A-Rated Solutions Construction Method A-Rated construction using Insulated Concrete formwork. Built Faster Built Stronger Pre Insulated Energy Efficient Insulated Concrete Formwork (ICF) is a new approach to residential building having high energy efficiency ratings and shorter construction periods compared to traditional methods. ICF consist of interior and exterior insulation with a reinforced concrete core. this eradicates the cold bridge from the outdoor elements while providing a strong structural core. New Builds & Extensions