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Keywords: water-retaining roof brick; depths of water; ventilation; heat insulation. Abstract. As an important part of building envelope, roof has a significant impact on attic indoor's energy consumption and thermal environment. Water storage roof bricks have a good heat insulation performance and environmental effect under a certain structure. This paper researches the heat insulation performance of water storage brick with different sunshade hours and water depth to test and analyze heat preservation, and the change rules and characteristics of the temperature among the roof under water storage bricks, the roof under sunshine and outdoor. It is found that sun lighting time of water storage roof bricks has effects on the performance of heat preservation and heat insulation, and the optimum condition is when the water depth is 8 cm. And it provides the basis for optimizing the structure of the water storage roof tiles.

In this paper, the thermal insulation performance of the roof with water-retained bricks was first analyzed theoretically with respect to the thermal inertia, attenuation and delay time of the roof with water-retained bricks. Then, the experimental rig was established to carry out the experimental research on the thermal insulation performance of the roof with and without water-retained bricks on the sunny, overcast and rainy days in the summer and on the sunny day in the winter. The results showed that: (1) the surface heat storage coefficient is affected by the evaporating heat transfer of the water layer; (2) the thermal inertness, attenuation and delay time of the roof with water-retained bricks are 2.575, 21 and 6.94 h, respectively, when the water depth is 2 cm; (3) on the sunny, overcast and rainy days in the summer, laying water-retained bricks can enhance the heat insulation performance of the roof, and can improve the thermal comfort of the loft; and (4) on the sunny day in the winter, after laying water-retained bricks, the average temperature of the loft in 24 h increases by 2.3 °C, and the temperature fluctuation of the loft decreases by 56.0%. Therefore, the thermal insulation effect is significantly improved after laying water-retained bricks on the roof from the results of both the theoretical and experimental study.