When you are looking for a roof window, you want to be sure that you invest in a product that is not only beautiful but also durable, safe, and energy-efficient. At LUMIZEN®, we understand that quality lies in the details. In this blog, we take you through the most important points to watch out for, so you can make an informed choice and select a roof window that offers both quality and durability.
1. The origin of the glass: a solid foundation
The core of every skylight is the glass. Not all glass is the same, and its origin plays a major role in quality. At LUMIZEN®, we work exclusively with glass from the most renowned producers in the world, such as Saint-Gobain, Pilkington, and AGC Japan. These companies are known for their strict quality standards and innovative production methods, such as the float glass process, which ensures an unparalleled smooth and strong surface. By choosing glass from these top manufacturers, we guarantee a skylight that is not only clear and beautiful but also resistant to the test of time.
2. Lamination of the bottom glass pane: safety first
One of the most important aspects of a quality roof window is the lamination of the bottom glass pane. This is crucial for safety: laminated glass with a strong lamination ensures that the glass does not shatter into sharp pieces upon breakage but is held together by the interlayer of polyvinyl butyral (PVB). This reduces the risk of injury and provides extra burglary resistance. At LUMIZEN® we standardly laminate the bottom glass pane, regardless of the size of the roof window, because we do not compromise on safety. Be aware that not all providers take this step. Some companies omit this lamination to reduce production costs or even advertise incorrectly about its presence, which comes at the expense of your safety and peace of mind.
3. Insulation value (Wm²K): watch out for honest figures
The insulation value of a roof window, expressed in Wm²K (U-value), determines how well the roof window retains heat and keeps cold out. A lower U-value means better insulation, resulting in lower energy costs and more comfort in the home. At LUMIZEN® we are proud of the excellent insulation values of our products, which are always supported by clear performance declarations, tests, and certifications. Unfortunately, this is not the standard everywhere. In the market, we sometimes see insulation values presented as better than they actually are, or essential documentation such as performance declarations is missing. This can lead to disappointments, such as a roof window that insulates less well than promised. At LUMIZEN® you can trust that what we communicate is really accurate—transparency is a core value for us.
4. Ceramic print: durable beauty without discoloration
Another feature of LUMIZEN® roof windows is our high-quality ceramic printing technology. This technique ensures that the edge at the top of the roof window does not discolor, even after years of exposure to sunlight and weather influences. This provides a lasting beautiful appearance and prevents the need for extra maintenance. Some other providers achieve a similar effect by applying silicone grease to the underside of the overhang, but this is a temporary solution that wears off, discolors, and even comes loose over time. At LUMIZEN® we choose a durable, maintenance-free solution that enhances the aesthetics of your home for the long term.
5. Finishing in the details: polished edges and breathtaking finish
Quality is often in the small details, and at LUMIZEN® we pay a lot of attention to the finishing. Think, for example, of polished and beveled edges of the glass. This not only ensures a sleek, professional appearance but also extra safety and durability. Polished edges reduce the chance of cracks and make the glass less susceptible to damage during installation or use. It is a detail you may not immediately see, but it does make a difference in the lifespan of your roof window. At LUMIZEN® we always go the extra mile so that you get a product that is right in every respect.
Why choose LUMIZEN®?
At LUMIZEN®, everything is about providing certainty. We understand that a skylight is a long-term investment, which is why we ensure every aspect of our product meets the highest standards. From using top-quality glass from Saint-Gobain, Pilkington, and AGC Japan, to the safe lamination of the bottom glass pane, honest insulation values, and durable ceramic print technology—we leave nothing to chance.
Choosing LUMIZEN® means choosing a skylight that not only delivers on its promises but also exceeds your expectations. It's the difference between a product that only looks good in a picture and a product that is truly good. Make the smart choice and invest in a skylight that offers your home comfort, safety, and beauty—now and in the future.
At LUMIZEN®, we are here to help you every step of the way. Want to know more about our products or get personalized advice? Feel free to contact us!
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