Project Images Glenwood Elementary School additions Project Summary Hanson served as the structural, mechanical, electrical and plumbing consultant for three building additions at Glenwood Elementary School in Chatham, Illinois. The additions totaled 19,804 square feet, with 14 classrooms and a capacity of 350 students. Structural work consisted of 4-inch floor slab on grade with 6-inch drainage fill/gas condensing boiler; continuous concrete trench wall foundation footings; concrete masonry unit load-bearing walls; and a steel deck roof system supported on level open web steel joists. Mechanical work included a heating-and-cooling system consisting of a geothermal-exchange loop with variable refrigerant flow (VRF) distribution. Geothermal/VRF, water-cooled condensing units were installed in the mechanical room of each building addition and were connected via the VRF piping system to the ceiling-mounted air-distribution "cassettes" installed in each classroom. Roof-mounted makeup air units also were installed to provide fresh air for each building addition. Plumbing work included extending plumbing systems from the existing building into each addition to serve classroom sinks and restrooms. Similarly, the fire sprinkler system from the existing building was extended into each addition. Electrical work consisted of a new fire alarm system; intrusion detection, access control and video surveillance systems; a central sound system; a clock system; technology including rough-ins for technology writing, student computer work stations and teacher work stations; sound reinforcement; general, interior lighting; emergency egress lighting; general-purpose receptables; and new sub-distribution panels. Hanson also specified new, electrically operated, retractable bleachers in the gymnasium and improved the driving lanes of the student drop-off area.