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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Specification & sizes

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ComplianceASTM C726 - FM 4470
ASTM C726Standard 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

DensityASTM C303
ASTM C303Top Layer - 13.75 lb/ft³ (220 kg/m³)
ASTM C303Bottom Layer - 10 lb/ft³ (160 kg/m³) - for 2” (50.8mm) and 2.5” (63.5mm) thickness
ASTM C303Bottom Layer - 9.36 lb/ft³ (150 kg/m³) - for >2.5” (63.5mm) thicknesses
Dimensional stabilityASTM C356 - ASTM D2126
ASTM C356Linear 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%

Dimensions48” x 48” (1219 mm x 1219 mm)
ThicknessProduct available in 2” - 4” (50.8 mm - 101.6 mm) in 1/2” (12.7 mm) increments
Reaction to fireASTM 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 S114Determination 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 S107-03Fire Tests of Roof Coverings - Class A
CAN/ULC S126-06Fire 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 resistanceASTM C518 (C177)
ASTM C518 (C177)Mean TemperatureR-ValueRSI Value
 75°F (24°C)3.8 hr.ft2.F/Btu0.68 m2K/W
 25°F (-4°C)4.3 hr.ft2.F/Btu0.74 m2K/W
 40°F (4°C)4.2 hr.ft2.F/Btu0.72 m2K/W
 110°F (43°C)3.6 hr.ft2.F/Btu0.64 m2K/W
Acoustical PerformanceASTM C423 - ASTM E90
ASTM C423Thickness125 Hz 250 Hz500 Hz1000 Hz2000 Hz4000 HzNRC
2'0.50.710.850.90.961.010.85 
ASTM E90Contact ROCKWOOL for STC rated assemblies
Reaction to moistureASTM C1104 - ASTM C209 - ASTM E96
ASTM C1104Moisture Sorption - 0.15%
ASTM C209Water Absorption - <1.0%
ASTM E96Water Vapor Transmission, Desiccant Method - 2330 ng/Pa.s.m2 (41 perm)
Compressive strengthASTM C165 - EN 12430
ASTM C165Top Layer - 20psi (140kPa) @ 10%, 37psi (250kPa) @ 25%
EN 12430Entire Board - 11psi (75kPa) @ 10%, 15psi (105kPa) @ 25%
  
Corrosion ResistanceASTM C795 - ASTM C665
ASTM C795Stress Corrosion Cracking Tendency of Austenitic Stainless Steel - Passed
ASTM C665Corrosion of Steel - Passed
Back
ASTM C726Standard 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

Back
ASTM C303Top Layer - 13.75 lb/ft³ (220 kg/m³)
ASTM C303Bottom Layer - 10 lb/ft³ (160 kg/m³) - for 2” (50.8mm) and 2.5” (63.5mm) thickness
ASTM C303Bottom Layer - 9.36 lb/ft³ (150 kg/m³) - for >2.5” (63.5mm) thicknesses
Back
ASTM C356Linear 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%

Back
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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 S114Determination 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 S107-03Fire Tests of Roof Coverings - Class A
CAN/ULC S126-06Fire 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 TemperatureR-ValueRSI Value
 75°F (24°C)3.8 hr.ft2.F/Btu0.68 m2K/W
 25°F (-4°C)4.3 hr.ft2.F/Btu0.74 m2K/W
 40°F (4°C)4.2 hr.ft2.F/Btu0.72 m2K/W
 110°F (43°C)3.6 hr.ft2.F/Btu0.64 m2K/W
Back
ASTM C423Thickness125 Hz 250 Hz500 Hz1000 Hz2000 Hz4000 HzNRC
2'0.50.710.850.90.961.010.85 
ASTM E90Contact ROCKWOOL for STC rated assemblies
Back
ASTM C1104Moisture Sorption - 0.15%
ASTM C209Water Absorption - <1.0%
ASTM E96Water Vapor Transmission, Desiccant Method - 2330 ng/Pa.s.m2 (41 perm)
Back
ASTM C165Top Layer - 20psi (140kPa) @ 10%, 37psi (250kPa) @ 25%
EN 12430Entire Board - 11psi (75kPa) @ 10%, 15psi (105kPa) @ 25%
  
Back
ASTM C795Stress Corrosion Cracking Tendency of Austenitic Stainless Steel - Passed
ASTM C665Corrosion of Steel - Passed
Back
NFPA 285 Test Method with Tony Crimi
Video

Comparative Roof Insulation Fire Test with Tony Crimi

NFPA 285 Test Method with Tony Crimi, fire resistance, fire proof, non-combustible
Video

ROCKWOOL and Volvo on Fire Safety

MULTIFIX Product page roof roofing
Video

ROCKWOOL and Volvo on Fire Safety

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Roofing Rated Acoustic Assembly Guide

MULTIFIX Product page roof roofing
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462.8 KB

Multifix technical datasheet:

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