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FABROCK™ DD is a dual density board insulation that is designed to be fabricated while maintaining its integrity. A high density layer and a lower density layer work together to give the product compressive resistance and excellent sound absorbency. Ideal for use in acoustic panels but not limited to this application, dual density insulation has many uses in different OEM applications. As with all ROXUL products, it has excellent fire and thermal properties, is dimensionally stable, vapor permeable and will not encourage the growth of mold.


  • Non-combustible stone wool insulation with melting point of approx. 1177°C (2150°F)
  • Does not promote smoke or flame spread when exposed to flame
  • Denser composition provides excellent sound control
  • Outstanding thermal resistance
  • Dimensionally stable Water and moisture resistant
  • Does not promote growth of fungi or mildew
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Technical Information

Property Test Standard Performance
Compliance ASTM C612 Mineral Fiber Block and Board Thermal Insulation, Type IVB Compliant
Compliance CAN/ULC S702 Mineral Fiber Thermal Insulation for Buildings, Type 1 Complaint
Reaction to Fire ASTM E84 (UL 723) Flame spread index = 0 ; Smoke development index = 0
Reaction to Fire CAN/ULC S102 Flame spread index = 0 ; Smoke development index = 0
Reaction to Fire CAN/ULC S114 Behaviour of materials at 750°C (1382°F) - Non Combustible
Reaction to Fire ASTM E136 Test for Non-Combustibility - Non Combustible
Density ASTM C303 Outer layer 6.2 lb/ft³ (100 kg/m³)
Density ASTM C303 Inner Density 4.1 lb/ft³ (65 kg/m³)
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 4.3 hr.ft2.F/Btu
Thermal Resistance ASTM C518 (C177) RSI value / 25.4mm @ 24oC 0.73 m2K/W
Reaction to Moisture ASTM C1104 Moisture Sorption by weight - 0.07%
Reaction to Moisture ASTM C1338 Determination of Fungi Resistance - Passed
Reaction to Moisture ASTM E96 Water Vapor Transmission , Disiccant Method - 1555 ng/Pa.s.m2 (27 perm)
Thickness Product is available in 2.5" to 5" thicknesses (64mm - 127mm)
Dimensions 16" x 48" (406mm x 1219mm), 24" x 48" (610mm x 1219mm)
Acoustical Performance ASTM C423 Thickness 125 Hz 250 Hz 500 Hz 1000 Hz 2000Hz 4000 Hz NRC
Acoustical Performance ASTM C423 3" 0.72 0.93 0.88 0.84 0.9 0.97 0.9

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