Robust thermal insulation for your roof
The multiwall polycarbonate 20 mm sheet is a high-strength, UV-protected glazing material designed for energy-efficient roofs and daylight surfaces. Its 7WALL structure creates a dense, insulating barrier that helps maintain stable temperatures in your building throughout the year.
This opal-tinted board is an excellent choice when you need to reduce heat loss while allowing soft, natural light to filter through. It is a reliable, long-lasting option for projects where thermal performance is the top priority.
Technical specifications
- Brand: Arla Plast
- Type: Multiclear 7WALL
- Thickness: 20 mm
- Mass: 2800 g/m²
- U-value: 1.6 W/m²*K
- UV protection: 1 side standard
- Colour: Opal
Why choose this 20 mm variant
When you are building in colder climates, thin glazing can lead to significant heat loss. This 20 mm sheet provides the extra thickness needed to keep your space warmer and more energy-efficient.
The opal finish is particularly effective at diffusing harsh sunlight, preventing glare and creating a pleasant, even light distribution inside your greenhouse or terrace shelter.
Installation and compatibility
These boards are custom-cut to your specific measurements, making them suitable for both new builds and replacement projects. Ensure your support system is designed to accommodate the 20 mm thickness for a secure fit.
We recommend using sealing tapes to protect the channel ends from moisture. If you need a thinner option for lighter structures, consider our 16 mm clear sheet.
Important information
- 10-Year Warranty Covers discoloration caused by weather, as well as loss of impact resistance and light transmission.
- Color Variations Color shades of multiwall sheets can vary by up to 8% between different production batches. We recommend ordering all sheets for a single project at the same time to ensure a consistent color.
- Cutting Tolerance The maximum allowable cutting deviation on the edges is 4 mm.
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- Internal Structure The internal design (channels shape) of the sheets may vary based on stock levels, but the technical specs are identical. We never mix different structures in the same order to ensure a uniform look.
- UV Protection & Installation Polycarbonate sheets must be installed with the UV-protected side facing up (facing the outside) for the protection to work. The UV side is clearly marked on the protective film.
- Handle with Care Handle the sheets carefully to prevent scratches and damage.
- Storage Store in a cool, dry place away from direct sunlight.
Use cases and compatibility
Choose this 20 mm sheet when thermal efficiency is your primary requirement for terrace roofs, industrial daylight surfaces, or greenhouses located in colder climate zones.
Select a thinner option like our 16 mm clear sheet if your existing support structure cannot accommodate the 20 mm thickness or if you require maximum light transmission.
Ensure your rafter spacing and support system are specifically designed to handle the weight and thickness of 20 mm boards to maintain long-term structural integrity and safety.
