Speculation shrouds the future: traditional sources of energy are recognized to have environmental drawbacks, while alternative sources have a long way to go before they can be considered viable replacements. In this uncertain time, energy efficiency of the building envelope ought to be a top priority in new construction to reduce heating and cooling demands.
For stud frame walls, there are two keys to energy efficiency: insulation and moisture control. The need for insulation is obvious; slowing the transfer of heat lessens the need for a building’s HVAC systems to run. However, moisture control is just as important. If water is allowed to accumulate or condense, the structure will begin to degrade, and no amount of insulation will save a rotting wall.