Telhado verde e seu desempenho térmico em residências de regiões semiáridas.

The green roof is used as an alternative for residential thermal cooling, as it aids in heat transfer and provides environmental and economic benefits. Thus, it aimed to evaluate whether the presence of the green roof alters the thermal residential conditions in a semiarid region. The green roof was conducted in a residential area, where two sensors (thermohygrometer) were installed indoors and outdoors. An area of 8.4 m2 was determined for the green roof, where four layers (wood plywood, carpet, cardboard, and substrate) were installed, and then the transplanting of Selaginella convoluta (Selaginellaceae) was carried out. The treatments were carried out in two different situations, analyzing the internal and external environment, with and without the use of a green roof (EXTER&lowbar;S, EXTER&lowbar;C, INTER&lowbar;S and INTER&lowbar;C). Temperature and relative humidity data were collected at 9:15 am and 9 pm for eight days and submitted to Tukey's test (p<0.05). The average temperature at 9 am was 23.32 ºC and at 3 pm, 32.8 ºC and 31.75 ºC on average for EXTER&lowbar;S and INTER&lowbar;S, respectively. There was a reduction in internal and external temperature, 1.53 °C and 1.7 °C, respectively, at 9 am, followed by 2.4 °C and 4.58 °C, at 3 pm and 3.65 °C and 4.37 °C at 9 pm in the studied environments. The RH% increased in the evaluated times, having a considerable increase at 9 pm (22.32%) in the EXTER&lowbar;C environment. The green roof helps to reduce temperature and increase residential RH, making it a sustainable alternative for thermal cooling in semi-arid regions. [ABSTRACT FROM AUTHOR]