JM Johns Manville R-19 FSK Faced Fiberglass Batt Insulation 24 in x 48 in x 6-1/2 in (144 sq-ft)
Regular price $94.14R-19 FSK Faced Fiberglass Batt Insulation
JM (Johns Manville) R-19 fiberglass batt insulation with FSK (foil-scrim-kraft) facing helps reduce heat transfer while also providing a vapor retarder for framed wall and ceiling assemblies. The flame-resistant facing supports a 25/50 or less fire-hazard classification per ASTM E84 where codes permit exposed installation.
Key Features:
- FSK Vapor-Retarder Facing: Foil-scrim-kraft (FSK-25) facing helps control moisture while improving durability.
- Thermal + Acoustic Performance: R-19 thermal resistance helps limit heat transfer and can reduce sound transmission through assemblies.
- Fire-Resistant Construction: Designed to meet 25/50 or less fire-hazard classification per ASTM E84 when applicable.
- Formaldehyde-Free Fiberglass: Made to avoid off-gassing formaldehyde in indoor environments.
- Durable, Non-Corrosive Fibers: Inorganic glass fibers resist rot and mildew and won’t corrode pipes, wiring, or metal studs.
Specifications Table:
| Specification | Details |
|---|---|
| Category | Batt Insulation |
| Material | Fiberglass |
| Manufacturer | Johns Manville |
| DI part # | 031979110063 |
| Manufacturer part # | FSK444 |
| Application | For Wide Variety of Wood Frame, Engineered Wood and Steel Frame Construction |
| Facing type | FSK-25 |
| Flame spread index | <25 |
| For use with | Steel Stud Framing |
| Insulation thickness | 6-1/2 in |
| Item name | Building and Residential Fiberglass |
| Length | 48 in |
| Width | 24 in |
| R-value | 19 |
| Coverage | 144 sq-ft |
| 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 |
Frequently Asked Questions (FAQ):
Q: What does FSK-faced mean?
A: FSK stands for foil-scrim-kraft; this product uses an FSK-25 facing that also serves as a vapor retarder.
Q: What framing types is this batt intended for?
A: It is listed for use with steel stud framing and a wide variety of wood frame, engineered wood, and steel frame construction.
Q: What are the fire/smoke ratings?
A: Flame spread index is listed as <25 and smoke developed index as <50.
Q: What area does this package cover?
A: The product listing indicates 144 sq-ft coverage.
A Clean, Reflective Layer of Comfort Behind the Walls
Think of this FSK-faced batt as the quiet luxury you don’t see—but feel. The crisp foil facing reads like a tailored finish behind the scenes, pairing thermal efficiency with a smart vapor-retarder layer. Use it to refine envelopes in basements, exterior walls, or ceilings where performance and polish matter. It’s the kind of foundational upgrade that makes a home feel effortlessly more elevated.
Upgrade your build with JM R-19 FSK-faced fiberglass batts for dependable thermal comfort, sound control, and vapor-retarder performance.
All third party trademarks, including logos and icons, referenced on our website and product pages remain the property of their respective owners. Unless specifically identified as such, Arbor's use of third party trademarks does not indicate any relationship, affiliation, sponsorship, or endorsement between Arbor Home and the owners of these trademarks. Any references by Arbor Home to third party trademarks are to identify the corresponding third party goods.
