Northrop Grumman Warehouse, Apopka, Florida. The project is an approximately 11,300 SF warehouse building expansion. The structure of the warehouse is steel joist and girders/beams supported by interior steel columns and perimeter precast concrete wall panels. The wall panels and their connections are designed for both direct and lateral wind pressures. The new roof framing coordinates with the existing PEMB roof construction which is approximately 31 feet tall. The foundation is concrete spread footings. The project also includes a 1,300 SF two-story mezzanine adjacent to the existing building and inside the new addition.