EXPOL StyroDrain(protection & drainage) is a permeable lightweight drainage material manufactured from 100% recycled Expanded Polystyrene material, offering drainage, and protection to the water-proofing membrane used on retaining walls.
Here is an example of QuickDrain been used in conjunction with StyroDrain in a Retaining Wall Project.
A double layer of EXPOL StyroDrain may be required if the retaining wall is higher than 1.2 metres or in special circumstances. StyroDrain comes in easy-to-handle sheets 90mm thick and can be cut with a sharp knife or hand saw. Sheet Size 2400 x 1200 x 90.