An aluminium/PVC-U combination is a practical option if you want to bring together a high-quality look, good thermal insulation and cost-effective efficiency. On the outside, aluminium provides a robust, weather-resistant surface and a particularly high-quality appearance. At the same time, PVC-U offers good insulation properties, making it a cost-effective solution. A combination of materials can also be beneficial inside a house, particularly when different areas are to be designed differently. This holds true, for example, when large glass surfaces require particularly slim and sturdy frames, while energy efficiency and budget considerations take precedence in other areas.