PROBLEM TO BE SOLVED: To provide a rooftop greening system lightweight and excellent in leaping flame resistant properties.SOLUTION: This rooftop greening system 1 includes a transverse bulkhead member 40 arranged along a direction crossing an inclination direction at right angles between greening units 10 adjacent to each other in the inclination direction of a roof 3. The greening unit 10 has a greening member 20 attached to a flat plate-like panel member. The transverse bulkhead member 40 has a transverse frame part 45 formed by overhanging in the inclination direction of the roof 3, and at least a drainage layer is made of a nonwoven fabric.
