Helidex Offshore LLC | 758 followers on LinkedIn. Supplying Quality Offshore/Marine and Rooftop Aluminum Helidecks/Heliports since 1998. | We are the leading US based supplier of aluminum helidecks for the offshore industry. We have offices in New Jersey and two manufacturing plants in South Carolina. We specialize in the design. manufacturing and installation of aluminum helidecks, aluminum support structures and helideck lighting and AFFF fire suppression systems.