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CURTAINROCK® is a lightweight, semi-rigid stone wool insulation board designed specifically for use in curtain wall systems; suited for backpan or mechanical fastening applications. ROXUL offers CURTAINROCK®, CURTAINROCK® 40, and CURTAINROCK® 80 to meet a wide variety of curtain wall specifications. CURTAINROCK® 40/80 together with ROXUL SAFE™ provides a comprehensive critical line of defense in fire protection that has been UL/ULC tested and approved for perimeter fire containment.

  • Low moisture sorption rate; effectively drains water away from exterior walls
  • Delivers higher R-values for lasting thermal protection
  • Non-combustible product with a melting point of approximately 2150°F (1177°C)
  • Sound absorbent
  • Chemically inert; non-corrosive
  • Repels water, does not rot, or promote the growth of mildew, fungi, or bacteria
  • Can be fabricated and faced with reinforced foil facings
  • Approved for use as a component of UL-approved systems
  • ROXUL can contribute to earning LEED® points
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Technical Information

Property Test Standard Performance
Compliance ASTM C612 Mineral Fiber Block and Board Thermal Insulation - Type IVA Compliant
Reaction to Fire ASTM E84 (UL 723) Flame spread index = 0 ; Smoke developed index = 0
Reaction to Fire CAN/ULC S102 Flame spread index = 0 ; Smoke developed index = 0
Reaction to Fire CAN/ULC S114 Determination of Non Combustibility of Building Materials - Non Combustible
Reaction to Fire ASTM E136 Test for Non-Combustibility - Non Combustible
Reaction to Fire ASTM C411 Hot Surface Performance - 1200°F
Density ASTM C303 Actual Density - 3.5 lbs/ft³ (56 kgs/m³)
Dimensional Stability ASTM C356 Linear Shrinkage - < 2 % @ 1200°F
Corrosion Resistance ASTM C795 Stress Corrosion Cracking Tendency of Austenitic Stainless Steel - Passed
Corrosion Resistance ASTM C665 Corrosion of Steel - Passed
Thermal Resistance ASTM C518 (C177) R-Value / inch @ 75oF 4.2 hr.ft2.F/Btu
Thermal Resistance ASTM C518 (C177) RSI value / 25.4mm @ 24oC 0.74 m2K/W
Reaction to Moisture ASTM C1104 Moisture Sorption - 0.01%
Reaction to Moisture ASTM E96 Water Vapor Transmission, Desiccant Method - 1805ng/Pa.s.m2 (32 perm)
Reaction to Moisture ASTM C1338 Determination of Fungi Resistance - Passed
Thickness Product is available in 1” through 5” offerings (25.4mm - 127mm)
Dimensions 24"x48" (610mm x 1219mm)
Acoustical Performance ASTM C423
Thickness 125 Hz 250 Hz 500 Hz 1000 Hz 2000Hz 4000 Hz NRC
2" 0.26 0.68 1.12 1.1 1.03 1.04 1
3" 0.63 0.95 1.14 1.01 1.03 1.04 1.05
4" 1.03 1.07 1.12 1.04 1.07 1.08 1.1
UL Listings
UL Listings

UL Listings

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