Orthoplast® is a waterproofing complex made up of a highly modified bitumen membrane and an asphaltic concrete formulated with the same binder, which is laid at high speed on the metal decks of engineering structures. Orthoplast® adheres perfectly to metal and withstands substantial deformation without rutting or fatigue, thus ensuring waterproofing quality and engineering structure durability. Orthoplast® is the only deck waterproofing process to have received a Technical Opinion.