The invention discloses a
green roof structure with the rainwater retaining ability. The
green roof structure comprises a
plant layer, a soil layer, a filtering layer, a
water storage and drainage layer, a
moisture preservation layer and a waterproof layer from top to bottom; the
plant layer is composed of perennial herbs, namely
sedum lineare, the planting row spacing is 4-6 cm, and the line spacing is 8-10 cm; the soil layer is composed of mixtures of light sandy soil,
humus and
vermiculite, and the thickness of the soil layer is 15-20 cm; the filtering layer is composed of
polyester fiber non-woven fabrics and extends towards the side wall surface of a building to the part below surface soil by 5 cm, and the effective width of lap seams is 10-20 cm in the laying process; the
water storage and drainage layer is composed of
polyethylene concave-convex drainage boards with the thickness
ranging from 30 mm to 60 mm; the
moisture preservation layer is composed of
moisture preservation blankets with the thickness
ranging from 20 cm to 30 cm, and the moisture preservation blankets are arranged adjacently and closely; the waterproof layer is composed of
polymer modified
asphalt root-resisting
waterproofing membranes. The
green roof structure has the advantages that the
land resources are saved, the green area is increased, the environment is beautified, the heat island effect is reduced, the
storm runoff is lowered, and the
air pollution is reduced.