JM (Johns Manville) R-19 FSK Faced Fiberglass Batt Insulation, 16 in x 48 in, 6-1/2 in Thick (96 sq-ft)
Regular price $119.19R-19 FSK Faced Fiberglass Batt Insulation (16 in x 48 in)
JM (Johns Manville) R-19 FSK-faced fiberglass batt insulation provides thermal and acoustical performance for wood, engineered wood, and steel frame construction. The foil-scrim-kraft (FSK-25) facing adds a vapor retarder and supports a 25/50 or less fire hazard classification where codes permit exposed installation.
Key Features:
- Vapor Retarder Facing: FSK-25 foil-scrim-kraft facing helps control moisture and may be left exposed where codes permit
- Thermal Performance: R-19 insulation helps resist heat transfer to improve energy efficiency
- Fire & Smoke Performance: Rated to ASTM E84 25/50 or less (flame spread <25; smoke developed <50)
- Sound Control: Fiberglass batts help reduce sound transmission through wall, floor, and ceiling assemblies
- Durable Fiberglass Construction: Inorganic glass fibers resist rot and mildew and won’t slump or settle under normal conditions
Specifications Table:
| Specification | Details |
|---|---|
| Brand | JM |
| Manufacturer | Johns Manville |
| Category | Batt Insulation |
| Material | Fiberglass |
| R-Value | R-19 |
| Width | 16 in |
| Length | 48 in |
| Insulation Thickness | 6-1/2 in |
| Facing Type | FSK-25 |
| Application | For wide variety of wood frame, engineered wood and steel frame construction |
| For Use With | Steel stud framing |
| Flame Spread Index | <25 |
| Smoke Developed Index | <50 |
| Water Vapor Permeability | 0.05 perm-in |
| Water Vapor Sorption | <5 % |
| Special Features | Reinforced; Flame resistant |
| Certifications/Standards | ASTM C665 Type III Class A Category I; Energy Star Certified; IBC; Indoor Air Quality Certified; NAIMA 16 CFR Part 460; Recycled Content Certified |
| Coverage | 96 sq-ft |
| Manufacturer Part Number | FSK443 |
Frequently Asked Questions (FAQ):
Q: What wall cavity is this batt designed for?
A: It’s 6-1/2 in thick and commonly used in 2x6 wall cavities, including steel stud framing.
Q: Does the facing act as a vapor barrier/retarder?
A: Yes. The FSK-25 facing serves as an excellent vapor retarder.
Q: Can the foil facing be left exposed?
A: It may be left exposed where local building codes permit.
Q: What are the fire/smoke ratings?
A: It carries a 25/50 or less fire hazard classification per ASTM E84; flame spread index <25 and smoke developed index <50.
Q: What framing types and applications is it intended for?
A: Designed for a wide variety of wood frame, engineered wood, and steel frame construction, including retrofit and new construction.
Quiet luxury, engineered into the walls
This R-19 FSK-faced batt is the kind of behind-the-scenes upgrade that makes a home feel unmistakably refined—more comfortable, calmer, and beautifully controlled. The crisp, light-reflective foil facing adds a clean, architectural finish while quietly working as a vapor retarder. Use it in stud bays where you want performance without visual noise, especially in spaces where acoustics matter—bedrooms, studios, or media rooms. It’s practical, polished, and foundational to elevated everyday living.
Upgrade your wall or floor cavities with JM R-19 FSK-faced batts for efficient comfort, sound control, and code-friendly vapor resistance.
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