Sandwich Panel Installation for Building Extensions and Renovations

A sandwich panel is a composite structure consisting of two outer layers (typically made of galvanized steel, aluminum, or coated metal) with an insulating core material in between (such as PUR, PIR, mineral wool, EPS). Below are the key technical specifications to consider when selecting these panels, especially in regions like Saudi Arabia (high temperatures, desert environment, fire requirements, etc.). ⸻ 🔍 Basic Technical Specifications 1. Thickness • Panel thickness can range from ~30 mm to over 200 mm depending on application (wall, roof, cold room). • Examples: 50 mm, 75 mm, 100 mm, 150 mm, 200 mm. 2. Thermal Insulation • Thermal conductivity coefficient (λ) of the core, typically PUR/PIR type, is approximately 0.019–0.023 W/m·K. • Heat transfer coefficient (U-value) decreases with increased thickness and insulation: for example, a 50 mm wall panel has U ≈ 0.48 W/m²K, while a 100 mm panel has U ≈ 0.23 W/m²K. • Thermal resistance (R-value) is related to thickness: the greater the thickness, the higher the R-value. 3. Core Density • For example, PUR or PIR cores may have a density of approximately 38–42 kg/m³. • Some specifications indicate 40 ±2 kg/m³. 4. Outer Layers and Metal Used • The outer metal is typically galvanized steel, aluminum, or even stainless steel, with coatings such as Polyester or PVDF. • Sheet metal thickness and coating are important to ensure resistance to climate, corrosion, and UV radiation. 5. Fire Resistance Rating • Common ratings: B2 according to DIN 4102 standard or higher (B1, A2), depending on core type. • Using a mineral wool core significantly enhances fire resistance. 6. Acoustic Insulation • Some panels achieve acoustic insulation such as STC of approximately 50–58 dB when using a mineral wool core. 7. Dimensions, Width, and Weight • Actual width is typically ~1000–1170 mm per panel. • Length is customizable based on project needs, sometimes up to 12 meters or more. • Weight per square meter varies depending on thickness and core type; for example, thicker panels have higher weight. 8. Installation and Connection • There are various systems and fittings such as Male-Female Lock or CAM-Lock to ensure proper panel interlocking. • Attention must be paid to joint treatment and weatherproofing (waterproofing, moisture resistance), especially in areas like Riyadh. ⸻ ✅ Summary of Recommendations for Use in Saudi Arabia • Choose an appropriate thickness: for example, in hot environments such as industrial facilities or warehouses, a thickness of 100 mm or more with a high-performance core may be practical. • Ensure the core has sufficient density and good thermal insulation (low λ value). • Due to high temperatures and intense sunlight, the outer metal and coating must be resistant to corrosion and UV radiation; PVDF coating or equivalent high-quality finish is recommended. • For high safety requirements or storage facilities handling sensitive materials, consider mineral wool or PIR cores with higher fire ratings. • Acoustic insulation may not be a priority in all projects, but if a quiet working environment is needed, select panels with enhanced acoustic core properties. • Installation should be carried out by qualified professionals to ensure proper connections, waterproofing, and prevention of thermal bridging. ⸻ If you'd like, I can send you detailed tables with different panel specifications (thicknesses, core types, price comparisons in Saudi Arabia) so you can choose the most suitable option for your project. Would you like that?