install Surface | Concrete; copper pipes; existing drywall; existing insulation; fiberglass; metal; PVC/CPVC pipes; PEX pipes; plywood; tile flooring; wood |
| Bag Size | 3.93 ft x 16 in x 16 in |
Frequently Asked Questions (FAQ):
Q: Where can this R-38 batt be used?
A: It is intended for wood-framed attics and ceilings (and is also commonly used in other framing cavities where R-38 batts are appropriate).
Q: What does faced mean on this insulation?
A: The facing acts as a vapor retarder to help with moisture control when installed per local code and manufacturer instructions.
Q: What framing size does this fit?
A: The batts are 16 in. wide and designed for standard 16 in. on-center framing.
Q: How much area does one bag cover?
A: One bag covers about 42.66 sq ft (often rounded to 43 sq ft).
Q: How is it typically installed?
A: Batts are placed between joists/cavities; some faced batts can be stapled via the facing tabs if needed for securement (follow the installation guide and local code).
Quiet Luxury Starts Behind the Walls
Theres a special kind of elegance in a home that feels perfectly temperedcool when its blazing, warm when its crisp, and serene all year long. This R-38 faced fiberglass batt brings that layered comfort with a clean, tailored fit for standard framing, plus a built-in vapor retarder to support a well-composed envelope. Use it to refine attic and ceiling zones so the rooms below feel calmer, quieter, and more intentional. Its the kind of invisible upgrade that makes everyday living feel unmistakably elevated.
Upgrade your attic or ceiling today with Johns Manville R-38 faced batts for efficient comfort and added moisture control.
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