Sandwich panel roofing systems are the most preferred solution in industrial facility construction with their thermal performance, fast installation advantage and long service life. The correct panel type and thickness selection directly affects both initial investment cost and 20-year operating cost. In this guide, we examine the insulation options of industrial roof sandwich panels in detail and present the parameters that should be considered in your project.
What is an Industrial Sandwich Panel Roof?
An industrial sandwich panel roof is a composite roofing system created by sandwiching insulation material (PUR, PIR, rock wool or EPS) between two metal surfaces (galvanized steel or aluminum). Manufactured according to the TS EN 14509 standard, these panels combine load-bearing, insulation and coating functions in a single element.
Compared to traditional roofing systems, sandwich panels offer 3-5 times faster installation time and a 20-30% lower total cost throughout the structure’s life cycle. These advantages make sandwich panels the standard choice in industrial buildings, logistics warehouses, production facilities and cold storage roofs.
Insulation Material Options: PUR, PIR, Rock Wool, EPS
The performance of a roof sandwich panel is largely determined by the filling material. Four main material options used in the sector:
PUR (Polyurethane): The most preferred filling type with low thermal conductivity (λ = 0.024 W/mK). Suitable for projects where high thermal performance is sought.
PIR (Polyisocyanurate): A more fire-resistant option than PUR. With its B-s2,d0 fire class according to the EN 13501-1 standard, it is preferred in facilities subject to strict fire regulations.
Rock Wool (Mineral Wool): The most fire-resistant option with its A1 (non-combustible) fire class. Mandatory for high fire risk facilities such as chemical plants, pharmaceutical production and airport hangars.
EPS (Expanded Polystyrene): The most economical option. Suitable for short-lived temporary structures or budget-constrained projects, but with lower fire performance.
Roof Sandwich Panel Prices: 2025 Market Analysis
Roof sandwich panel prices vary depending on filler type, thickness, surface coating and project volume. Indicative price ranges in the 2025 Turkish market:
| Panel Type | 80 mm Thickness | 100 mm Thickness | 120 mm Thickness |
|—|—|—|—|
| PUR | €15-18/m² | €18-22/m² | €22-26/m² |
| PIR | €18-22/m² | €22-26/m² | €26-30/m² |
| Rock Wool | €22-28/m² | €28-34/m² | €34-40/m² |
| EPS | €10-13/m² | €13-16/m² | €16-19/m² |
Prices are indicative; final price varies according to project size, special profile selection and logistics distance.
Bosan Industrial Building offers project-specific pricing within the scope of free technical consultancy in roof sandwich panel projects.
Industrial Roof Insulation: Performance Comparison by Climate Zones
The minimum U-value requirements for roofs in different climate zones are defined within the scope of the TS 825 Thermal Insulation Rules in Buildings standard. Especially in 3rd and 4th climate zones (Central Anatolia, Eastern Anatolia), the U ≤ 0.25 W/m²K value required for roofs may not be met with EPS panels of standard thickness; in these cases, PUR/PIR or thicker rock wool panels become mandatory.
For Marmara and Aegean regions, the U ≤ 0.40 W/m²K value can be met with 80 mm PUR or 100 mm rock wool panels. For Central Anatolia and Eastern Anatolia, 120-150 mm PUR/PIR thickness is recommended.
Sandwich Panel Roof Installation Process
Correct panel selection is as important as correct installation. The majority of installation errors lead to thermal bridge formation, condensation problems and sealing losses at panel-to-panel transition points.
Basic installation criteria:
Bosan Industrial Building applies engineering-supported project planning as a standard process before installation in projects carried out throughout Turkey, especially in Kocaeli, Istanbul and Ankara.
FAQ: Frequently Asked Questions About Sandwich Panel Roofing Systems
Which is better, polyurethane or rock wool sandwich panel?
Both panel types have different use cases where they stand out. Polyurethane (PUR) filled panel offers better thermal performance in facilities where energy efficiency is prioritized thanks to its low lambda value (λ = 0.022 – 0.024 W/mK). Rock wool filled panel is preferred in buildings where fire safety is critical with its A1 fire class. The choice should be made according to the facility’s intended use, fire risk class, regional climate conditions and budget parameters.
How much does EPS sandwich panel cost and when should it be preferred?
EPS sandwich panel offers approximately 15-25% lower initial investment cost compared to PUR panel. However, due to its low energy efficiency (λ ≈ 0.035 W/mK) and limited fire performance (E-F class), its long-term cost may be higher. EPS panel is suitable for short-lived structures, agricultural warehouses or budget-constrained projects.
What is the optimum sandwich panel thickness for an industrial roof?
Optimum thickness varies according to climate zone and the function of the building. For warehouse and production facilities in Marmara region 80-100 mm, in Central Anatolia 100-120 mm, and in Eastern Anatolia 120-150 mm PUR/PIR filled panel thickness is recommended. For cold storage roofs, the thickness should be selected at least 100 mm and according to the target temperature.
How long is the sandwich panel roof life?
The service life of correctly installed and maintained sandwich panel roofing systems is on average 25-30 years. PVDF coated panels can provide service life of up to 40 years. The most important factor affecting life is the proper application of installation details (sealing, thermal bridge prevention, drainage).
Conclusion: A Strategic Decision for Your Industrial Facility
Sandwich panel roofing system selection is not just a material decision; it is a strategic decision that affects the energy efficiency, operating costs and asset value of your facility for years to come. As Bosan Industrial Building, we offer the most suitable panel type, thickness and assembly planning for your project with turnkey solutions.
Contact our technical team today for your project: bosanyapi.com.tr | +90 530 282 04 49 | [email protected]
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