What Marquette University, Milwaukee, wanted for its new Al McGuire Center sounded simple enough—a 22,000-square-foot maple gym floor that would be flat and would not buckle and warp over time due to moisture problems. For Milwaukee's Opus North (specialists in design/build construction), the floor was a critical-path item on the construction schedule. Opus North wanted fast construction but without problems between the concrete and flooring contractors. In order to honor the schedule for the wood flooring installation, the moisture content in the concrete floor slab had to be low enough. Making all this happen would be a challenge involving good technology and attention to the details.