Building insulation has become an increasingly important topic in recent years. Good exterior insulation reduces heating costs, which means lower CO2 emissions. Nowadays, sustainable natural insulation materials are already available for the interiors of buildings. But what does sustainability really mean? It means the material should be environmentally friendly and made from renewable raw materials, it must have good thermal insulation and fire protection, and it must be easy to recycle at the end of its useful life. A research group at the University of Göttingen has long been researching manufacturing processes for products made of popcorn that are sustainable and efficient. The University has now agreed a license agreement with the Bachl Group for the commercial use of the process and the products for building insulation.