As usual, the free Solar-Planit planning tool is used to calculate your bitumen project. Simply select "Bitumen" as roof type. Then you can define the formwork (wood or OSB). Of course, you still have the option of mounting on bitumen using stock screws. For this, select "Tile" as roofing type and "Bitumen shingles" as tile type.
With the calculation in Solar-Planit, you receive a static proof incl. connection to the roof.
Download: bitumen data sheet
More about the bitumen solution.