Photo: Courtesy Of Controlled Demolition Inc. Photo: Courtesy Of Controlled Demolition Inc. A 1,410-ft-tall signal tower in Liberia, formerly used by the U.S. Coast Guard for ship navigation and the tallest structure in Africa, was imploded on May 10. Mark Loizeaux, president of Controlled Demolition Inc., the project's Phoenix, Md.-based subcontractor, says it is the world's tallest man-made structure to be felled by explosives. The tower weighed 520 tons. The government of Liberia approached the Coast Guard for help felling the tower, which was decommissioned in 1997 says Lt. Col. Clement Ketchum, a U.S Army official in Monrovia. The Liberian
The market is generally healthy and steadily growing, and margins are up for large specialty contractors. Further, advances in design tools and owner demand for collaboration are giving subcontractors a seat at the table early on in projects.