Thermal insulation characteristics of green roofs in natural state

Measures internal surface temperatures of roofs with and without greening and climate parameters under natural climate in Chongqing summer. Analysing the field test data, obtains following results. The effect of roof greening on reducing the highest temperature on the internal surface is remarkable, the effect on reducing the mean temperature is slightly less notable, but the sum of mean temperature on the internal surface exceeding air mean temperature for green roofs is about 1/4 of that for roofs without greening during hotter days. The air temperature increase for green roofs is greatly reverse to solar irradiance during a day, the reversion is weakened during a period of days alternatively fine and rainy, and the reversion is transformed into a strong positive tropism during all hotter days of a summer. For roofs without greening, the air temperature increase is all strongly positive to solar irradiance during a random period of days.