Knauf Insulation R-6.5 Acoustical Unfaced Insulation Board, 1-1/2 in x 24 in x 48 in, 8-PackR 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

R-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.

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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

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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

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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.

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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.

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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.

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Q: What is the density?
A: 3 pounds per cubic foot (3 pcf).

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Q: What temperature can it withstand?
A: Rated for service temperatures up to 1000°F per manufacturer specifications.

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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.

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Upgrade your project’s comfort and clarity—add this R-6.5 acoustical fiberglass board 8-pack to your cart today.