The rooftop garden, which has a soil thickness of 40 cm, is supported by a portal structure of 105 mm square columns and beams arranged in a louvered pattern at a pitch of 227.5 mm. The vertical lattice also serves as a blindfold. The ceiling of the first floor is made of two pieces of 105 x 390 mm laminated wood to form a wooden slab to support the floor load of the second floor with a span of 3.6 m. The ceiling of the second floor is also made of 105 x 240 mm laminated wood to support the roof load.

Japan | Tokyo

Jutakutokushu October 2011 issue 36P