Driven by increasing energy costs, energy security concerns and demands for better thermal performance, building standards and codes now require higher minimum R-values for walls. Well-insulated assemblies have been a significant contributor to the boost in home energy efficiency seen in recent years—cutting home heating and cooling costs and increasing comfort. As builders seek to attract homebuyers who are more knowledgeable than ever of energy efficiency, a growing number are utilizing new technologies and construction practices to further boost efficiency—including super insulated or high R-value walls.