Johns Manville JM R-13 FSK Faced Fiberglass Batt Insulation, 24 in x 96 in (176 sq ft)
Regular price $99.42R-13 FSK Faced Fiberglass Batt Insulation (24" x 96")
Johns Manville R-13 fiberglass batt insulation with FSK (foil-scrim-kraft) facing helps improve thermal and acoustical performance while adding a vapor retarder. The flame-resistant facing is rated 25/50 or less per ASTM E84 where codes permit, making it a strong choice for steel-stud framing and a wide range of wall and ceiling applications.
Key Features:
- FSK-25 Vapor Retarder Facing: Foil-scrim-kraft facing adds vapor control and a clean, light-reflective surface.
- Fire Performance Rated: Designed to meet 25/50 or less per ASTM E84 for flame spread/smoke developed where codes permit.
- Thermal + Sound Control: Helps resist heat transfer and reduces sound transmission through walls, floors, and ceilings.
- Formaldehyde-Free Fiberglass: Will not off-gas formaldehyde in the indoor environment.
- Durable, Dimensionally Stable Batts: Inorganic glass fibers resist rot/mildew and are designed not to slump or settle in cavities.
Specifications Table:
| Specification | Details |
|---|---|
| R-Value | R-13 |
| Coverage | 176 sq-ft |
| Width | 24 in |
| Length | 96 in |
| Thickness | 3-1/2 in |
| Material | Fiberglass |
| 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 |
| Special Features | Reinforced; Flame Resistant |
| Water Vapor Permeability | 0.05 perm-in |
| Water Vapor Sorption | <5 % |
| Standards/Certifications | ASTM C665 Type III Class A Category I; Energy Star Certified; IBC; Indoor Air Quality Certified; NAIMA 16 CFR Part 460; Recycled Content Certified |
| Manufacturer Part # | FSK495 |
Frequently Asked Questions (FAQ):
Q: What does “FSK faced” mean?
A: FSK is a foil-scrim-kraft facing laminated to the fiberglass batt; it can act as a vapor retarder and helps the product achieve a fire-hazard classification of 25/50 or less per ASTM E84 (where codes permit).
Q: Where can this batt insulation be used?
A: It’s listed for a wide variety of wood frame, engineered wood, and steel frame construction, and is noted for use with steel stud framing.
Q: What are the key fire-rating properties?
A: The product lists a flame spread index of <25 and a smoke developed index of <50.
Q: What are the batt dimensions and thickness?
A: Each batt is 24 in wide x 96 in long and 3-1/2 in thick, with an R-value of 13.
Q: Does it help with moisture control?
A: The facing serves as an excellent vapor retarder, with listed water vapor permeability of 0.05 perm-in and water vapor sorption of <5%.
A clean, light-catching layer that quietly elevates comfort
There’s a refined practicality to an FSK-faced batt—the crisp foil surface feels almost architectural, bringing a subtle, light-reflective order to the unseen layers of a room. With R-13 performance and an integrated vapor retarder, it helps shape interiors that feel calmer, warmer, and acoustically composed. Use it behind walls and ceilings where you want comfort to read as effortless—especially in metal-stud builds that demand precision. It’s the kind of foundational detail that makes luxury feel inevitable.
Upgrade your wall or ceiling assembly with JM R-13 FSK faced batts for efficient comfort, sound control, and a built-in vapor retarder.
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