what is icf formwork
The cavity is filled with concrete to create the permanent wall. Insulating concrete form or insulated concrete form (ICF) is a system of formwork for reinforced concrete usually made with a rigid thermal insulation that stays in place as a permanent interior and exterior substrate for walls, floors, and roofs.he first patent for an insulated stay-in-place formwork for concrete was registered in the early 1940s using recycled waste wood and cement as the insulating material. This patent was registered by August Schnell and Alex Bosshard in Switzerland.