9.2 Types and Materials Used for Sheetpiling Timber sheetpiling:used for free-standing walls of H<3m,for temporarily braced sheeting to prevent trench cave-ins,is little used except in temporary retaining structure Reinforced concrete sheetpiling:are precast concrete members,usually with a tongue-and- groove joint.If the joints are cleaned and grouted after they have been driven,a reasonably watertight wall may be obtained. 9.2 Types and Materials Used for Sheetpiling ❖ Timber sheetpiling: used for free-standing walls of H<3m, for temporarily braced sheeting to prevent trench cave-ins, is little used except in temporary retaining structure ❖ Reinforced concrete sheetpiling: are precast concrete members, usually with a tongue-and￾groove joint. If the joints are cleaned and grouted after they have been driven, a reasonably watertight wall may be obtained