Our dimpled drainage sheet is ideal for separating the soil layer and foundation walls, providing a perfect protection for foundation walls of building. It can also serve for drainage and rear ventilation of the masonry which will effectively prevent mould growth. Moreover, this drainage device also can be used in the construction of the \"green roof\" as an intermediate layer as well as a screed pad to protect against rising damp. Additionally, made of HDPE, the foil film is highly resistant to pressure, moisture, rot, chemicals, tear and wear.