Many thermal insulation materials are inflammables. The external wall thermal insulation materials of buildings are the weak link to avoid fire. At that time, there was no difference in the fire rating of external wall thermal insulation materials in China. The fire of external wall thermal insulation materials shall meet in three periods: the first is the accumulation period of thermal insulation materials at the construction site, the second is the period of thermal insulation materials on the wall, and the third is the period of operation after the construction of thermal insulation system.

Many thermal insulation materials are inflammables. The external wall thermal insulation materials of buildings are the weak link to avoid fire. At that time, there was no difference in the fire rating of external wall thermal insulation materials in China. The fire of exterior wall thermal insulation materials shall meet in three periods: the first is the accumulation period of thermal insulation materials at the construction site, the second is the period of thermal insulation materials on the wall, and the third is the period when the thermal insulation system is put into operation after the construction. In the second and third periods, there is no fire protection layer on the surface of thermal insulation materials or between thermal insulation materials, which is the key period of fire.

Germany divides the question of thermal insulation and fire prevention into three levels: first, it is clear in the rules and regulations that combustible thermal insulation materials are prohibited for buildings with a height of 22 meters. The polystyrene board external wall external insulation system can only be used for buildings with a height of less than 22 meters, and most buildings with a height of more than 22 meters use rock wool external wall external insulation system. Second, in the European standard Etag 004, the external wall insulation system and insulation materials shall be graded according to en 13501-1 using fire response test data to determine the incineration function level a1-e, and the possibility of flame transmission in the insulation materials shall be indicated. In order to prevent the transmission of flame, some countries propose to select the practice of "fire barrier (fire compartment)". The fire protection demand of the external wall external insulation system should be determined according to the laws, regulations and management regulations applicable to the end use of buildings. Germany divides the fire rating into class a-b3 (GB 8624-1997 is not equivalent). The fire rating of polystyrene board materials and insulation system shall reach Class B1 according to the standard requirements, and polystyrene board materials and insulation system shall reach class B / C according to en 13501-1 standard. Third, when the thickness of polystyrene board in the external insulation system of polystyrene board exterior wall is greater than 10mm, the fire prevention structure shall be carried out under the condition of meeting the first level to reach the building fire prevention rules. The structural method is to participate in the incombustible high-strength mineral wool fireproof isolation belt at the upper opening of each window lintel and door lintel. The thickness is the same as that of polystyrene board, and the upward width is ≥ 200mm; The length direction shall extend ≥ 300mm from both sides of the window

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