This substructure can be used for attachment on sloped roofs with different roof coverings (module independent). This comprises a of a roof attachment element (e.g. roof hook, roof seam clamps, hangar bolt, trapezoidal shoes, etc.), aluminium profle rails, stainless steel joint elements and a material for clamping the modules on the profile rails. Selection of the appropriate roof attachment element is based on the roofing, the condition of the load-bearing roof sub-structure, the load-bearing capacity of the roof and the roof angle.