Polycarbonate roof: advantages and disadvantages

Polycarbonate is a transparent material used for roofs, such as pergolas or greenhouses. Made from resin, it is highly resistant to impact and weathering.

This material allows natural light to pass through, making spaces under polycarbonate roofs very bright. Polycarbonate sheets come in a variety of shapes: honeycomb, solid, corrugated, and even abrasion-resistant for greater durability.

Sheet thicknesses generally range from 16 mm to 32 mm, depending on the intended use. When installing a polycarbonate roof on a pergola or carport, choosing the right thickness is crucial to ensure longevity and resistance to climatic conditions.

With a 10-year manufacturer's warranty, polycarbonate panels are a reliable choice for protecting outdoor spaces while enjoying natural light.

Understanding polycarbonate

What is polycarbonate and how is it manufactured?

Polycarbonate is a highly resistant, transparent plastic. It is manufactured by a process known as extrusion. This process heats the plastic until it becomes malleable, then presses it through a die to create sheets or plates of different thicknesses.

Thanks to its thermoplastic nature, polycarbonate can be bent hot or cold without breaking, making it ideal for many uses, such as polycarbonate roofing or pergolas.

It can also be treated against UV rays, improving its resistance to yellowing and weathering.

The difference between cellular, solid and corrugated polycarbonate

Understanding the variety in polycarbonate roofs requires a close look at the characteristics of each type.

Each type of polycarbonate has its own characteristics, adapted to different needs. The choice will therefore depend on the specific project in terms of light demand, strength and aesthetics.

Comparison with other roofing materials (glass, PVC, tiles, etc.)

Polycarbonate offers a number of advantages when compared with other roofing materials such as glass, PVC or tiles.

This chart highlights polycarbonate's lighter weight and lower cost compared to glass, while offering better transparency than PVC and greater durability with proper treatment, unlike tiles which, while very durable, don't offer the same natural luminosity.

💡Moreresources on thermal control through the roof

Common uses for polycarbonate roofing

Polycarbonate roofs are often used for greenhouses. They let in natural light while protecting against UV rays. Pool enclosures also benefit from this lightweight, hard-wearing material.

Polycarbonate roofs are ideal for custom-made pergolas. They create pleasant outdoor spaces. Twin-wall polycarbonate sheets are robust and easy to install.

Users appreciate their light weight, which makes them easy to handle and assemble.

Pergolas and carports: lightness and light transmission

Polycarbonate pergolas and carports are appreciably lightweight. Installation is quick and easy. With a recommended thickness of between 16 mm and 32 mm, they guarantee strength and durability.

These structures let in soft, natural light. They embellish gardens, terraces and even small shops.

The modern look of aluminum pergolas with polycarbonate roofs attracts many homeowners. They also provide appreciable comfort during the warmer seasons.

Users enjoy a pleasant space without the unpleasant effects of heat, while being protected from the rain.

Greenhouses, conservatories and garden sheds

Polycarbonate is easily adapted to greenhouses, verandas and garden sheds. Its light weight makes it easy to build. Its 32 mm thickness provides good thermal insulation.

This material is weather-resistant to snow and hail. Users benefit from natural light thanks to its transparency. Choosing a polycarbonate roof creates a pleasant, light-filled space.

For effective installation, it's essential to provide a solid support and suitable fixings. Remember to treat all joints to ensure watertightness. Use micro-scratch-resistant polycarbonate to ensure the longevity of your structure.

Use protective films to preserve the polycarbonate's appearance over time.

Secondary roofs or annexes (awnings, lean-tos, etc.)

Secondary roofs, such as awnings or lean-tos, offer many advantages. They offer a good solution for protecting your outdoor spaces. When you use polycarbonate, you benefit from a lightweight, durable roof.

This material stands up well to weather and dirt. Installation is quick and easy, reducing construction costs.

Polycarbonate structures also let in plenty of light. They let in light while filtering out UV rays. So your space stays bright, even under an awning.

Polycarbonate roofing can be used for a variety of purposes. Whether for a pergola or a garden shed, polycarbonate is easy to integrate. Benefit from good value for money and enhance your home with an efficient, aesthetically pleasing roof.

Advantages of a polycarbonate roof

Polycarbonate roofs offer many advantages. Its light weight makes it easy to handle and install. It also reduces labor costs. High impact and weather resistance ensure optimum durability.

This material can withstand harsh weather conditions.

High natural light transmission reduces the need for artificial lighting. Enjoying sunlight makes spaces more pleasant. Polycarbonate enables a variety of aesthetic designs for different buildings.

Sheets are available in various thicknesses, such as 4 mm, with prices starting from 9€/m². This economical choice offers real advantages for all projects.

Lightweight and easy to install

Polycarbonate weighs around 1.5 kg/m², making it very light. This lightness facilitates handling and reduces labor costs. Installers appreciate its easy handling.

They can quickly install it on lightweight structures such as pergolas or carports. This speed of installation saves time, while maintaining the necessary strength.

Polycarbonate parts fit together easily, without the need for complex supports. It's a practical choice for those looking to optimize their roofing project.

Impact, UV and weather resistance

Polycarbonate roofs are highly impact-resistant. It stands up well to bad weather, even heavy rain or hail. This material protects against UV rays, guaranteeing high durability.

It is also resistant to temperature variations. A polycarbonate roof can last for many years without loss of performance. Its robustness makes it an ideal choice for different types of construction.

Users often appreciate its effectiveness in difficult climatic conditions.

Translucency and natural light

The translucency of the polycarbonate roof floods living areas with natural light. This property reduces the need for artificial lighting during the day.

It also improves energy efficiency. Conservatories and greenhouses in particular benefit from this luminosity.

To avoid glare, opt for treated sheets that diffuse light. Solar films can also help control light intensity. These solutions preserve comfort while maintaining a bright environment.

Disadvantages to be aware of before choosing

Polycarbonate does have its drawbacks. This material offers less protection than opal panels. This can be a problem for a terrace exposed to a lot of sunlight.

Its sensitivity to scratches requires surface treatment to prevent wear. Another risk is long-term discoloration with exposure to the sun.

Temperature variations often cause polycarbonate to expand and contract. Roof joints must be well sealed to prevent water leaks. In comparison, polycarbonate is less insulating than other materials, such as glass.

This limited sound insulation can be a disadvantage, depending on the intended use.

Limited thermal and sound insulation

Polycarbonate offers limited thermal and sound insulation. This material does not protect as well as double glazing. Outside noise easily penetrates polycarbonate sheets.

For a permanent dwelling, this feature can be disturbing. On the other hand, for a temporary shelter such as an aluminum pergola with a polycarbonate roof, it may suffice.

Those seeking to reduce noise pollution should consider higher-performance alternatives.

Transparent panels also let in more heat on sunny days. This means that the interior can become very hot. For sun-exposed terraces, opting for opal panels could offer better protection.

Users should assess their insulation needs before choosing their roof.

Sensitivity to scratches and thermal expansion

Polycarbonate panels are sensitive to scratches. They offer inadequate protection against scratches, especially when exposed to strong sunlight. Opal panels offer better resistance than transparent ones.

Poor installation aggravates the problem. An anti-scratch treatment is useful.

Thermal expansion also affects these roofs. Temperature variations can cause deformation. This requires floating installation to avoid long-term problems.

Choosing the right roof will help preserve the product's lifespan. A professional can help avoid these problems during installation.

Aging and yellowing possible without anti-UV treatment

Aging of polycarbonate roofs can be a problem. Without anti-UV treatment, these panels can yellow over time. This yellowing affects the aesthetics and transparency of the structures.

It often becomes visible after a few years, reducing the visual appeal of a pergola or garden shed.

Manufacturers offer warranties on UV treatments at the time of purchase. These warranties are important, as they protect against this type of deterioration. Regular maintenance also helps prevent yellowing.

Choosing the right product is crucial to the longevity of your polycarbonate roof.

Criteria for choosing a polycarbonate roof

When choosing a polycarbonate roof, you need to consider a number of criteria. These will help you make an informed choice.

• The thickness of the sheet is essential. Recommended thicknesses range from 16 mm to 32 mm. Opt for 32 mm for better insulation.
• The structure of polycarbonate affects its performance. Honeycomb panels are lightweight and offer good light transmission. Compact versions offer greater impact resistance.
• Check the light transmission index. A high value guarantees optimum natural light. This means you can light your spaces without electricity, especially in pergolas.
• A good anti-UV treatment is vital. It protects against yellowing and prolongs the durability of the sheets. Look for products specifically designed to block harmful rays.
• Make sure your roof is suitable for its intended use. Evaluate the local climate and orientation of your installation to maximize efficiency.
• Keep aesthetics in mind when making your choice. The anthracite 7016 color with structured finish gives your project a modern look.
• Check compatibility with the existing support. Aluminum or PVC structures must adapt easily to the plates chosen.

These criteria will ensure a wise choice for your future polycarbonate roof.

Thickness and structure (alveolar, solid, etc.)

Polycarbonate comes in several thicknesses. You'll find sheets in thicknesses of 4 mm, 6 mm, 8 mm, 10 mm, 16 mm, 25 mm and 32 mm. Each thickness has its own advantages, depending on use.

For example, 4 mm sheets are suitable for light projects such as greenhouses. Thicknesses from 10 mm to 32 mm provide better insulation and strength.

The structure of polycarbonate also plays an important role. Twin-wall sheets offer lightness and good light transmission. They are ideal for pergolas and carports.

Solid sheets, on the other hand, offer greater strength for secondary roofs. The choice of sheet should therefore depend on your needs and expectations in terms of performance and aesthetics.

Light transmittance and UV protection

The light transmission index (TL) measures the percentage of light that passes through the panel. A high TL in polycarbonate panels allows a large amount of natural light to enter.

This reduces the need for artificial lighting and creates a luminous space. Transparent panels let in a significant amount of light, while opal panels offer better solar protection.

Anti-yellowing treatment is crucial to prolonging the durability of polycarbonate roofs. Without this treatment, panels can yellow over time under the effect of UV rays.

This affects not only aesthetics, but also the material's light performance. Choosing polycarbonate panels with this treatment guarantees optimum luminosity for longer.

Compatibility with use (climate, orientation, aesthetics)

Choose your polycarbonate roof according to your climate. For warmer regions, a 32 mm thickness offers better thermal insulation. On the other hand, colder areas can opt for thicknesses between 16 mm and 32 mm.

This ensures lightness and strength. You should also consider the orientation of your structure. A well-oriented pergola captures natural light and reduces humidity.

Aesthetics play a crucial role in your choice of roof. Polycarbonate comes in a range of finishes, such as anthracite gray 7016 structured. This material blends easily with different architectural styles.

By integrating lighting elements, such as LED lights, you can create a warm atmosphere. In this way, you can maximize the potential of your outdoor space, while taking into account local specificities.

Tips for installation and fitting

Installing a polycarbonate roof requires preparation. Follow these tips for a successful project.

• Prepare the structure with a suitable slope. This will allow rainwater to run off properly.
• Use a solid, stable support to ensure the roof's durability. This will help support the weight of the plates.
• Choose suitable fasteners to secure the plates in place. Screws must be weather-resistant.
• Make sure joints are watertight. The use of silicone sealant can prevent water leaks.
• Treat sheet ends to prevent water infiltration. This will protect your roof from potential damage.
• Take thermal expansion into account during installation. A certain margin must be left to avoid any deformation of the sheets.
• Twin-wall sheets are recommended for their strength and lightness. They also offer good light transmission.
• Check the installation regularly after installation. Make sure nothing moves after every storm or rainstorm.

These steps guarantee efficient, long-lasting installation of your polycarbonate roof, like those used in pergolas and carports.

Preparing the structure (slope, support, suitable screws)

To install a polycarbonate roof, start by checking the minimum slope. A 5% slope is often recommended. This allows water to run off properly and prevents stagnation.

Next, make sure the support is solid. Use a sturdy aluminum or wooden frame to guarantee the structure's stability.

Choose the right screws to hold the panels in place. Special polycarbonate screws are available. They prevent leaks and ensure a secure hold.

Take the time to prepare your structure properly. This will reduce the risk of errors when installing your new polycarbonate roof.

Sealing joints and treating ends

Watertight joints are essential to the durability of your polycarbonate roof. Aluminum profiles, such as the H and U models, play a crucial role.

They tighten the edges of the sheets and prevent water from seeping through. Using the right adhesives helps reinforce this watertight seal.

Treating the ends also secures your structure. Apply a watertight seal to prevent infiltration. This protects against the elements, especially in winter.

Make sure every joint is properly sealed. This extends the life of your polycarbonate roof and preserves its appearance.

Installation precautions for thermal expansion

Thermal expansion is a vital factor when installing a polycarbonate roof. This material expands and contracts with temperature variations. It's essential to allow sufficient expansion space to avoid warping or cracking.

Use oblong holes for screws. This allows the polycarbonate to move freely.

A margin of 5 to 10 mm is generally recommended between sheets and fixed structures. This distance varies according to panel dimensions. In hot weather, make sure the sheets have room to spread out.

Neglecting these precautions can lead to problems such as yellowing or premature aging.

Maintenance and longevity of polycarbonate roofing

To maintain a polycarbonate roof, clean it regularly. Use suitable products to avoid damaging the sheets. Check for leaks at least once a year.

This will prevent water leaks.

To guarantee strength and durability, sheets should be between 16 mm and 32 mm thick. Thanks to their UV protection, these roofs can last a long time.

A 10-year warranty is often offered to secure your investment.

Regular cleaning and suitable products

Cleaning polycarbonate roofs is simple. It should be done regularly, ideally twice a year. Use mild products such as neutral soap and a microfiber cloth.

These materials guarantee the clarity of the panels. Avoid aggressive cleaners, as they can damage the surface. Good maintenance preserves the durability and aesthetics of your roof.

Choose a suitable maintenance kit to make this task easier. With these precautions, your polycarbonate roof will remain beautiful and functional.

Frequency of waterproofing checks

Check the watertightness of your polycarbonate roof often. Check after every winter or major hail storm. These can cause hidden damage.

Make sure all joints remain intact. Think about the ends and joints, too. A little preventive maintenance can avoid big problems later on.

Use the right products when cleaning to extend the life of your roof. Keep an eye out for signs of aging. Treat tarnished or micro-cracked areas promptly.

Regular maintenance ensures optimum natural light and preserves the aesthetic appearance of your installation, such as an aluminum pergola with a 32mm polycarbonate roof.

How to treat micro-cracks or tarnished areas

Treating micro-cracks and tarnished areas on a polycarbonate roof is essential to maintain its appearance. You can use a protective resin to restore the surface.

This product forms a layer over the polycarbonate and protects against scratches. A specially formulated polish can also restore shine.

For a more thorough renovation, or to completely change the look of your roof, you may consider repainting it. Consult our detailed guide on how to paint polycarbonate, to find out about suitable products and application steps.

If the micro-cracks are too numerous, consider a partial replacement of the damaged sheets. Generally speaking, if more than 10% of the surface is flawed, it's time to think about replacement.

Proper maintenance ensures the longevity of your polycarbonate roof and preserves its natural luminosity.

Alternatives and recent innovations

Treated polycarbonate offers new functionalities. Anti-heat and anti-condensation options are available. These innovations enhance interior comfort. Solar films also provide additional protection.

They block UV rays while allowing light to pass through.

Hybrid roofs combine polycarbonate and solar panels. This optimizes energy use without sacrificing brightness. These developments are attracting the attention of efficiency-seeking customers.

This makes the polycarbonate aluminum pergola an even more attractive option.

Anti-heat or anti-condensation treated polycarbonate

Heat-treated polycarbonate offers significant advantages over standard polycarbonate. These panels improve thermal comfort under the roof. They reduce heat build-up.

This results in a more pleasant indoor temperature, especially in regions with high sun exposure.

These panels maintain good luminosity while limiting glare. They also help prevent condensation, improving the durability of structures.

By using treated polycarbonate, you can cut your energy costs, as it reduces the need for air conditioning. This makes the material a top-of-the-range solution for roof-top pergolas and other outdoor constructions.

Solar films or transparent protective resins

Solar films and transparent protective resins offer excellent options. These products enhance the performance of a polycarbonate roof. Solar films reduce interior heat.

They also filter UV rays, protecting the material.

Transparent resins reinforce the surface. They protect against scratches and wear. These solutions maintain optimum clarity. Ideal for roofed pergolas and garden sheds.

Installation is quick and easy. So you can enjoy your outdoor space without worry.

Hybrid roofs: polycarbonate + solar panels

Hybrid roofs combine polycarbonate and solar panels. This combination offers two advantages. On the one hand, the polycarbonate ensures optimum light. On the other, solar panels generate energy.

This system provides shade while generating savings.

Many private customers choose this solution for their pergolas or carports. Polycarbonate's light weight makes it easy to install. What's more, this material is impact and weather resistant.

In a modern setting, this innovation is attracting increasing attention. Hybrid roofs are an option to be seriously considered for those wishing to combine aesthetics and energy efficiency.

Complementing these technical solutions, another method of protecting roofs against heat is gaining in popularity: Cool Roof.
This technique involves applying white reflective paint to roofs to reduce the temperature inside buildings.
👉 F ind out how Cool Roof works, its benefits and limitations in our comprehensive guide.

Conclusion

The polycarbonate roof proves to be a versatile solution for a variety of projects. It's ideal for pergolas, greenhouses and conservatories. It offers excellent light transmission, while being lightweight and durable.

To maximize its durability, good maintenance is essential. Tailor your choice according to use to get the best out of it.

FAQ

1. What is a polycarbonate roof?

A polycarbonate roof is a type of roof made from aluminum profiles and 32mm-thick polycarbonate sheets. It is often used in France for its strength and ability to let light through.

2. What are the advantages of a polycarbonate roof?

The advantages of a polycarbonate roof include its acoustic resistance, its structured anthracite gray 7016 finish, and its ability to be custom-built. Delivery is free in mainland France.

3. What are the disadvantages of a polycarbonate roof?

Although the polycarbonate roof is opaque and lets LED light through, some users have expressed negative opinions on the forum about the height of the posts and the diameter of the PVC.

4. Is the polycarbonate roof available in other colors?

Yes, although the anthracite gray 7016 structured finish is the most common, there are other color options available on request.

To find out more :

• Understanding Plexiglas insulation with anti-heat film
  
  
• Polycarbonate: resin application for UV protection