Drainage boards generally refer to two types: coil drainage boards and sheet drainage boards. Sheet drainage board is the same as water storage and drainage board. The roof is generally made of sheet drainage board. Basement drainage boards are generally made of rolls.

Although both water storage and drainage boards and drainage boards are drainage products, their functions are different. Drainage boards can block roots and drain water, but they cannot store water. Water storage and drainage boards can drain water and also have the function of storing water, but they cannot block roots. Both water storage and drainage boards and drainage boards are classified as drainage materials. Drainage boards are mostly used for roof greening and indoor planting.

Construction characteristics of drainage boards:

It is convenient for construction, easy to maintain and economical.

2. Strong load-bearing capacity and durability

3. It can ensure that the excess water is drained away quickly. ?

4. The water storage part can store some water.

5. It can provide sufficient water and oxygen for plant growth.

6. It is lightweight and has strong roof insulation and heat preservation functions.

Common specifications of composite geomembrane:

One fabric and one film (fabric: 100-1000g/m ², film thickness: 0.1-1.5mm)

Two fabrics and one film (fabric: 80-600g/m ², film thickness: 0.2-1.5mm)

One fabric and two films (fabric: 100-1000g/m ², film thickness: 0.1-0.8mm)

More fabric and more film

Geotextile, as the protective layer of geomembrane, protects the anti-seepage layer from damage. To reduce ultraviolet radiation and enhance anti-aging performance, the embedding method is adopted for laying. During construction, first use sand or clay with smaller particle size to level the base surface, and then lay it. When laying, do not stretch it too tightly. The parts buried in the soil at both ends should be in a wavy shape. Then, on the two pieces of fabric and one film laid, spread a transition layer of about 10cm with fine sand or clay. Lay 20 to 30cm of block stones (or precast concrete blocks) as a protective layer against erosion. During construction, it is necessary to avoid direct impact of stones on it as much as possible. The protective layer should be constructed while laying the film. The connection between the two fabrics and one film and the surrounding structures should be anchored with expansion bolts and steel plate pressure strips. The connection parts should be coated with emulsified asphalt (2mm thick) for bonding to prevent leakage at this location. The treatment of construction joints is a crucial process that directly affects the anti-seepage effect. The common joint methods include: ① Lap joint: The lap width should be greater than 15cm; ② Hot welding: It is suitable for slightly thicker geomembrane base materials, and the lap width of the weld seam should not be less than 5CM.(Adhesive bonding is not recommended. Long-term water immersion is prone to delamination, and the anti-seepage effect is poor.)

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