Knauf Insulation R-6.5 Acoustical Unfaced Insulation Board, 1-1/2 in x 24 in x 48 in, 8-Pack
Regular price $125.99R-6.5 Acoustical Unfaced Fiberglass Board, 1-1/2 x 24 x 48, 8-Pack
High-performance unfaced fiberglass board designed for acoustical and thermal control. The 1-1/2 in thick Earthwool board delivers R-6.5 insulation with lightweight handling, ideal for ductwork, equipment, and wall assemblies.
Key Features:
- Acoustic + Thermal Control: R-6.5 unfaced fiberglass board reduces noise and heat transfer
- Easy to Work With: Lightweight, cuts and fits easily for faster installation
- Durable Performance: 3 pcf density resists sagging and maintains form in panels and ducts
- High Temperature Rating: Suitable for applications up to 1000°F (per manufacturer data)
- Healthy Indoor Air: Low-emitting material with GREENGUARD Gold certification noted by manufacturer
Specifications Table:
| Specification | Details |
|---|---|
| Insulation Type | Fiberglass board (unfaced) |
| R-Value | R-6.5 |
| Thickness | 1-1/2 in |
| Width | 24 in |
| Length | 48 in |
| Density | 3 pcf |
| Temperature Rating | Up to 1000°F |
| Thermal Conductivity | 0.23 to 0.37 Btu-in/hr-sq-ft-°F |
| Water Vapor Permeability | 0.02 perm-in |
| Water Vapor Sorption | <5% |
| Flame Spread Index | 25 |
| Smoke Developed Index | 50 |
| Standards/Certifications | ASTM C1136; ASTM C553 Type I II III; ASTM C612 Type IA IB; ASTM C795; California Title 24; GREENGUARD Gold; MIL-I-24244; NFPA 90A; NFPA 90B; NRC Guide 1.36; UL Listed; ULC Listed; US Federal Specification HH-B-100B; US Federal Specification HH-I-558C |
| Sub-Brand | Earthwool |
| Manufacturer | Knauf Insulation |
| Applications | Thermal and acoustical treatment for HVAC ducts, power/process equipment, boiler and stack installations, metal and masonry walls, wall/roof panel systems, curtain wall assemblies, cavity walls, hot service applications |
Frequently Asked Questions (FAQ):
Q: Is this board faced or unfaced?
A: Unfaced—ideal when a vapor retarder is not required or when a separate facing will be applied.
Q: What are the board dimensions and R-value?
A: Each board is 1-1/2 in thick by 24 in wide by 48 in long with an R-value of 6.5.
Q: Can it be used for HVAC ducts?
A: Yes. It’s commonly used for thermal and acoustical treatment of HVAC ducts and equipment housings.
Q: What is the density?
A: 3 pounds per cubic foot (3 pcf).
Q: What temperature can it withstand?
A: Rated for service temperatures up to 1000°F per manufacturer specifications.
Quiet Confidence in Earth-Toned Texture
This acoustical board hushes a room with a refined, earthy presence, turning functional insulation into a discreet design ally. Its dense, unfaced profile slips behind panels or inside soffits, elevating sound quality while preserving clean lines. Wrap it in perforated metal or fabric for a bespoke wall feature that balances warmth and precision. It’s an elegant essential for spaces that demand serene, luxurious acoustics.
Upgrade your project’s comfort and clarity—add this R-6.5 acoustical fiberglass board 8-pack to your cart today.
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