Engineering criteria for fire compartment separation walls in industrial facilities: rockwool sandwich panel thickness, intumescent fire seals, stitching screw patterns, and REI 60-120 compliance.
In industrial manufacturing, chemical warehouses, and logistics hubs, structural fire separation is a strict regulatory mandate safeguarding life safety, high-value machinery, and insurance compliance. Under modern building codes, expansive facilities must be partitioned into fire compartments. Firewalls designed to isolate fires for 60, 90, or 120 minutes are most reliably constructed using certified Rockwool Sandwich Panels per EN 14509 and EN 13501-2.
1. Fire Compartment Mandate
Fire compartments are self-contained enclosures engineered to prevent fire and toxic gas propagation into adjacent bays for designated durations. Building codes require segregating storage bays, high-voltage transformer rooms, and generator plant areas with walls meeting minimum REI 90 or REI 120.
2. Understanding REI: R, E, and I
Per EN 13501-2: R (Loadbearing capacity): Ability to remain structurally stable under load. E (Integrity): Preventing flame and toxic gas penetration through joints. I (Insulation): Restricting temperature rise on the unexposed face to below 140°C. Compartment walls strictly demand complete EI or REI ratings.
3. Lamella Fiber Orientation & Basalt Core
Unlike loose batting, sandwich panel cores comprise automated cut rockwool lamellas rotated 90 degrees so fibers stand perpendicular to steel skins. Made from volcanic basalt stone with a melting threshold exceeding 1,000°C and density of 100–120 kg/m³, it forms an impermeable thermal shield with Euroclass A1/A2-s1,d0 rating.
4. Intumescent Joint Seals
Groove seams receive continuous beads of heat-reactive intumescent fire seals during erection. Above 150°C, the seal expands 10x–15x its volume, vitrifying into an airtight ceramic barrier.
Comprehensive Engineering Comparison Matrix
| Rockwool Thickness | Core Density | Fire Classification | Fire Duration | Application Area |
|---|---|---|---|---|
| 50 mm | 100 kg/m³ | EI 30 | 30 Minutes | Standard partitions |
| 80 mm | 100 – 110 kg/m³ | EI 60 / REI 60 | 60 Minutes (1 Hr) | General industrial compartments |
| 100 mm | 110 – 120 kg/m³ | EI 90 / REI 90 | 90 Minutes (1.5 Hr) | Substations, logistics storage |
| 120 mm | 110 – 120 kg/m³ | EI 120 / REI 120 | 120 Minutes (2 Hrs) | High-risk chemical stores, firewalls |
Verdict: For certified industrial firewalls, specify 100mm to 120mm rockwool panels with perpendicular lamella orientation, intumescent joint seals, and certified test reports per EN 13501-2.
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Frequently Asked Questions
What is the primary fire distinction between PIR and Rockwool? ▼
PIR is self-extinguishing (B-s1,d0) but will eventually char under continuous flame. Rockwool is made of volcanic stone (A1 non-combustible), maintaining structural barrier integrity for up to 120 minutes at 1,000°C.