By Intura, 28 august 2025

Walkable glass on your roof terrace

Intura PGX A5 walk-on glass: everything you need to know about natural light on your roof terrace

What if your roof terrace didn’t have to be the reason the room below is plunged into darkness? Many homeowners struggle with the choice between a functional outdoor space and sufficient natural light in their home. Perhaps you recognise this dilemma: you want to make the most of those extra metres on top of your house, but you’re worried about glass becoming slippery when it rains or the risk of it breaking. What’s more, you don’t want a skylight to compromise your home’s insulation, especially given current energy prices.

With Intura PGX A5 walkable glass, you’re choosing a solution that makes these concerns a thing of the past. In this article, you’ll discover how this innovative flat-roof window allows you to walk safely across your skylight whilst enjoying maximum natural light in the room below. We explain how the unique anti-slip texture and the excellent insulation value of U_w = 0.99 W/m²K contribute to a comfortable and safe living environment that fully complies with the requirements of the Building Environment Decree (Bbl). You’ll get a clear overview of the technical specifications and the sustainability benefits of this Dutch design, so that your roof terrace and interior finally form a single, seamless whole.

Key Points

Discover how to design a roof terrace where maximum natural light and functional walking space come together without sacrificing valuable floor space.
Learn why the Intura PGX A5 walk-on glass is a safe and energy-efficient solution, thanks to its special anti-slip texture and a U-value of 0.99 W/m²K.
Understand the key technical differences between walk-on glazing and standard flat roof windows to determine the right investment for your home.
Get practical tips for seamlessly integrating the glass into your terrace floor, including essential considerations for effective drainage.
Discover the benefits of a complete turnkey system, including an insulated upstand, for a durable and professional finish to your roof terrace.

What is the Intura PGX A5 and why choose walk-on glass?
Safety and thermal insulation: the technology behind the Intura PGX A5
The differences between walk-on glass and standard flat roof windows
Tips for integrating walk-on glass into your roof design
Transforming your roof terrace with Intura daylight solutions

What is the Intura PGX A5 and why choose walk-on glass?

Imagine your roof terrace no longer being interrupted by a glass dome that you have to walk around. That is precisely the problem that walk-on glass solves. Whereas a standard roof window takes up valuable square metres of your terrace, the Intura PGX A5 walk-on glass acts as a fully-fledged part of your floor. It is a technical masterpiece that combines the transparency of a window with the robustness of a structural floor. This allows you to create a modern, sleek look that makes an immediate impact both indoors and outdoors.

This system has been specifically designed to blur the boundary between your interior and your outdoor space. You no longer have to choose between a spacious terrace or a light-filled living room; with this solution, you get both. The design is understated and functional, in keeping with the Dutch architectural style where efficiency and quality go hand in hand. You transform a functional roof into a luxurious living environment without compromising the usability of your outdoor space.

This focus on a high-quality outdoor experience and sweeping views is also what makes a visit to Uto Staffel so special, allowing the surroundings to be shown off to their best advantage.

The benefits of natural light in your home

Natural light does more than simply illuminate a room. It has a direct impact on your wellbeing and productivity. People who spend time in spaces with plenty of daylight often feel more energetic and focused. There is also a practical benefit for your wallet. The strategic placement of a flat-roof window means you need less artificial light during the day, resulting in noticeable savings on energy bills in the long term. Visually speaking, daylight works wonders for the way a space is perceived; a previously dark room beneath a roof terrace immediately appears many times larger and more inviting.

Adding value to your roof terrace

One aspect that is often underestimated is the immediate increase in your property’s value. In the current Dutch housing market, every usable square metre of outdoor space is worth its weight in gold. By choosing the Intura PGX A5 walk-on glass, you optimise the use of your terrace without compromising on the amount of light entering the room below. The glass panel is constructed from multiple layers, including laminated safety glass, which ensures extremely high load-bearing capacity and safety.

The aesthetic integration is seamless. The glass sits almost flush with your terrace floor, creating a minimalist and luxurious look that fits perfectly with modern architecture. Potential buyers see this as a high-quality upgrade that demonstrates an eye for detail and comfort. It is not just any window, but a smart investment in your home’s market value. You can make the most of your roof terrace whilst the room below is bathed in light.

Safety and thermal insulation: the technology behind the Intura PGX A5

The technology behind the Intura PGX A5 walk-on glass goes far beyond simply a thick sheet of glass. Safety is the absolute priority for a product that you literally walk on. The composition of the glass is therefore extremely specific. With a robust glass structure, this window offers the necessary structural integrity. This means that the glass not only supports your weight but is also resistant to the dynamic forces of movement and a variety of weather conditions.

The design combines strength with finesse. After all, you don’t want a functional solution to detract from the appearance of your home. The combination of toughened and laminated glass creates a surface that can withstand heavy loads. This provides peace of mind when you’re entertaining guests on your roof terrace or when children are playing outside.

Anti-slip and scratch resistance explained

When it rains or snows, a smooth glass surface can quickly become a hazard. That is why the Intura PGX A5 features a special anti-slip texture. This texture ensures grip in all weather conditions without compromising the amount of light entering the room below. In addition, the top layer is scratch-resistant. Many people worry that walk-on glass will become covered in scratches over time from shoes or patio furniture. Intura’s scratch-resistant glass panel prevents this, ensuring the view remains clear for years to come. These technical requirements for safety and durability are closely linked to international building code safety standards for architectural glass.

Insulation values and energy efficiency

A common concern with large glass surfaces is heat loss. The Intura PGX A5 addresses this by offering an impressive U-value of 0.99 W/m²K. This figure indicates the total insulation value of the unit, including the frame and the reveal. The HR++ glass keeps the heat in during winter and keeps out the worst of the heat in summer. This keeps your energy bills under control and ensures optimum living comfort.

An essential part of this system is the 16 cm high, insulated plastic upstand. This construction is crucial for preventing thermal bridges. Without proper insulation at the edges, condensation forms and you lose valuable energy. This integrated approach ensures the indoor climate remains stable. Are you curious about the technical details for your specific situation? Then take a look at the specifications for the Intura PGX A5 walk-on glass for more information.

The differences between walk-on glass and standard flat roof windows

When designing a home with a flat roof, you’re often faced with a choice: do you go for a standard solution or opt for a specialised product? A comparison between the Intura PGX A1 and the Intura PGX A5 walkable glass makes this difference immediately clear. Whilst the PGX A1 is an excellent flat-roof window for maximum light and ventilation, this model is not designed to be walked on. The PGX A5, on the other hand, is a structural element that combines the strength of a floor with the transparency of high-quality glass.

The main difference lies in the glass construction and load-bearing capacity. A standard roof window often protrudes slightly above the roof surface and has a profile designed to drain water, but not to bear weight. The Intura PGX A5, on the other hand, is specifically designed to be integrated almost flush with the decking. This creates a sleek, aesthetic finish where the window does not act as an obstacle, but becomes a functional part of your outdoor space.

Load-bearing capacity and intended uses

It is a dangerous misconception that you can stand on any flat-roof window. Whilst a standard window such as the Intura PGX A1 does use safety glass, its thickness and frame are not designed to withstand point loads, such as a person walking across it. This can lead to dangerous situations and damage to the window frame. The Intura PGX A5 walkable glass has been specifically tested for these forces. The glass is considerably thicker and the structure has been reinforced to withstand intensive use on a roof terrace. Whether you walk across it to water the plants or place part of a lounge set on it, the structural integrity remains guaranteed.

Long-term value for money

Although the initial investment for walk-on glass is higher than for a standard skylight, this pays for itself in several ways. Consider the following aspects:

Space saving: You don’t lose any valuable square metres on your roof terrace because you don’t need to build around the window or install a railing.
Durability: The materials used for the PGX A5, such as the scratch-resistant top layer and the robust upstand, are resistant to the wear and tear associated with a walkable surface.
Maintenance: Unlike plastic domes, which can become dull over time, Intura’s high-quality glass retains its clarity and insulating properties.

In the long term, choosing walkable glass means opting for a solution that expands the potential uses of your home. You create a roof terrace that is truly complete, without compromising on safety or the amount of light entering the room below. It is a choice for quality that enhances the architectural value of your home.

Tips for integrating walk-on glass into your roof design

Integrating an Intura PGX A5 walk-on glass panel into your roof terrace requires a well-thought-out approach. It is not just about the technical installation, but above all about how the glass becomes a natural part of the living space. Successful integration ensures that you can enjoy your terrace without a second thought, whilst the room below makes the most of the natural light. Clever positioning is essential here; ideally, place the window above an area where you need light most during the day, such as a dining table, a dark hallway or a home office.

In addition to its position, the interaction with the roof surface is crucial. A flat roof always has a minimum angle of inclination to drain rainwater. It is advisable to position the walk-on glass so that water does not pool against the upstand, but flows directly away to the rainwater drain. This keeps the glass surface cleaner and prevents unnecessary dirt from accumulating at the edges, which extends the lifespan of the sealing materials.

Connection to decking

The 16 cm high insulated upstand of the PGX A5 forms the basis for the connection to your patio flooring. Whether you opt for wooden decking boards or ceramic tiles on tile supports, the aim is a seamless transition. With wooden decking, you can lay the boards right up to the edge of the glass. Always ensure there is a small gap to allow for the natural movement of the wood due to temperature changes. With tiles on underlay, it is easier to set the height exactly level with the top of the glass surface. This prevents the risk of tripping and creates that desired minimalist look where the indoors and outdoors visually blend into one another.

Sun protection and privacy

On hot summer days, a large glass surface can cause the indoor temperature to rise. Although the PGX A5, with its U-value of 0.99 W/m²K, provides excellent insulation, direct sunlight can still heat up the room beneath it. In such situations, you might consider adding internal sun protection. Think of electric pleated blinds that you can easily close when the sun is at its strongest. For spaces where heat control is the top priority and walkability is less relevant, the Intura PGX A9 with solar-control glass may be an alternative.

Privacy is another aspect to consider, particularly if the roof terrace is adjacent to taller buildings or if the room below is intended for private use. You can opt for glass with a matt finish or a subtle texture. This still allows a huge amount of daylight through, whilst preventing people from looking in directly from above or below. This way, you can enjoy your outdoor space and your light-filled interior with complete peace of mind. Are you ready to take your roof terrace to the next level? Then take a look at the various options for Intura PGX A5 walk-on glass and find the perfect match for your home.

Transform your roof terrace with Intura daylight solutions

The transformation of a roof terrace begins with choosing the right materials and a partner who combines expertise with reliability. When you choose the Intura PGX A5 walk-on glass, you’re choosing a system specifically developed to enhance the liveability of your home. It’s a long-term decision. In both renovation and new-build projects, it is essential that all components of the building envelope fit together seamlessly. Intura therefore supplies this flat-roof window as a complete system, including a 16 cm high insulated upstand. This all-in-one package guarantees rapid installation and optimal thermal insulation of your roof structure.

We understand that the technical aspects of walk-on glass may raise questions. That is why we offer comprehensive support with technical issues and specification texts. Our role is that of an expert guide who provides you with the necessary factual evidence. Whether it concerns calculating the light output or integrating the window into a specific terrace design, we work with you every step of the way, from the initial sketch to the final realisation. This transparent approach gives you the certainty you need when making a high-value investment in your home.

The quality of Intura

Intura’s core value is its focus on sustainable innovation. As a Dutch specialist in daylighting systems, we develop products specifically tailored to the requirements of modern architecture and the local climate. Our designs are characterised by a calm self-assurance; we let the performance of our products speak for itself. Professionals in the construction sector often choose Intura because of our experience with complex projects and the high quality of our materials. The Intura PGX A5 is an excellent example of this, with its scratch-resistant glass panel and robust construction ensuring a long-lasting, low-maintenance solution.

Ordering and advice

With us, the process of moving towards a brighter home is straightforward and focused. The first step is choosing the right size to suit your roof terrace and the space below it. In our documentation, you’ll find all the specifications you need to make an informed decision. Do you need personalised advice on the technical installation or the sun-shading properties of our glass? Our experts make complex matters accessible without losing sight of the essentials. We’re happy to help you make the most of your outdoor space and interior.

Are you ready to transform your roof terrace and enjoy a home filled with natural light? You can view the Intura PGX A5 in our online shop straight away to discover the various sizes and options. Choose a safe, sustainable and aesthetically pleasing solution that takes your living comfort to the next level.

Achieve the ideal balance between light and space

A roof terrace no longer has to come at the expense of natural light in your home. With Intura PGX A5 walk-on glass, you can create a safe outdoor space that flows seamlessly into your interior. You’re choosing a certified solution that’s not only safe to walk on but also offers the highest insulation value in its class, with a U-value of 0.99 W/m²K. Thanks to the durable plastic upstand, installation is efficient and you’re assured of a thermal bridge-free structure that will last for years.

Whether you’re designing a new roof terrace or renovating an existing space, walk-on glass is a smart investment in both living comfort and property value. You can make the most of every square metre of your terrace whilst the room below is bathed in natural daylight. Are you ready to take the next step towards a more modern and lighter living environment? Discover the Intura PGX A5 now and buy Now > to get your project started. Soon you’ll be enjoying a home where light and space finally come together.

Frequently asked questions about walk-on glass

Is it really safe to walk on the Intura PGX A5 glass?

Yes, you can walk on the Intura PGX A5 walkable glass in complete safety. This product has been specifically designed as a structural flooring element and meets the strictest safety standards for walkable glazing. The glass panel is constructed from multiple layers of toughened and laminated safety glass, which together provide enormous load-bearing capacity. As a result, the window is fully capable of withstanding the weight of adults and children playing on a roof terrace without any risk of breakage or dangerous situations.

Is walk-on glass slippery outdoors when it rains?

No, the glass is not slippery thanks to a special anti-slip texture incorporated into the top layer. This texture provides the necessary grip in wet weather conditions such as rain or snow. Unlike standard glass, which can become dangerously slippery when wet, the Intura PGX A5 offers a non-slip surface that prevents slipping. This makes it a safe choice for roof terraces where you want to be able to walk across it all year round without any worries, whatever the weather.

What is the maximum load capacity of the Intura PGX A5?

The Intura PGX A5 is designed to withstand a load suitable for intensive residential use on roof terraces. The structure has been tested to bear both a significant distributed load and point loads, such as people walking across it or the weight of terrace furniture. For specific projects with very high load requirements, we always recommend consulting the technical data sheets. This ensures that the window’s load-bearing capacity is perfectly suited to the intended use of your outdoor space.

How do I keep walk-on glass clean and scratch-free?

You can keep the glass clean by washing it regularly with water and a mild, non-abrasive cleaning product. Although the Intura PGX A5 walk-on glass is fitted with a scratch-resistant top layer, it is advisable to remove coarse dirt and sand promptly with a soft broom. Avoid using harsh chemicals or scouring pads, which can damage the anti-slip texture. This simple maintenance routine ensures the glass remains clear for years to come and that the surface retains its effective performance and attractive appearance.

Can the Intura PGX A5 be installed on any flat roof?

Yes, the Intura PGX A5 can be installed on virtually any flat roof, provided the underlying roof structure can support the unit’s weight. As walk-on glass is considerably heavier than a standard skylight, it is often advisable to have a structural engineer carry out an assessment for renovation projects. The unit comes complete with a 16 cm insulated upstand, which greatly simplifies its integration into most roof structures and insulation systems. This ensures a watertight and thermally sound connection to your roof.

Is there also a version of walk-on glass that can be opened for ventilation?

No, the Intura PGX A5 is available exclusively as a fixed, non-opening roof window. This is essential to ensure the structural integrity and safety required for a walkable surface. A moving mechanism would create a weak point in the floor structure and compromise watertightness under intensive use. For ventilation in the same room, you might consider installing an additional product, such as an openable Intura PGX A1 flat-roof window in another part of the flat roof.

What is the difference in insulation value between walkable glass and a dome?

The difference in insulation performance is significant in favour of the Intura PGX A5 compared with traditional domes. Whereas a standard dome often has a high U-value of over 2.0 W/m²K, the PGX A5 offers an excellent U-value of 0.99 W/m²K. This is due to the use of high-quality HR++ glass and the superior insulation of the plastic flashing. As a result, heat is retained much more effectively in winter, enabling you to make significant savings on your energy bills.

Do I need a special planning permission to install walk-on glass on my roof terrace?

Whether you need a planning permission depends on your local circumstances and whether you are officially changing the roof’s function to that of a roof terrace. Installing the glass itself is often exempt from planning permission when replacing existing glazing, but creating a new roof terrace usually requires an environmental planning permission. The Intura PGX A5 complies with the technical requirements of the Building and Living Environment Decree (Bbl), which simplifies the planning permission process. Always check with the Omgevingsloket for the regulations applicable to your specific address.