The KAP-Steel-Wave is celebrating 10 years of ETA approval and is now considered an integral part of many modern double wall systems – and its popularity is growing. The vision was to develop structural elements for double walls that are not only stable, but also easy to handle and lightweight. It was also important that they were suitable for insulated double walls. This led to the development of the patented KAP-ISO-Wave made of glass fibre, which has won numerous awards.