The concrete bonds to the foam, creating a triple-insulation. Depending on the architectural design, the interior foam can also be covered with dry walls. The exterior foam can also be covered with brick, cultured stones, or stucco. ICF is the most efficient building method and also the easiest to erect. ICF construction is extremely strong and can easily surpass building codes for tornado and hurricane prone areas.
Energy efficient building construction involves more than framing. Doors and windows must be considered. The Fire & Restoration Services windows in a typical house can lose more than 25% heat. Modern windows are less efficient than walls and should be avoided in energy-efficient houses. In cold climates, the windows should not be more than 9% of the total floor area. The northern, eastern and western windows in warm climates should have low solar heat loss coefficients. House designs should also include properly designed roof overhangs to allow for south-facing windows.