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ROXUL MONOBOARD® is a high-density, uncoated stone wool insulation board for low slope roof applications. MONOBOARD® can be used as an insulating cover board or roof board in low-slope systems to provide additional fire and thermal resistance as well as being a suitable substrate for mechanically attached systems.

MONOBOARD® provides added resilience and thermal resistance to metal, concrete and wood decking systems when used in conventional roofing systems underneath a membrane. This product can also be used as a re-cover board to add thermal, fire and acoustic properties to existing roof systems to increase performance or extend the life of the system.


  • 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 Actual Density - 12.5 lb/ft³ (200 kg/m³)
Dimensional Stability ASTM C356 Linear Shrinkage - 1.1% @ 1200°F (650°C)
Dimensional Stability ASTM D2126 Linear Change 7 days @ 40°F (-40°C), ambient RH - 0.0%
Dimensional Stability ASTM D2126 Linear Change 7 days @ 200°F (93°C), ambient RH - 0.1%
Dimensional Stability ASTM D2126 Linear Change 7 days @ 158°F (70°C), 97% RH - 0.1%
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) 4.0 hr.ft2.F/Btu 0.70 m2K/W
25°F (-4°C) 4.4 hr.ft2.F/Btu 0.77 m2K/W
40°F (4°C) 4.3 hr.ft2.F/Btu 0.75 m2K/W
110°F (43°C) 3.7 hr.ft2.F/Btu 0.66 m2K/W
Reaction to Moisture ASTM C1104 Moisture Sorption - 0.29%
Reaction to Moisture ASTM C209 Water Absorption - <1.0%>
Reaction to Moisture ASTM E96 Water Vapor Transmission, Desiccant Method - 2360 ng/Pa.s.m2 (41 perm)
Compressive Strength ASTC C165 11psi (75kPa) @ 10% compression
Compressive Strength ASTC C165 28psf (190kPa) @ 25% compression
Corrosion Resistance ASTM C795 Stress Corrosion Cracking Tendency of Austenitic Stainless Steel - Passed
Corrosion Resistance ASTM C665 Corrosion of Steel - Passed
Thickness Nominal - 1" (25.4mm) Actual - 1.04" (26.4mm)
Dimensions 48"x48" (1219mm x 1219mm)
Acoustical Performance
Thickness 125 Hz 250 Hz 500 Hz 1000 Hz 2000Hz 4000 Hz NRC
1" 0.13 0.49 0.85 0.89 0.89 0.97 0.8
Acoustical Performance ASTM E90 Contact ROXUL for STC rated assemblies
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