With the continuous improvement of the requirements for energy conservation and environmental protection, the thermal insulation technology of building maintenance structures is also increasingly strengthened, especially the external wall thermal insulation technology has been greatly developed, and has become an important building energy saving technology in my country. At present, the external wall insulation commonly used in buildings mainly includes metal embossed boards, external thermal insulation, and mixed internal and external thermal insulation. However, in the construction process of different thermal insulation methods, various quality problems also occur. By analyzing the problems caused by the metal embossed plate, it plays a preventive role in the quality problems in the project.

1. Metal embossed board

Metal embossed board is a construction method that uses benzene board, thermal insulation mortar and other thermal insulation materials on the inner side of the outer wall, so that the building can achieve thermal insulation and energy saving. The construction method has the advantages of convenient construction, low requirement for the verticality of the outer wall of the building, and fast construction progress. In recent years, it has also been often used in engineering. However, the quality problems caused by the internal insulation of the external walls also follow.

One of the obvious features of metal embossed plates is that the existence of structural cold (hot) bridges causes the local temperature difference to be too large, resulting in dew condensation. Since the position of the internal thermal insulation protection is only on the inner wall and the inner side of the beam of the building, the part of the outer wall corresponding to the inner wall and the board cannot be protected by the thermal insulation material. Therefore, a cold (hot) bridge is formed in this part, and the indoor wall in winter The temperature difference between the temperature and the indoor corner (the intersection of the insulated wall and the non-insulated board) is about 10°C, and the temperature difference with the indoor can reach more than 15°C. Once the indoor humidity conditions are suitable, condensation can be formed here. . The dipping or freezing and thawing of the condensation water can easily cause mold and cracking of the thermal insulation wall. In addition, in buildings with heating in winter and cooling in summer, the variation of indoor temperature with day, night and season is usually not large (about 10°C). big. However, the temperature of the exterior walls and roofs varies greatly due to the effect of outdoor temperature and solar radiant heat. when the outside temperature

When the temperature is lower than the indoor temperature, the shrinkage of the outer wall is faster than that of the internal thermal insulation system. When the outdoor temperature is higher than the indoor temperature, the expansion speed of the external wall is higher than that of the internal thermal insulation system. This repeated deformation makes the internal thermal insulation system. The thermal insulation system is always based on an unstable wall. Under the repeated action of this deformation stress, not only the outer wall is easily damaged by the temperature difference stress, but also the hollow cracking of the internal thermal insulation system is easily caused.