A ridge structure at a roof edge, having a base panel lying on a roof surface and a hollow ridge structure over the base panel. The hollow ridge structure is constructed in a flat spring form along the eaves, and therefore one slope of the ridge faces the roof and the other slope the opposite direction. The slope facing the roof can be lifted to receive and secure roofing materials between the slope and the base panel. When water flows down the roof surface, most water flows over the ridge structure and the rest flows into the hollow space inside the ridge structure and drains through drain holes on the base panel.