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Sloping layer is an important level of Flat Roof. It usually have both slope and heat insulation double function. Its thickness is obtained through energy conservation. But because its thickness is variable, in engineering practice it is difficult to accurately determine the thickness. The sloping layer thickness depends on the requirements of the roof energy saving. It is important to thoroughly analyze the principle of roof heat transfer and to establish the mathematical model of roof heat transfer. Then through rigorous mathematical calculation, the common law of how to determine the sloping layer thickness can be summed up. According to the slope gradient, slope length and layer thickness calculation value, the maximum thickness and the minimum thickness can be ultimately determined.