Abstract: A roof structure (10) for photovoltaic generation of electric current and/or for heating a flowing medium, in particular an airflow (14, 20), comprises glass roof panels (24) that are flat, transparent or equipped at least partially with solar cells (60) of flat design. Said panels are laid at a spacing (a) from a subroof (12) with formation of an airtight flat gap (18) that is largely free of obstructions in the flow direction, and are preferably of square or rectangular design.