Akira Ito, Kazhuhiro Inomata, Takayuki Mizuno (Kume Sekkei Co.,Ltd.)

The city hall, which integrated CLT slabs in office environment, was adopted seismic isolation system by using basement columns, steel structure for the main building, and CLT floors for the administrative areas. CLT floor slabs with double layered local timbers from Yatsushiro City, has succeeded to realize the interior safeness to avoid an accident of collapse ceilings. It also offers the warmness of the timbers as they can feel the locality through the material. By taking advantage of local climate, it realized to balance low energy consumption and comfortability, by adopting lower heat load exterior and narural ventilation system.