SigmaRoc, the buy-and-build construction materials group, has entered into a licensing agreement with Tarmac Trading, for the manufacture, distribution and installation of its Shuttabloc system. Shuttabloc, developed by SigmaRoc subsidiary Poundfield Products, is a revolutionary pre-cast retaining wall with internal reinforcing system, and it forms part of Poundfield's offering of innovative offsite solutions. Protected by a series of patents, the Shuttabloc system has applications in the industrial