An overview of the Drainage Board Drainage Board sub-coil and sheet two series in which the membrane is divided into two types of "hot melt" and "lap", using a special process to shape the plastic sheet pressure closed convex cylindrical housing, form a bump-like membrane, shell continuous three-dimensional space and some support height, the top of the shell covering the geotextile filter layer for water seepage, hydrophobic, drainage and water storage products. Also known as: sparse row of panels, drainage protection board, drainage board, the plastic bump drainage board, plastic sandwich board. Applications Green Engineering: garage green roof, roof garden, vertical greening, the oblique green roof, soccer fields, golf courses. Municipal Engineering: airports, road embankment, subways, tunnels, garbage landfill. Construction: building the basis of the upper or lower, basement and outside walls, roof impermeable insulation layer. Traffic Engineering: roads, railway embankment, dams and slope protection layer. Water conservancy project: reservoir seepage water, reservoir, artificial lake water seepage. Commonly used in the construction of drainage board: plastic drainage board, drainage board storage coil drainage board, water seepage and drainage board, composite drainage board, three-dimensional drainage board, sheet drainage board.