Sandwich Panels for Warehouses in Saudi Heat: PU, PIR or Rock Wool?
Insulated sandwich panels for Saudi warehouses and cold stores: PU vs PIR vs rock wool cores, thickness, U-values, fire performance, Saudi Building Code energy rules and installation.
Saudi Steel Work Editorial Team · · 3 min read
Short answer: Sandwich panels have two steel skins bonded to an insulating core. PU and PIR cores give the best insulation per thickness, with PIR offering better fire behaviour than PU; rock wool cores are non-combustible and preferred where fire performance governs. Thickness is chosen for the required thermal performance and use, such as cold storage.
In Saudi Arabia's heat, the building envelope strongly affects energy costs, product quality and worker comfort. Insulated sandwich panels are the most common solution for warehouses, factories and cold stores.
Construction
- Outer skin: pre-painted steel (often PPGI or PPGL), profiled on roofs
- Core: insulation bonded to both skins
- Inner skin: pre-painted steel, often lightly profiled
Core options
| Core | Insulation | Fire | Weight | Notes |
|---|---|---|---|---|
| PU (polyurethane) | Very good | Combustible | Light | Economical |
| PIR (polyisocyanurate) | Very good | Better than PU | Light | Common upgrade |
| Rock wool (mineral wool) | Good | Non-combustible | Heavier | For fire-sensitive buildings |
| EPS | Moderate | Combustible | Light | Lower cost, less common for industrial |
Choosing thickness
Thickness is selected to achieve the thermal performance required by the design and the Saudi Building Code energy provisions, and by use:
- Ambient warehouses: moderate thickness
- Air-conditioned factories: greater thickness
- Cold and freezer stores: significantly thicker panels
Fire safety
Civil Defense and insurer requirements may restrict combustible cores in some occupancies. Rock wool or certified PIR panels with fire test reports are often required. Ask for test certificates.
Installation points
- Correct fixings and thermal washers
- Sealing at joints to prevent air and moisture leaks
- Protecting factory film until installation, then removing promptly in sun
- Proper flashings at ridges, eaves and openings
Benefits
- Lower cooling loads and energy cost
- Better product protection
- Fast installation — one component instead of liner, insulation and outer sheet
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