The construction industry is a major contributor to the U.S. economy. Its contribution to the U.S. gross domestic product (GDP) can be as high as 10 % or as low as 5 % [1]. Construction worldwide contributes up to 6.5 % to the world gross product [2]. The U.S. construction market is 15 %–25 % of the entire world's construction market. Every percent improvement in productivity in the U.S. construction industry equates to more than $10 billion dollars and will have a major effect on the national economy and resource usage footprint.