When choosing roofing sheets for a pergola, lean-to, carport, canopy or garden structure, two of the most common materials are polycarbonate and PVC roofing sheets. Both are lightweight, easy to install and suitable for outdoor use, but they differ significantly in strength, durability, lifespan and overall performance.

In this guide, we compare polycarbonate and PVC roofing sheets to help you choose the best option for your project.

Helpful resources mentioned throughout this guide:

Multiwall polycarbonate accessories
https://polycarbonatex.co.uk/collections/multiwall-accessories

Cut-to-size polycarbonate sheets
https://polycarbonatex.co.uk/products/cut-to-size-multiwall-polycarbonate-sheet

Glazing bar end caps
https://polycarbonatex.co.uk/collections/multiwall-accessories/products/corotherm-multiwall-polycarbonate-sheet-glazing-bar-end-cap

Delivery policy
https://polycarbonatex.co.uk/pages/delivery-policy

What Are Polycarbonate Roofing Sheets?

Polycarbonate roofing sheets are strong, impact-resistant panels commonly used for pergolas, verandas, lean-to roofs and carports.

Most modern systems use multiwall polycarbonate, which contains internal air chambers that improve insulation while maintaining strength.

Polycarbonate sheets are known for:

• High impact resistance
• Lightweight construction
• UV protection
• Long lifespan
• Good insulation properties

They are often installed using glazing bars and compatible accessories.

Browse accessories here:

https://polycarbonatex.co.uk/collections/multiwall-accessories

What Are PVC Roofing Sheets?

PVC roofing sheets are typically corrugated plastic sheets used for:

• Sheds
• Garages
• Agricultural buildings
• Basic outdoor shelters

PVC sheets are lightweight and affordable, making them suitable for simple applications.

However, they do not offer the same performance as polycarbonate.

Strength and Durability

One of the biggest differences between polycarbonate and PVC is strength.

Polycarbonate sheets are extremely impact resistant and designed to withstand outdoor conditions.

They can handle:

• Falling debris
• Hail
• Strong winds
• Everyday wear and tear

PVC sheets are less impact resistant and more prone to cracking under pressure or impact.

Over time, PVC sheets may become brittle, especially when exposed to sunlight.

Lifespan Comparison

Polycarbonate sheets are designed for long-term use and can last many years when installed correctly.

PVC sheets typically have a shorter lifespan and may degrade over time due to UV exposure.

This can result in:

• Discolouration
• Brittleness
• Reduced strength

For long-term roofing solutions, polycarbonate is generally the more durable option.

Light Transmission

Both materials allow light to pass through, but there are differences in clarity and appearance.

Polycarbonate sheets are available in:

• Clear
• Opal
• Bronze

These options allow you to control brightness and reduce glare.

PVC sheets are usually available in clear or tinted versions but often provide less consistent light quality over time.

Insulation Performance

Multiwall polycarbonate sheets provide better insulation than PVC sheets due to their internal air chambers.

These air pockets help:

• Reduce heat loss
• Improve temperature control
• Create a more comfortable covered space

PVC sheets are typically single-layer and provide minimal insulation.

Ease of Installation

Both materials are relatively easy to install, but polycarbonate systems often provide a more structured and secure installation.

Polycarbonate sheets are installed using glazing bars and accessories, which help create a watertight system.

PVC sheets are often fixed directly to the structure using screws and washers.

While this can be quicker, it may not provide the same long-term reliability.

Weather Resistance

Polycarbonate performs extremely well in outdoor environments.

It offers:

• UV protection
• High resistance to impact
• Strong weather durability

PVC sheets can perform well initially but may degrade over time when exposed to sunlight and changing weather conditions.

Cost Comparison

PVC sheets are generally cheaper than polycarbonate sheets.

This makes them suitable for:

• Temporary structures
• Low-cost projects
• Agricultural buildings

Polycarbonate sheets may cost more initially but offer better long-term value due to their durability and performance.

Noise and Comfort

Polycarbonate roofing can be quieter than PVC, especially when using thicker multiwall sheets.

PVC sheets can sometimes amplify noise during rain due to their thinner structure.

Choosing thicker polycarbonate sheets can help reduce noise levels and improve comfort.

Maintenance Requirements

Both materials require basic maintenance such as cleaning and occasional inspection.

Polycarbonate sheets should be cleaned using warm soapy water and a soft cloth.

Accessories such as glazing bars and end caps should also be checked regularly.

Replacement glazing bar end caps can be found here:

https://polycarbonatex.co.uk/collections/multiwall-accessories/products/corotherm-multiwall-polycarbonate-sheet-glazing-bar-end-cap

PVC sheets also require cleaning but may need replacing sooner due to wear.

Which Roofing Material Is Best?

Polycarbonate is generally the better choice for:

• Pergolas
• Lean-to roofs
• Verandas
• Carports
• Patio covers

PVC sheets may still be suitable for:

• Sheds
• Temporary structures
• Low-budget projects

For most residential outdoor structures, polycarbonate provides better strength, durability and long-term performance.

Ordering Polycarbonate Sheets

Many homeowners choose cut-to-size polycarbonate sheets to simplify installation.

Cut-to-size sheets ensure the correct dimensions and reduce waste.

Order cut-to-size sheets here:

https://polycarbonatex.co.uk/products/cut-to-size-multiwall-polycarbonate-sheet

Delivery information can be found here:

https://polycarbonatex.co.uk/pages/delivery-policy

Accessories for a Complete Roofing System

A complete polycarbonate roofing system includes:

• Glazing bars
• Breather tape
• Aluminium sealing tape
• End closures
• Drip trims

Using compatible accessories ensures the roof is watertight and properly ventilated.

Browse accessories here:

https://polycarbonatex.co.uk/collections/multiwall-accessories

Conclusion

Polycarbonate and PVC roofing sheets both have their uses, but they are designed for different types of projects. PVC sheets are a cost-effective option for simple or temporary structures, while polycarbonate offers superior strength, durability and long-term performance.

For pergolas, lean-to roofs and garden structures, polycarbonate is often the preferred choice due to its reliability and weather resistance.

With the right materials and installation, a polycarbonate roof can provide years of dependable performance and protection.