CurtainBoard - PowerWool

Why Use CurtainBoard?

PowerWool CurtainBoard™ – the premier choice for curtain wall and perimeter containment systems.

PowerWool™ CurtainBoard™ is a rigid mineral wool insulation board designed for perimeter fire containment applications in spandrel panels and mullion covers. Engineered for high-rise and commercial curtain wall systems, CurtainBoard™ provides noncombustible fire resistance, moisture resilience, and long-term dimensional stability.

Key Performance Benefits

Noncombustible and fire resistant
Moisture repellent, maintaining long-term thermal performance
Dimensional stability, resistant to expansion or contraction due to temperature changes
Durable, inorganic material that does not support mold, mildew, or decay
Available unfaced or with reinforced foil facing (RFF) for system compatibility

Why Choose Mineral Wool Insulation

Mineral wool provides a combination of fire resistance, durability, and stability that makes it ideal for perimeter fire containment and curtain wall applications:
Noncombustible, helping contain fire and prevent spread within building assemblies
Dimensionally stable, resisting movement from thermal or moisture variations
Inorganic and durable, it does not rot or support microbial growth
Compatible with high-rise unitized and stick-built curtain wall systems

CHARACTERISTIC

RESULT

TEST STANDARD

Compliance

Mineral Fiber Block and Board Thermal Insulation – Compliant
Mineral Fiber Thermal Insulation for Buildings – Compliant

ASTM C612
CAN/ULC S702.1

Reaction to Fire

Flame spread index = 0; Smoke developed index = 0
Flame spread index = 0; Smoke developed index = 0
Determination of Non Combustability of Building Materials – Non Combustible
Behaviour of materials at 750°C – Non Combustible

ASTM E84 (UL 723)
CAN/ULC S102
CAN/ULC S114
ASTM E136

Density

8 lbs/ft³ (128 kg/m³) – Nominal

ASTM C303

Dimensional Stability

Linear Shrinkage = Pass @1200°F (650°C)

ASTM C356

Corrosion Resistance

Corrosion of Steel – Passed

ASTM C665

Thermal Resistance

R-Value / inch @ 75°F — 4.2 hr.ft².F/Btu
RSI value / 25.4 mm @ 24°C — 0.74 m²K/W

ASTM C518

Reaction to Moisture

Moisture Sorption – Pass
Water Vapor Transmission, Desiccant Method – 1670ng/Pa.s.m² (29 perm)
Determination of Fungi Resistance – Passed

ASTM C1104
ASTM E96
ASTM C1338

Dimensions

1½” (38 mm) to 6″ (152.4 mm) in ½” increments
16″ × 48″ (406 mm × 1219 mm)
24″ × 48″ (610 mm × 1219 mm)

Acoustic Performance

	125Hz	250Hz	500Hz	1000Hz	2000Hz	4000Hz	NRC	SAA
1.5″	0.09	0.47	0.97	1.04	0.99	0.98	0.85	0.88
2″	0.26	0.88	1.12	1.06	0.99	1.00	1.00	1.01
2.5″	0.39	1.06	1.15	1.06	1.02	1.07	1.05	1.06
3″	0.57	1.12	1.14	1.03	1.02	1.02	1.10	1.07
4″	0.76	1.13	1.09	1.03	1.01	1.04	1.05	1.06