Build drainage board is mainly made of polystyrene or polyethylene plastic plate after punching cone penetration units made from. Top surface plastic cone penetration units access layer of filter geotextile to prevent soil particles through, thus avoiding blocking drainage channels so smooth drainage. The traditional use of brick tile drainage as a guide filter layer, the use of more pebbles or gravel as a filtration bed, the water discharged to the designated place. Now replace the pebbles treatment layer with a drain to drain the save time, effort and energy saving investment, but also reduce the load of the building. Build drainage board construction can first garage roof construction at the corners with a retaining wall began laying down slope edges overlap each the size of a fulcrum fulcrum; or no overlap, coated with water directly bonded to each other. The drain board to form a whole, both the drainage, but also play the role of the root partition, while still a secondary waterproofing layer, the shape can be cut according to the situation. 

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