"Once the concrete is poured and cured, channels or grooves are cut directly into the form using an electric hot knife or router," according to the Insulating Concrete Form Association. "Plumbing and electrical lines are then inserted into the grooves and covered by drywall."
Tracy Hill compares the ongoing construction of her new home to that of stacking Legos. Only these Legos are concrete blocks - eight feet long and 18 inches high. [More