In Pakistan and the subcontinent, summer temperatures routinely exceed 45°C. For warehouses, factories, cold stores, and even residential buildings, this extreme heat means high energy bills, uncomfortable working conditions, and reduced equipment lifespan.
But there's a proven solution: PUF/PIR sandwich panels — and they can reduce indoor temperatures by 6-8°C without any active cooling.
How Does It Work?
Sandwich panels consist of two metal skins (usually PPGI steel) bonded to a core of rigid polyurethane foam (PUF) or polyisocyanurate (PIR). This foam core has an incredibly low thermal conductivity — typically 0.022 W/m·K for PUF.
When sunlight hits a conventional roof or wall, heat transfers through the material into the building. With a sandwich panel, the insulating core acts as a thermal barrier, dramatically slowing down heat transfer.
Real-World Temperature Difference
From our installations across Karachi, Lahore, and Multan, we've consistently measured:
- Conventional brick/concrete building: Indoor reaches 40-42°C on a 45°C day
- With 50mm PUF sandwich panel roof: Indoor stays at 33-35°C
- With 75mm panels: Indoor drops further to 31-33°C
That's a 6-8°C reduction — purely from insulation, with zero energy cost.
Benefits Beyond Cooling
- Lower AC costs: Smaller units needed, lower electricity bills
- Year-round comfort: Keeps warmth in during colder months
- Sound insulation: Reduces outside noise
- Fire resistance: PIR panels meet international fire safety standards
- Fast installation: Prefabricated panels install in days, not weeks
The Bottom Line
Whether you're building a cold room at -25°C or trying to survive a 45°C Karachi summer, sandwich panels are one of the most cost-effective investments you can make.