Whats an insulating concrete form (ICF)?
ICFs are polystyrene forms that stack like blocks with steel rebar inside. Once these blocks are assembled, concrete is poured into the hollow core of the block to create walls. They are either shaped into pre-formed interlocking blocks or separate panels connected with plastic ties. These left-in-place forms not only provide continuous insulation on both sides of the wall, but also provide a backing for drywall on the inside and stucco, lap siding or brick on the outside.
