SteelCrete by Simple Building Systems Inc. SteelCrete, invented by Tony Ruiz, is a patented composite building system. It uses metal studs embedded into thin concrete (1.5" to 2") to form panels for construction that are stronger-but-lighter than solid concrete, concrete block or any other conventional construction method. The bonding of the concrete and metal becomes so strong that this building system is a case of the whole being greater than the sum of its parts. SteelCrete gives you a competitive edge over tilt-up and other building systems by allowing you to build faster, stronger buildings at lower cost.