Use the menu at right to browse our listings. Sentinel High School underwent a Gymnasium and Science Classroom wing expansion. BCE provided full service Structural Engineering design and construction support for the 30,000 sq. ft. addition. The Gymnasium is East Elevation constructed with 5" prestressed concrete walls that support long-span open web steel joists with steel decking. The classroom wing is constructed with steel framing with elevated concrete slabs over steel decking. The complexity of the floor plan presented many challenges in detailing and frame design. The projected cost of the expansion was $4.4 Million. Additional Photos: