PSS20-40 Drain Board  develops on the foundation of HW-PSS18 is made by the high polystyrene (HPIS), is a one-sided drainage plant, the surface is suitable for the under board of underground garage, the under board of basement, water tight diaphragm. 
the construction details sees (the under board of underground garage)

Product: HW-PSS40

Color of under plate: Black/White

Material quality: High Polystyrene

Quality(g/): 1270

Thickness (mm):40

Compressive strength (kpa): 150

Color of Geotextile Membrane: Black/White

Material quality: Polyester fiber

Hole caliber (mm): 0.15

Runoff rate: 320

Tensile strengthN: 160

Quality(g/): 150

Specification of Drain Boardmm: 1200×16660

1) the drainage is made of HIPS;
2)inlude single and doble side;
3)hinght from 20mm to 60mm.