As energy costs continue to rise, almost all state and federal authorities have adopted energy conservation building codes and standards that apply to the design and construction of buildings to reduce the use of nonrenewable energy sources. One of the most basic elements of an energy efficient building is a well-insulated and sealed building envelope that serves as a thermal, moisture, and air barrier between outside and inside environments making a significant contribution to the overall energy efficiency of a building.

In a study by the Portland Cement Association, the combination of high-performance R-values, low air infiltration, and high thermal mass accounted for an energy savings in ICF buildings of up to 50% compared to wood, steel, or masonry structures. Factors contributing to the energy efficiency of a CELBLOX® ICF wall include:

- Zero thermal bridging (the point where insulation is not continuous) – a characteristic of wood, steel, and masonry walls.

- A continuous EPS envelope that eliminates air infiltration through the wall.

- High thermal mass of concrete which absorbs heat (or cold) and minimizes interior temperature fluctuations.

- An effective performance R-value of R-28 to 40 or more when compared to other types of insulation.