Ecological composite draining and breathing roofing

The present invention provides an ecological composite drainage breathing roofing structure, which is characterized by that on the roof board the sectional sloping layer, water-filtering layer and protective layer, the upper portion of drainage channel between sectional sloping layers is covered with arched covering plate, and is equipped with moisture-discharging pipes communicated with it, and said drainage channel is communicated with drainage system of building, and on the roof boarding and on the local stress concentration place several stress releasing holes are opened. Said invention is simple, and easy to implement, does not damage roof, and can prevent leakage and possesses good ventitation and air permeability, and heat-insulating effect, and is suitable for planting green plants, and its cost is low.