Decking .designed for the future. • Wood Plastic Composite (WPC) .. Ash. Below are colour options for decking type 150 decking. Sandstone . Type 140 PVC. Width: 150mm. Depth: 22mm. Length: up to 3660mm. Fixing: . All data based on Live Point Load testing using 300m x 75mm Pad to replicate 'a foot' in room.