ICF wall construction using insulated concrete forms in Belize Most buildings in Belize are still constructed the same way they were decades ago. Concrete block, heavy labor, long timelines, and structures that fight the climate instead of working with it. ICF changes that. Insulated Concrete Forms , commonly referred to as ICF, are a modern construction system that combines strength, insulation, and efficiency into a single wall system. Instead of stacking hollow concrete bl