When to use this system
termPIR® Pro-F with FM Approvals certification is the highest fire and mechanical standard for flat roofs of premium logistics and warehouse facilities.
Choose this system when:
- Insurance policy requires FM Approvals — most premium policies (FM Global and major industry insurers) require FM certification for roof coverings on facilities >5,000 m².
- High-bay warehouse — where goods are stacked to 12+ m in height; in case of fire, the roof must withstand a specified time without collapse.
- Premium-class tenants — global e-commerce / logistics / retail operators often require facilities meeting FM Class 1 before signing a lease.
- Data centres and critical facilities — where the consequences of fire significantly outweigh the cost of premium insulation.
What is FM Approvals?
FM Approvals is the accreditation of the American insurer Factory Mutual Global — the most restrictive standard for certifying building materials in the industrial segment.
For roof insulation materials, FM tests:
- Class 1 Approval — roof impermeable to fire and non-ignitable after exposure to a heat flux (test FM 4470, 4471, 4470S).
- Mechanical strength — resistance to snow loads + hail impact (FM 4470 test).
- Layer cohesion — torch-on bituminous membrane must remain bonded to the insulation without delamination at temperatures down to –40°C.
Installation requirements
- Conditioning of boards — installation 1 month after production date (standard for all termPIR® products).
- Fastening — typically mechanical with telescopic fasteners to trapezoidal sheet, in a pattern compliant with FM Approvals (fastener density in edge zones: 6–8 pcs/m², in the field zone: 3–4 pcs/m²).
- Waterproofing membrane — FM Approvals compatible (TPO Carlisle, PVC Sika Sarnafil, Icopal FM-rated bituminous membrane).
- Vapour barrier — aluminium foil or PE membrane with diffusion certification compatible with FM.
- Edge zones — additional fastenings around the perimeter of the roof (up to 1.5 m from the edge) and around skylights, chimneys and parapets.
Pro-F vs standard termPIR® AL
| Parameter | termPIR® Pro-F | termPIR® AL |
|---|---|---|
| FM Approvals certification | YES (Class 1) | no |
| Compressive stress | σ10 = 150 kPa (higher than AL) | σ10 = 120 kPa |
| Facing | gas-tight aluminium foil optimised for FM | standard aluminium foil |
| λD | 0.022 W/(m·K) | 0.022 W/(m·K) |
| Price per m² | +15–25% | baseline |
| Typical customer | premium logistics | general construction |
Documentation
System described in termPIR® Folder 2025 (Gór-Stal, 2025-04-23, p. 11). FM Approvals Class 1 certificate — available on request from the manufacturer (certificate number provided in the termPIR® Pro-F technical data sheet).
Layer composition
| # | Layer | Thickness | λ | Role |
|---|---|---|---|---|
| 1 | Waterproofing / roof covering (TPO, PVC or bituminous membrane) | — | — | external waterproofing |
| 2 | termPIR® Pro-F | 50–220 mm | 0,022 W/(m·K) | thermal insulation with FM Approvals certification |
| 3 | Vapour barrier / membrane | — | — | water vapour barrier |
| 4 | Roof load-bearing structure (trapezoidal sheet or reinforced concrete slab) | — | — | load-bearing structure |
U-value by insulation thickness
| termPIR® thickness | U [W/m²·K] | Meets WT 2021 (roof U ≤ 0.15) |
|---|---|---|
| 80 mm | 0,26 | — no |
| 100 mm | 0,21 | — no |
| 120 mm | 0,18 | — no |
| 150 mm | 0,14 | ✓ yes |
| 180 mm | 0,12 | ✓ yes |
| 200 mm | 0,11 | ✓ yes |
| 220 mm | 0,10 | ✓ yes |
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