For over 30 years Florida Rock and Sand Prestress Precast Co. has built its reputation  in the South Florida, Miami area construction industry by providing  on-time delivery of Concrete products such as FDOT grade piling. Built to your exact specifications, our FDOT Piling (14” 18”, 24”) is used in bridge foundations, building foundations, marinas and docks, port construction, water and waste water treatment plants. tank foundations and seawalls.