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Hollow core is a type of slab that is made of concrete and contains prestressed reinforcement. The elements have longitudinal air channels to optimize material use and load-bearing capacity. The hollow cores are manufactured in different thicknesses depending on the desired function. This type of slabs allows for large spans, which also provides good conditions for a flexible use of the building over its lifetime. It is also a very resource-efficient product that utilizes the included material optimally. The low wc ratio and the high strength mean that the construction dries out quickly. With hollow core slabs, the building also receives very good properties in terms of sound insulation and good resistance against fire and moisture. Another of the concrete important properties is its ability to store heat, which enables a low energy consumption and a lower power output during the buildings entire operating time. Hollow cores are 100% recyclable and enable fast, cost-effective and rational assembly in the construction project. This type of slab is also well suited for reuse.