Multiwall Polycarbonate Sheets

Multiwall polycarbonate sheets are widely used across the UK for outdoor roofing and glazing projects. Their lightweight, chambered construction makes them suitable for a range of domestic, DIY, and light-commercial applications, including pergolas, canopies, conservatories, garden rooms, carports, lean-to roofs, and covered walkways.

At polycarbonatex.co.uk, we supply Corotherm multiwall polycarbonate sheets in a variety of thicknesses, colours, and finishes, along with compatible accessories for complete roofing systems.

What Are Multiwall Polycarbonate Sheets?

Multiwall polycarbonate sheets are manufactured with multiple internal chambers (also known as flutes). This design contributes to:

• Sheet rigidity

• Reduced weight compared to solid plastic or glass

• Varying levels of light control depending on finish

• Improved thermal characteristics compared to single-skin sheeting

This combination makes multiwall polycarbonate a practical material for outdoor structures where both light and coverage are required.

Sheet Thickness Options and Typical Uses

4mm & 6mm Polycarbonate Sheets

Commonly used for:

• Greenhouses

• Cold frames

• Small canopies

• Lightweight DIY projects

10mm Polycarbonate Sheets

Often chosen for:

• Pergolas

• Carports

• Canopies

• Walkways

16mm Polycarbonate Sheets

Frequently used for:

• Garden rooms

• Conservatory-style roofing

• Larger pergolas

25mm Polycarbonate Sheets

Typically used for:

• Higher-insulation applications

• Conservatories

• Enclosed garden room structures

Thicker sheets generally provide deeper internal chambers, which influence rigidity and thermal characteristics.

Colour and Finish Options

Clear Polycarbonate

• High levels of natural light

• Suitable where maximum daylight is preferred

Opal Polycarbonate

• Diffused light

• Reduced brightness

• Suitable for seating areas or south-facing roofs

Bronze / Bronze Opal

• Tinted appearance

• Lower light levels compared to clear finishes

Heat-Reflective Finishes

• Designed to reflect a portion of solar energy

• Often used in conservatories and garden rooms

These finish options allow you to select the level of brightness and shading that suits your space.

Common Uses for Multiwall Polycarbonate Roofing

Multiwall polycarbonate sheets are widely used for:

• Pergolas and patio covers

• Canopies and lean-to roofs

• Carports

• Covered walkways

• Conservatories and garden rooms

• Light-commercial shelters

Their lightweight construction and range of thicknesses make them adaptable for different outdoor structures.

Installation Considerations

To achieve a suitable installation, it is important to follow manufacturer and system guidelines.

Key principles include:

• Allowing for sheet expansion

• Installing with the UV-protected face outward

• Using compatible glazing bars and fixings

• Sealing open flutes with breather tape (bottom) and solid tape (top)

• Finishing with appropriate end closures and flashings

Correct installation helps support the durability and appearance of the roofing system.

Accessories for a Complete System

We supply compatible components designed for use with multiwall polycarbonate sheets:

• Glazing bars

• Breather and aluminium tapes

• End closures

• Side flashings

• Wall flashing tape

• Fixing buttons

Using matched accessories helps maintain compatibility across the roofing structure.

Multiwall Polycarbonate Compared to Glass

Multiwall polycarbonate is often selected over glass due to:

• Its lighter weight

• Ease of handling and installation

• Variety of light-control options

• Chambered structure for thermal characteristics

These factors can make it a practical option for many DIY and trade installations.

Care and Maintenance

Polycarbonate sheets typically require minimal routine maintenance, such as:

• Occasional cleaning with mild detergent

• Removal of surface debris

• Periodic checks of fixings and seals

This helps maintain appearance and performance over time.

Why Buy from polycarbonatex.co.uk?

• UK-based retailer

• Corotherm multiwall polycarbonate sheets

• Matching accessories available

• Clear product specifications

• Nationwide UK delivery

• Suitable for both DIY and trade customers

Support is available if you need help selecting sheet thicknesses, finishes, or compatible accessories.

Frequently Asked Questions

Are multiwall polycarbonate sheets suitable for UK installations?
Multiwall polycarbonate is commonly used for outdoor structures across the UK and is supplied with a UV-protected external surface.

Which thickness should I choose?
10mm and 16mm sheets are common for pergolas and carports, while 16mm and 25mm are often used for garden rooms and conservatory-style roofs.

Do the sheets have UV protection?
Corotherm sheets include a UV-treated outer face designed for external installation.