The HW-106 sheet drain develops on the basic off the HW-103, is made by the high polystyrene (HIPS). The surface is joined to an adhesive-bonded cloth, thus forms a combination sheet drain. HW-106 is the one-sided raised Taiwan sheet drain , only then the draining water function, compares with HW-103, the HW-106 displacement is bigger. Is suitable quite is deep in the soil layer does not need to store water the function large-scale square to afforest, project and so on garage roof afforestation. The construction for details sees (chart garage roof project)