Single-side forms — A single-side form system is much faster to build and needs less materials. In this innovative system, walls are formed with plywood, then sprayed with shotcrete to create an ultra-strong structure.

Single-side forms — A single-side form system is much faster to build and needs less materials. In this innovative system, walls are formed with plywood, then sprayed with shotcrete to create an ultra-strong structure. (Michael South)