Final answer:
ICF construction can incur higher upfront costs compared to traditional construction methods, which is not an advantage. This increased cost, however, is offset over time by potential energy savings.
Step-by-step explanation:
ICFs are forms for poured concrete walls that stay in place as a permanent part of the wall assembly. The forms, made of foam insulation, are either pre-formed interlocking blocks or separate panels connected with plastic or metal ties. The expected benefits of ICFs include increased thermal insulation, soundproofing, strength, and speed of construction. However, while lightweight concrete may have advantages such as load reduction, faster building rates, and excellent thermal protection, these do not directly address potential disadvantages of using ICFs.
One disadvantage of using ICFs that does not apply to lightweight concrete is the cost. ICF construction can be more expensive upfront when compared to traditional wood-frame construction due to the cost of the foam blocks and additional labor for assembly. This increased cost is not an advantage in the use of ICFs for concrete walls although over time, energy savings can offset this initial investment.