Multifix™
ROCKWOOL Multifix™ is a high-density insulation board with a mineral-coated fiberglass facer for low-slope roof applications. It is compatible as the substrate for torched, hot mopped, self-adhered, cold-adhered, and liquid membrane systems.
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Popular applications
- Roof insulation
- Low slope roof insulation
About this product
ROCKWOOL Multifix™ is a stone wool insulation board with a mineral-coated fiberglass facer, designed for low-slope roof applications. Multifix is compatible with torched, hot mopped, self-adhered, cold-adhered, and liquid applied membrane systems.
Noncombustible, Multifix will not develop toxic smoke or promote flame spread even when directly exposed to fire. Also offering improved sound absorbency and dimensional stability, Multifix is designed to maintain long-term thermal and acoustic performance.
- Noncombustible and fire resistant
- NCC (Non Combustible Core) Rated Roof Insulation
- Liquid applied, cold adhered membrane solutions
- Water and moisture repellent
- Dimensional stability to maintain performance
- Excellent acoustic performance
Why use stone wool insulation
- Stable long-term R-values for superior thermal performance.
- Made from naturally fire resilient stone, ROCKWOOL insulation will not develop toxic smoke or promote flame spread, even when exposed to a fire.
- Stone wool provides excellent noise reduction and sound absorption to help you create quieter, more productive environments.
- Water resistant, stone wool does not rot or promote the growth of mildew, fungi or mold.
- The manufactured dual-density boards provide increased compressive strength and point load resistance to minimize puncture damage from foot traffic and severe weather.
- Dimensionally stable, stone wool does not expand or contract due to temperature variances.
Applications
- Versatile insulation for flat roof applications.
- Direct-to-deck installation simplifies process.
- Cold-adhered assemblies, including TPO, PVC and KEE membranes.
- Torch or hot adhesive membranes.
- Liquid applied membrane assemblies.
Product certificates
Miami-Dade County Approved
FM Approved
UL Classified - CA/USA
Multifix™ sizes, dimensions & packaging
Find Multifix™ thickness, width, length and pack quantities—everything you need for accurate specification and ordering.
- All
- 2
- 3
Specifications & testing
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| Name | Value | Unit | Test standard |
|---|---|---|---|
| NCC (Non Combustible Core) Rated Roof Insulation | Passed | FM 4470 | |
| Flame spread index | 0 | ASTM E84 | |
| Smoke Developed Index | 0 | ASTM E84 | |
| Combustibility of Materials at 750 °C | Non-combustible | ASTM E136 | |
| Determination of Non Combustibility of Building Materials | Non-combustible | CAN/ULC S114 | |
| Fire Tests of Roof Coverings | Class A | CAN/ULC S107-03 | |
| Heat Release Rate of Roofing Assemblies with Combustible Components | Class 1 | NFPA 276 | |
| Corrosion of Steel | Passed | ASTM C665 | |
| R-Value / inch @ 75 °F | 3.8 | hr.ft².F/Btu | ASTM C518 (C177) |
| RSI value / 25.4 mm @ 24 °C | 0.67 | m²K/W | ASTM C518 (C177) |
Multifix™ technical documents & resources
Download Multifix™ technical documents and resources, including the product data sheet, to support accurate specification and efficient project planning.
Multifix flat roof insulation - Data sheet
Multifix_072200 Roof and Deck Insulation GUIDESPEC EN_US
Multifix_072200 Roof and Deck Insulation GUIDESPEC EN_CA
Construction Details - Industrial Commercial Masonry Construction with Exterior Insulation up to 4 stories
Dimensional stability of rigid board insulation products
Guidelines for cutting stone wool insulation
Enhancing metal roofing systems with stone wool insulation
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Product support & insights
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