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- The shell of the home or building is constructed utilizing a single-sided Insulated Concrete Form referred to as SSICFs. It is referred to as single-sided because one side has a structural plywood material that can be removed enabling the concrete thermal mass to have good communication with the interior of the structure. Research is also underway to determine the feasibility of TWT construction utilizing a concrete masonry unit (CMU) (concrete block) or Architectural CMUs. Initial indicators suggest CMUs could be utilized in many TWT applications.