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MULTIFIX Hero, roof, roofing insulation, construction, insulation
Flat Roof Insulation Standing Seam Multi-Ply Single Ply

MULTIFIX™

ROCKWOOL MULTIFIX™ is the first stone wool insulation product with a mineral-coated fiberglass facer that is compatible with multiple attachment methods including torched, hot-mopped, self-adhered, cold-adhered and liquid systems.

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MULTIFIX is a dual-density, stone wool insulation board with a glass fiber coating for flat roofing applications

ROCKWOOL MULTIFIX™ is the first stone wool insulation product with a mineral-coated fiberglass facer that is compatible with multiple attachment methods including torched, hot-mopped, self-adhered, cold-adhered and liquid systems.

It can be used as an insulating coverboard over other insulations. In these cases, it improves performance by regulating the temperature of the thermal insulation. In fact, just one layer improves the performance of the entire assembly.

ROCKWOOL MULTIFIX™ has exclusive stone wool dualdensity properties that feature a higher-density top layer, providing strong point load resistance and effective load distribution to minimize puncture damage to the membrane – particularly during installation.

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Specification & sizes

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Compliance ASTM C726 - FM 4470
ASTM C726 Standard Specification for Mineral Fiber Roof Insulation Boards
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

NCC (Non Combustible Core) Rated Roof Insulation

Density ASTM C303
ASTM C303 Top Layer - 13.75 lb/ft³ (220 kg/m³)
ASTM C303 Bottom Layer - 10 lb/ft³ (160 kg/m³) - for 2” (50.8mm) and 2.5” (63.5mm) thickness
ASTM C303 Bottom Layer - 9.36 lb/ft³ (150 kg/m³) - for >2.5” (63.5mm) thicknesses
Dimensional stability ASTM C356 - ASTM D2126
ASTM C356 Linear Shrinkage - 0.71% @ 1200°F (650°C)
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%

Dimensions 48” x 48” (1219 mm x 1219 mm)
Thickness Product available in 2” - 4” (50.8 mm - 101.6 mm) in 1/2” (12.7 mm) increments
Reaction to fire ASTM E84 (UL 723)*** - CAN/ULC S102*** - CAN/ULC S114 - NFPA 276 - CAN/ULC S107-03 - CAN/ULC S126-06 - UL 790 (ASTM E108) - UL 263 (ASTM E119)
ASTM E84 (UL 723)***  Flame spread index = 0; Smoke developed index = 0
CAN/ULC S102*** Flame spread index = 0; Smoke developed index = 0
CAN/ULC S114 Determination of Non Combustibility of Building Materials - Non Combustible
NFPA 276 - 

Standard Method of Fire Tests for Determining Heat Release Rate of Roofing Assemblies with

Combustible Above Deck Roofing Components - Class 1

CAN/ULC S107-03 Fire Tests of Roof Coverings - Class A
CAN/ULC S126-06 Fire Spread under Roof Deck Assemblies - See ULC Directory
UL 790 (ASTM E108) Standard Test Methods for Fire Tests of Roof Coverings - Class A
UL 263 (ASTM E119) Fire Tests of Building Construction and Materials - See UL Directory
Thermal resistance ASTM C518 (C177)
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
Acoustical Performance ASTM C423 - ASTM E90
ASTM C423 Thickness 125 Hz  250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz NRC
2' 0.5 0.71 0.85 0.9 0.96 1.01 0.85  
ASTM E90 Contact ROCKWOOL for STC rated assemblies
Reaction to moisture ASTM C1104 - ASTM C209 - ASTM E96
ASTM C1104 Moisture Sorption - 0.15%
ASTM C209 Water Absorption - <1.0%
ASTM E96 Water Vapor Transmission, Desiccant Method - 2330 ng/Pa.s.m2 (41 perm)
Compressive strength ASTM C165 - EN 12430
ASTM C165 Top Layer - 20psi (140kPa) @ 10%, 37psi (250kPa) @ 25%
EN 12430 Entire Board - 11psi (75kPa) @ 10%, 15psi (105kPa) @ 25%
   
Corrosion Resistance ASTM C795 - ASTM C665
ASTM C795 Stress Corrosion Cracking Tendency of Austenitic Stainless Steel - Passed
ASTM C665 Corrosion of Steel - Passed
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ASTM C726 Standard Specification for Mineral Fiber Roof Insulation Boards
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

NCC (Non Combustible Core) Rated Roof Insulation

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ASTM C303 Top Layer - 13.75 lb/ft³ (220 kg/m³)
ASTM C303 Bottom Layer - 10 lb/ft³ (160 kg/m³) - for 2” (50.8mm) and 2.5” (63.5mm) thickness
ASTM C303 Bottom Layer - 9.36 lb/ft³ (150 kg/m³) - for >2.5” (63.5mm) thicknesses
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ASTM C356 Linear Shrinkage - 0.71% @ 1200°F (650°C)
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%

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ASTM E84 (UL 723)***  Flame spread index = 0; Smoke developed index = 0
CAN/ULC S102*** Flame spread index = 0; Smoke developed index = 0
CAN/ULC S114 Determination of Non Combustibility of Building Materials - Non Combustible
NFPA 276 - 

Standard Method of Fire Tests for Determining Heat Release Rate of Roofing Assemblies with

Combustible Above Deck Roofing Components - Class 1

CAN/ULC S107-03 Fire Tests of Roof Coverings - Class A
CAN/ULC S126-06 Fire Spread under Roof Deck Assemblies - See ULC Directory
UL 790 (ASTM E108) Standard Test Methods for Fire Tests of Roof Coverings - Class A
UL 263 (ASTM E119) Fire Tests of Building Construction and Materials - See UL Directory
Back
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
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ASTM C423 Thickness 125 Hz  250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz NRC
2' 0.5 0.71 0.85 0.9 0.96 1.01 0.85  
ASTM E90 Contact ROCKWOOL for STC rated assemblies
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ASTM C1104 Moisture Sorption - 0.15%
ASTM C209 Water Absorption - <1.0%
ASTM E96 Water Vapor Transmission, Desiccant Method - 2330 ng/Pa.s.m2 (41 perm)
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ASTM C165 Top Layer - 20psi (140kPa) @ 10%, 37psi (250kPa) @ 25%
EN 12430 Entire Board - 11psi (75kPa) @ 10%, 15psi (105kPa) @ 25%
   
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ASTM C795 Stress Corrosion Cracking Tendency of Austenitic Stainless Steel - Passed
ASTM C665 Corrosion of Steel - Passed

Product Range

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