Abstract
In this study, we conducted the experiment to evaluate the heat shielding property and heat retention property when boards made of water content concrete were laid on the building roof from the summer of 2016 to the winter. By the measurement results in the summer, it was shown that the laying method with the hollow layer in two layers was the most effective for reducing the heat flux and the roof surface temperature. Even at the time when 6 days passed after watering, the integrated value of the conductive heat into building was 13.7% of the untreated plot. By the measurement results in winter, no significant difference was observed in the daily cumulative value of conduction heat flux due to the difference in laying method, but the lowest value of the roof surface temperature was the highest in the two-layer hollow. In the summer and winter seasons, as a method of laying on the roof of the building, it was shown that the two-layer hollow type is the most effective laying configuration, but when using only one layer, the construction method to lay was highly effective with a hollow between it and the roof surface.
