What are the thermal insulation characteristics of Southeast Asian style roofs and what are their uses?

In the hotel design of Southeast Asian style, the most direct way for designers to block solar radiation is to set up a sunshade frame. Yang Jingwen designed it for himself), and the roof is covered with shading grids, covering the whole house. In the design, according to the trajectory of the sun from east to west in each season, the grid is made into different angles to control the amount of sunlight entering in different seasons and times. With such a sunshade grid on the roof, the roof space becomes a good activity space. At the same time, because the exposure of the roof is reduced, it is beneficial to energy saving. This design is very modern, and it is an innovative response to geographical location and lifestyle.

2. Set heat insulation interlayer.

Setting an overhead ventilation interlayer on the flat roof can directly block the sun radiation, and at the same time, it can continuously take away the hot air in the interlayer through wind pressure and hot pressing, so that the heat transmitted into the room through the roof panel is greatly reduced, thus achieving the purpose of heat insulation and cooling. Ventilation interlayer is generally set on the roof for overhead ventilation and heat insulation, and sometimes the space in the ceiling shed is used as ventilation interlayer. In the design of Southeast Asian style hotels, the roof with insulation room is suitable for well-ventilated buildings.

The overhead ventilation layer usually adopts brick pier overhead concrete slab (or large brick) ventilation layer. The design points of overhead ventilation layer are as follows:

(1) The height of overhead insulation layer should be determined according to the change of roof width or slope, and the clearance height is generally 180 ~ 300mm. When the roof width is greater than 10m, a ventilation bridge should be set at the roof ridge to improve the ventilation effect.

(2) In order to make the air in the raised floor form convection, the raised floor is generally not laid within the range of 250mm wide from the parapet, so that the periphery of the raised floor is open. When the facade modeling allows, the parapet can directly open the air inlet and air inlet. The air inlet should be located in the positive pressure area of the maximum frequency wind direction in the local hot season, and the air outlet should be located in the negative pressure area.

Planting roof

In recent years, planted roofs have developed rapidly. The structure of planting roof can be determined according to different planting media, and it can also be lawn, garden, gardening and mixture. The waterproof layer is located at the bottom of the whole system and is protected by multiple layers of the superstructure. The waterproof effect is safer and more effective than the traditional single process. The planted roof is not directly exposed to sunlight, but in summer, the roof temperature can be effectively prevented from rising through the heat absorption of plants, water evaporation and the shielding effect of the system itself. In winter, the indoor heat will not be easily lost through the roof, which plays the role of warm in winter and cool in summer, and can completely exceed the thermal insulation effect of the existing conventional methods. Non-cold areas generally do not need to set up additional insulation measures. In addition, planting roofs can effectively reduce photoacoustic pollution and secondary dust, absorb garbage, discharge oxygen, intercept rainwater, and reduce urban heat island effect.