The system of drainage insert borad installed to create a void space before concrete slab was pour on tpp of it.It can stand a long time pressure,and won't be out of shape.

The drainage board manufactured from post-consumer recycled polyproylene products.it is lightweight and features great compressice strength,which designed as a sub-surface drainage and waterproofing protection solution,with the ability to discharge water at a rate of 16.5 litres per square meter per second.

When drainage borad is installed beneath pavers, ballast or under roof decks, it also reduces the transmission of radiant heat and sound to the substrate. Today, VersiCell is commonly used in major building and civil construction projects that require long-term drainage solutions.

The drainage board can be placed hard up against the retaining wall after the water proofing membrane or tanking has been applied, adhesive to secure the sheets to the wall before back filling.