Rock Wool Board for Flexible Roof Insulation is a high-strength, rigid thermal insulation board specifically engineered for use in flat or low-slope roofing systems.
Unlike wall insulation, which focuses on tensile strength, roof insulation is optimized for load-bearing capacity and durability to withstand the mechanical stresses of installation and long-term maintenance.
| Product Performance | LL-RWBS-04 | Unit | Standard |
|---|---|---|---|
| Compressive strength | ≥80 | KPa | GB/T 13480 |
| Tensile strength (normal to surface) | ≥200 | KPa | GB/T 30804 |
| The average diameter of fibers | ≤5 | μm | GB/T 5480 |
| Shot content | ≤4 | % | GB/T 5480 |
| Thermal conductivity (25°C) | ≤0.043 | W/(m · k) | GB/T 30802 |
| Combustion performance | Class A | --- | GB 8624-2012 |
| Acidity coefficient | ≥1.8 | --- | GB/T 5480 |
| Hydrophobic rate | ≥99 | % | GB/T 10299 |
| Mass moisture absorption rate | ≤1.0 | % | GB/T 5480 |
| Short-term water absorption (24h) | ≤0.5 | kg/m² | GB/T 30805 |
| Noise reduction coefficient (NRC) | ≥0.6 | --- | GB/T 18696.1 |
| Dimensional stability | ≤1.0 | % | GB/T 30806 |
| Melting temperature | ≥1000 | °C | --- |
| Thickness tolerance | ±1 | mm | GB/T 5480 |
| Flatness tolerance | ≤2 | mm | GB/T 25975-2018 |
Rock wool roofing boards are Euroclass A1 non-combustible with a melting point exceeding 1000°C. They do not ignite, propagate flames, or release toxic smoke during fire exposure. In flat roofs on steel or concrete decks, they provide a reliable fire barrier, protecting structural elements and contents while offering superior performance compared to combustible plastic foams (PIR, EPS, XPS).
2. High Compressive Strength and Resistance to Foot TrafficRoof systems often require access for maintenance, HVAC equipment, solar panels, or inspections. Roofing-grade rock wool boards are designed with high compressive strength (typically ≥40–80 kPa at 10% deformation). Many feature dual-density construction—a denser, harder top layer that resists point loads, puncturing, and indentation, thereby protecting the waterproofing membrane from damage.
3. Superior Rain Noise ReductionOn metal deck roofs with single-ply membranes, rain and hail can produce significant “drumming” noise. The dense, fibrous structure of rock wool acts as an effective acoustic absorber, typically reducing rain-impact noise by 8–15 dB compared to plastic foam insulations, resulting in a noticeably quieter indoor environment.
4. Outstanding Dimensional StabilityRoofing insulation is exposed to wide temperature fluctuations (from sub-zero winters to roof surface temperatures exceeding 80°C in summer). Rock wool exhibits virtually no shrinkage, expansion, or warping over time. This stability prevents the formation of gaps or thermal bridges and minimizes stress on membrane joints, reducing the risk of leaks common in less stable insulation materials.
5. Long-Term Thermal Performance and Chemical CompatibilityAs an inorganic material without blowing agents, rock wool maintains its declared thermal conductivity (λ value) throughout the building’s lifespan. It is fully compatible with common single-ply roofing membranes (PVC, TPO, EPDM) and associated adhesives, exhibiting no chemical reactions that could degrade the waterproofing layer or cause long-term performance loss.
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2. Can our rock wool board support foot traffic on flexible roofs?
Yes. Our flexible roof rock wool boards are engineered with high density (140kg/m³~160kg/m³) and high point load resistance (≥500N), making them capable of withstanding regular foot traffic for maintenance without deforming or damaging the waterproof membrane.
3. Why use rock wool instead of PIR/EPS for industrial roofs?
While PIR/EPS are lightweight, Rock Wool is non-combustible (A1). In large-scale industrial plants, rock wool provides a critical fire barrier that prevents fire spread across the roof, while its breathable nature prevents moisture buildup in the roofing system.
4. Why should you buy from us and not from other suppliers?
