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ROXUL TOPROCK® DD is a high-density uncoated stone wool insulation board for low-slope roof applications. TOPROCK® DD is a suitable substrate board for all low-slope roof decks and is compatible as the substrate for mechanically attached membrane systems.

It has excellent acoustic properties and can be used either as a base layer of thermal insulation in an acoustic assembly with ROXUL TOPROCK® DD Plus as the top layer of a hybrid roof assembly with polyisocyanurate or other roof insulations.

  • Non-combustible, meeting FM 4470 NCC (Non-Combustible Core) Rating
  • Will not warp or cup
  • Dimensionally stable providing a long term, consistent thermal performance
  • High impact resistance
  • Excellent acoustic reduction, absorption and impact (rain noise) performance
  • Made from natural & recycled materials, ROXUL can contribute to earning LEED® points
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Technical Information

Property Test Standard Performance
Compliance ASTM C726 Standard Specification for Mineral Fiber Roof Insulation Boards
Compliance FM 4470 Approval Standard for Single Ply, Polymer Modified Bitumen Sheet, Built-Up Roof and Liquid Applied Roof Assemblies for use in Class 1 and Noncombustible Roof Deck Construction
Compliance FM 4470 NCC (Non Combustible Core) Rated Roof Insulation
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 NFPA 276 Standard Method of Fire Tests for Determining Heat Release Rate of Roofing Assemblies with Combustible Above Deck Roofing Components - Class 1
Reaction to Fire CAN/ULC S107-03 Fire Tests of Roof Coverings - Class A
Reaction to Fire CAN/ULC S126-06 Fire Spread under Roof Deck Assemblies - See ULC Directory
Reaction to Fire UL 790 (ASTM E108) Standard Test Methods for Fire Tests of Roof Coverings - Class A
Reaction to Fire UL 263 (ASTM E119) Fire Tests of Building Construction and Materials - See UL Directory
Density ASTM C303 Top Layer - 13.75 lb/ft³ (220 kg/m³), Bottom Layer - 10 lb/ft³ (160 kg/m³), Bottom Layer - 9.36 lb/ft³ (150 kg/m³) - for >2.5" (63.5mm) thicknesses
Dimensional Stability ASTM C356 Linear Shrinkage - 0.71% @ 1200°F (650°C)
Dimensional Stability ASTM D2126 Linear Change 7 days @ -40°F (-40°C), ambient RH - 0.1% Linear Change 7 days @ 200°F (93°C), ambient RH - 0.1% Linear Change 7 days @ 158°F (70°C), 97% RH - 0.0%
Hail Performance FM 4470 Test Standard for Susceptibility to Hail Damage - Class 1 - SH (Severe Hail)
Hail Performance FM 4473 Impact Resistance by Impacting with Freezer Ice Balls - Class 4
Hail Performance UL 2218 Impact Resistance of Prepared Roof Covering Materials - Class 4
Thermal Resistance ASTM C518 (C177)
Mean Temperature R-Value RSI Value
75°F (24°C) 3.8 hr.ft2.F/Btu 0.68 m2K/W
25°F (-4°C) 4.3 hr.ft2.F/Btu 0.74 m2K/W
40°F (4°C) 4.2 hr.ft2.F/Btu 0.72 m2K/W
110°F (43°C) 3.6 hr.ft2.F/Btu 0.64 m2K/W
Reaction to Moisture ASTM C1104 Moisture Sorption - 0.15%
Reaction to Moisture ASTM C209 Water Absorption - <1.0%>
Reaction to Moisture ASTM E96 Water Vapor Transmission, Desiccant Method - 2330 ng/Pa.s.m2 (41 perm)
Compressive Strength ASTC C165 Top Layer - 20psi (140kPa) @ 10%, 37psi (250kPa) @ 25% Entire Board - 11psi (75kPa) @ 10%, 15psi (105kPa) @ 25%
Compressive Strength EN 12430 Point Load @ 5mm Compression - 30psi (205 kPa)
Corrosion Resistance ASTM C795 Stress Corrosion Cracking Tendency of Austenitic Stainless Steel - Passed
Corrosion Resistance ASTM C665 Corrosion of Steel - Passed
Thickness Product available in 2" - 6" (50.8mm - 152.4mm) in 1/2" (12.7mm) increments
Dimensions 48"x48" (1219mm x 1219mm)
Acoustical Performance ASTM C423
Thickness 125 Hz 250 Hz 500 Hz 1000 Hz 2000Hz 4000 Hz NRC
2' 0.5 0.71 0.85 0.9 0.96 1.01 0.85
Acoustical Performance ASTM C423
Acoustical Performance ASTM E90 Contact ROXUL for STC rated assemblies

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