What is ICF? Insulated concrete form (ICF) is a system of expanded polystyrene (EPS) rigid insulation blocks separated by plastic webbing. It is used as an integrated concrete form to pour a concrete wall instead of a traditional wood plank or plywood form.

An ICF (insulated concrete form) is two sheets of expanded polystyrene foam board (EPS) held a distance apart by rigid plastic ties. These interlocking forms stack and connect to create a hollow wall, given that they are filled with reinforcing bars and then concrete.

Two sheets of expanded polystyrene foam board (EPS) are held apart by strong plastic ties in an ICF (insulated concrete form). This is simply what ICF construction is all about. When these interlocking forms are filled with reinforcing bars and concrete, they stack and connect to form a hollow wall.