Warmbeton is a thermal insulating ultra-light concrete, which can be used for structural applications. The primary ingredient is expanded glass, which replaces all the sand and gravel. Two thirds of the concrete volume consists of air, entrapped within the aggregates as well as the hardened cement paste.

The material has a thermal conductivity of 0.13 W/(m•K), dry density of about 750 kg/m3 and compressive strength above 10 MPa. A 45 cm thick wall made with Warmbeton achieves a thermal resistance of 3.5 m2• K/W. Therefore, it is especially suitable for the use in façades and complete building walls, allowing fast construction without the need for any other insulating materials or load-bearing sections.

Warmbeton is suitable for various architectural constructions, offering the possibility of monolithic façades (amongst other things) and, at the same time, eliminating the risk of creating thermal bridges. With this concrete it is also possible to create frameless windows. The material can be cast on site or be used for prefab elements.

While the material is more expensive per m3 compared to conventional concrete, the total costs of construction with Warmbeton are competitive with traditional concepts.