The movie shows the use of cellular glass gravel and the printing of the house, layer by layer. In fact, the house was printed by only two people and a huge cement mortar printer. The challenge was to develop a mortar, which allows printing but which does not flow after printing.
On the flat roof, GLAPOR cellular glass boards were installed with bitumen. Although, the main target was to use only mineral materials, bitumen, as an exception on the rule, was used to have a firm adherence to resist important wind loads.
More information about the printing can be found in another YouTube movie.