Fibreglass vs Polycarbonate: Which Is the Better Choice?

Selecting the right roofing material can make a huge difference to how comfortable, bright, and durable your outdoor or semi-outdoor space is. If you’re currently in the market for new roofing, chances are fibreglass roofing sheets and polycarbonate roofing are two of the options being weighed up. In 2026, these materials are among the most popular options across Australia for patios, pergolas, carports, verandahs, and walkways.

While they may look similar at first glance, fibreglass and polycarbonate perform very differently in real-world conditions. Understanding those differences will help you choose a solution that suits your climate, budget, and long-term expectations.

What Is Fibreglass Roofing?

Fibreglass roofing sheets are made from layers of glass fibres bonded together with resin. They have been used in construction for decades, particularly in industrial and agricultural settings.

Fibreglass sheets are commonly selected for their strength and light-diffusing properties. They allow natural light through while still offering a level of shade.

Key features of fibreglass roofing

Strong and impact resistant
Allows light transmission
Typically more affordable upfront
Commonly used in sheds, factories, and warehouses

At Roofing Options , fibreglass roofing is available in industrial-grade profiles designed for durability and coverage, making it suitable for large roof spans and functional structures.

What Is Polycarbonate Roofing?

Polycarbonate roofing is a modern, lightweight plastic roofing material known for its clarity, UV protection, and flexibility. It is widely used in residential projects where both performance and appearance matter.

Polycarbonate roofing comes in a wide range of profiles, colours, and systems, from solid flat sheets to multiwall and corrugated options.

At Roofing Options, popular polycarbonate ranges include Laserlite, Ampelite, Palram Sunsky, Suntuf, and Sunlite Twinwall, each designed for specific applications and performance needs. You can explore the full range of polycarbonate roofing sheets available through our website to find a solution that suits your project.

Which Material Lasts Longer?

Fibreglass durability

Fibreglass is known for its strength and resistance to corrosion. However, over time, exposure to harsh UV rays can cause fibreglass sheets to:

Discolour or yellow
Become brittle
Lose some of their structural integrity

This is particularly relevant in Australian conditions, where high UV exposure can accelerate ageing.

Polycarbonate durability

Polycarbonate is engineered for long-term outdoor performance. High-quality polycarbonate sheets:

Are highly impact resistant
Resist cracking and splitting
Include UV-protective layers that slow degradation

Many polycarbonate products available through Roofing Options are designed specifically for Australian conditions and come with strong manufacturer warranties, making them a reliable long-term investment.

Verdict: Polycarbonate generally outperforms fibreglass when it comes to long-term durability and UV resistance.

Light Transmission and Comfort

Natural light is one of the main reasons people choose translucent roofing materials. However, not all light transmission is equal.

Fibreglass and light diffusion

Fibreglass roofing allows light through but tends to scatter it unevenly. Over time, surface wear and discolouration can reduce light quality, making spaces feel dull or patchy.

Polycarbonate and controlled daylight

Polycarbonate roofing offers more control over light and heat. Depending on the product, you can choose sheets that:

Let in bright natural light
Reduce glare
Block harmful UV rays
Minimise heat build-up

For example, polycarbonate options such as Ampelite Solasafe or Sunsky are designed to balance daylight with thermal comfort, making them ideal for patios and pergolas.

If bringing more daylight into your space is a priority, we also explore this in a blog on top roofing ideas to let in the daylight.

Thermal Expansion and Installation Considerations

One of the most important technical differences between fibreglass and polycarbonate is how they respond to temperature changes.

Fibreglass movement

Fibreglass expands and contracts less than polycarbonate, which can make installation feel more forgiving. However, incorrect fixing or aging sheets can still lead to cracking.

Polycarbonate movement

Polycarbonate expands and contracts more significantly with temperature changes. This is not a flaw, but it does mean:

Correct fixing methods are essential
Expansion gaps must be allowed during installation
Manufacturer installation guidelines should always be followed

We’ve covered this in detail in our article on thermal expansion and polycarbonate roofing, which is well worth reading before installation!

When installed correctly, polycarbonate performs exceptionally well and remains stable across seasonal temperature changes.

Appearance and Design Flexibility

Fibreglass appearance

Fibreglass tends to have a more utilitarian look. While suitable for industrial and agricultural uses, it may not deliver the visual finish many homeowners want for residential spaces.

Polycarbonate appearance

Polycarbonate offers far greater design flexibility. It is available in:

Clear, tinted, and opal finishes
Flat, corrugated, and multiwall systems
Modern architectural profiles

Products like Sunlite Twinwall provide a sleek, contemporary finish while improving insulation and comfort. Roofing Options also provides a helpful Sunlite Twinwall installation guide and tips for those considering this system.

Verdict: For residential and architectural projects, polycarbonate is usually the more attractive option.

Cost

Fibreglass cost considerations

Fibreglass sheets are often cheaper upfront, which can be appealing for large-scale or budget-conscious projects.

However, potential downsides include:

Shorter lifespan
Higher likelihood of replacement over time
Reduced visual appeal as sheets age

Polycarbonate cost considerations

Polycarbonate typically has a higher initial cost, but it often delivers better value over time due to:

Longer lifespan
Better UV protection
Improved comfort and aesthetics
Reduced maintenance and replacement needs

For homeowners planning to stay long-term, polycarbonate can be the more cost-effective choice overall.

Noise, Weather, and Everyday Performance

Australian weather can be unpredictable, so everyday performance matters.

Fibreglass performance

Fibreglass handles rain and wind well but can become noisy during heavy rainfall. Over time, surface wear may also affect performance.

Polycarbonate performance

Polycarbonate roofing is designed for high-impact resistance and consistent performance. Multiwall systems can also help:

Reduce rain noise
Improve insulation
Create a more comfortable space year-round

This makes polycarbonate particularly suitable for outdoor living areas attached to the home.

Which Roofing Material Is Right for Your Project?

Choosing between fibreglass and polycarbonate depends on how you plan to use the space.

Fibreglass may suit you if:

You are working on an industrial or agricultural project
Budget is the main concern
Aesthetic finish is less important

Polycarbonate may suit you if:

You want a brighter, more comfortable living space
Long-term durability matters
You value modern design and UV protection
You are building a patio, pergola, or carport for everyday use

Did you know that we stock a wide range of polycarbonate roofing systems, fibreglass sheets, fixings, and accessories, making it easy to compare options and get expert advice.

Get Expert Advice and Custom Solutions from Roofing Options

There is no one-size-fits-all answer, but for most residential applications, polycarbonate roofing offers superior comfort, durability, and design flexibility. Fibreglass still has its place in industrial and utility-focused projects, but when performance and appearance matter, polycarbonate is often the better choice.

If you are deciding between fibreglass and polycarbonate roofing, our team is here to help. Get expert advice, explore a wide range of roofing products, and find the right solution for your project.

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