JM Johns Manville R-19 FSK Faced Fiberglass Batt Insulation 24 in x 48 in x 6-1/2 in (144 sq-ft)
R-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.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
R-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.
