Post-occupancy investigations regarding the effects of rooftop greening: The roof of each apartment consists of a tiled gable roof in south and a flat greened roof in north covered with soil and turf of ca. 15cm thickness in total. According to actual measurements, the surface temperature of the greened roof at around 13:30 in midsummer is 7oC lower than that of the tiled roof. In terms of temperature changes between 10:00 and 13:30, the tiled roof rises by 5oC from 33-36oC to 38-41oC, while the greened roof rises by only 2oC from 30-32oC to 32-34oC. Time-lapse changes in cross-sectional temperature of the greened rooftop (Aug. 3, 1998): While the temperature on the grass-top reaches as high as 45oC, that in the soil is stable at 28oC, and the indoor thermal environment is kept comfortable, with the ceiling surface showing around 30oC. (All the above data and figures are provided by the Shukuya Laboratory, Musashi Institute of Technology)
