ICF’s (Insulating Concrete Form) are pre-shaped forms that are used to build the exterior wall of a building in which concrete is poured down the hollow center to form the exterior wall. The form (usually made of some type of insulating foam (styrofoam for example) will stay in place as a permanent part of the wall assembly.
The forms are either pre-formed interlocking blocks or separate panels connected with plastic ties ( I highly recommend the interlocking blocks, don’t go for the ones with plastic ties!!). The forms filled with concrete not only provide a continuous insulation (that keeps your electric bills super low) and sound barrier (which keeps the neighbors happy), but they also will usually contain some type of embedded attachment to act as a backing for drywall on the inside, and stucco, lap siding, or brick on the outside.
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