Here we conducted a limited field survey of the existing roof structure. We analyzed existing load capacities at locations of recent roof openings. Compared estimated actual loads and design loads with the placement  and replacement of several 30-ton roof top units and the relocation to determine if reinforcements are necessary. Attachments for humidifiers were near the new roof top units were designed. Also we designed to reinforce openings at beams as necessary to account for the revised loading of the roof top units. Lastly concrete strengthening due to roof openings and additional loading was installed