How to Choose Polycarbonate Sheets for Different Climates
Polycarbonate sheets are widely used for canopies, carports, greenhouses, daylighting projects and industrial buildings. However, the same specification may perform differently under different climate conditions.
For international projects, it is more practical to select sheets according to the local climate rather than simply dividing the market by country. Some projects may involve more than one climate factor. Tropical coastal areas, for example, need to consider both strong sunlight and wind load.
As an industry reference, clear solid polycarbonate sheets typically have a density of approximately 1.2 g/cm³. A 3 mm clear solid sheet can achieve approximately 90% light transmission.
Hot and Dry Regions
Hot and dry regions usually experience strong sunlight, long UV exposure and large temperature differences between daytime and nighttime.
- Choose outdoor-grade sheets with UV protection and ensure that the UV-protected side faces outward during installation.
- Do not focus only on the highest light transmission. For canopies and covered areas, heat control may be equally important.
- Allow sufficient room for thermal expansion. The typical linear thermal-expansion coefficient of flat polycarbonate sheets is approximately 0.068 mm per metre per °C.
Rainy and Humid Regions
In rainy and humid areas, sheet quality is important, but drainage, sealing and installation details are equally critical.
- Design a reasonable drainage slope. Industry installation guidance recommends a minimum roof slope of 5° to allow adequate rainwater run-off.
- For hollow sheets, install the ribs vertically or up-slope. Use sealing tape at the upper end and breather tape at the lower end.
- For corrugated sheets, match the overlap direction to the prevailing wind and rain direction, and avoid over-tightening screws.
Cold and Snowy Regions
Cold regions require more attention to thermal insulation, structural safety and snow load.
- Compare U-values rather than only thickness. A lower U-value generally means better thermal-insulation performance.
- Industry reference data: a 10 mm twinwall sheet has a U-value of approximately 3.2 W/m²·K, while a 16 mm fivewall sheet can reach approximately 1.9 W/m²·K.
- Calculate the snow load before confirming thickness. Sheet size, roof slope, support spacing, profiles and fasteners should be evaluated as one system.
Quick Selection Guide
|
Climate Condition |
Solid Sheet |
Hollow Sheet |
Corrugated Sheet |
|
Hot and dry |
Canopies and carports requiring impact resistance |
Daylighting and greenhouse projects |
Industrial or agricultural daylighting |
|
Rainy and humid |
Residential and commercial canopies |
Projects with correct slope and sealed edges |
Projects with correct overlap design |
|
Cold and snowy |
Outdoor projects requiring impact resistance |
Projects requiring better insulation |
Use after structural and load checks |
|
Coastal and windy |
Canopies with reliable fixing systems |
Use with suitable support spacing |
Use with matching profiles and sufficient fixing points |
Conclusion
Different climates require different polycarbonate-sheet solutions. Hot regions need UV protection and thermal-expansion allowance. Rainy regions require drainage slopes and reliable sealing. Cold regions should focus on insulation and snow-load calculation. Coastal regions need a complete wind-resistant fixing system.
The best solution is not necessarily the thickest sheet. It is the specification that matches the local climate, structural design and installation method.
FAQ
Q1. Which polycarbonate sheet is suitable for hot and dry climates?
For outdoor canopies and carports, solid sheets are a practical choice. For greenhouse and daylighting projects, hollow sheets can be selected. For industrial or agricultural daylighting, corrugated sheets can be used according to the supporting structure.
Q2. Which polycarbonate sheet is suitable for rainy and humid regions?
For residential and commercial canopies, solid sheets are suitable. Hollow sheets can be used for greenhouses and daylighting projects with proper drainage slopes and sealed edges. Corrugated sheets require correct overlap direction and fixing details.
Q3. Which polycarbonate sheet is suitable for cold and snowy regions?
For projects requiring better insulation, hollow sheets are usually suitable because of their hollow structure. For outdoor projects requiring higher impact resistance, solid sheets can be considered. Corrugated sheets should be selected after structural and snow-load checks.
Q4. Which polycarbonate sheet is suitable for coastal and windy areas?
For coastal and windy areas, sheet thickness alone is not enough. Solid sheets, hollow sheets and corrugated sheets can all be used when the support spacing, profiles, fasteners and fixing points meet the local wind-load requirements.
Q5. Is a thicker polycarbonate sheet always better?
No. Thickness is important, but the correct specification also depends on panel size, internal structure, support spacing, wind load, snow load, application and fixing system.
Contact Guoweixing
If you are looking for polycarbonate sheets for roofing, greenhouse, canopy, skylight, carport or industrial building projects, contact Guoweixing for specifications, samples, quotation, customized solutions or bulk order support. You can send an inquiry, submit the contact form or contact us directly by WhatsApp.
