When the city of Frankfurt needed a temporary facility for a newly established middle school, the IGS Kalbach-Riedberg, they turned to NKBAK architects. The local firm had completed another provisional facility in 2015 for the pre-K-through-first-grade European School Frankfurt or ESF using prefabricated wood modules to meet a tight planning and construction schedule. The architects welcomed the chance to adapt this kind of construction to a different type of school, says firm coprincipal Andreas Krawczyk, “to test the possibilities of the modular wood system.” The brief here called for a cafeteria, offices, and 11 classrooms to accommodate 200 students, in grades five and six.