Internal insulation is to place the insulation system inside the outer wall so that the inner and outer walls are divided into two temperature fields. The main structure is always in an unstable state due to thermal stress, resulting in shortened service life. In the same climatic conditions, the internal insulation is not only more than the external insulation or even the insulation, the temperature difference between the outer wall and the internal structural wall is greater, and it is more directly affected by various external forces. The exterior wall is more susceptible to damage from temperature and stress.
In winter heating and summer cooling buildings, the indoor temperature varies little with day and night and seasons (about 10 °C). This temperature change causes linear deformation and volume change of the interior walls and floors of buildings. . However, the external wall and roof are subject to a large temperature change caused by the outdoor temperature and solar radiant heat (the temperature difference between day and night can reach 20~40 °C, and the annual temperature difference can reach 80~100 °C). When the outdoor temperature is lower than the indoor temperature, the external wall shrinks faster than the internal thermal insulation system. When the outdoor air temperature is higher than the indoor air temperature, the external wall expands faster than the internal thermal insulation system. This repeated deformation makes the internal thermal insulation system always On an unstable wall basis. According to the data and the actual test, the concrete wall surface of the 6m opening has a deformation of about 4.8mm under the condition of the annual temperature difference of 80 °C. The repeated action of such deformation stress not only makes the outer wall susceptible to temperature and stress damage, but also easily causes the internal thermal insulation system to crack.
In addition, the presence of cold (heat) bridges in the internal insulation structure may cause local condensation to cause condensation, and the impregnation or freeze-thaw of the dew condensation water may cause mold and cracking of the insulation wall. At present, many households are mostly renovated when they enter new houses. During the decoration, the installation of furniture into the insulation layer inside the house is often destroyed, and it is not easy to repair after the damage. It is precisely because of the inherent defects of internal insulation that the cracks in the inner thermal insulation wall become a common phenomenon, and the internal thermal insulation cracks are always in the eyes of the residents, which will have long-term and strong influence on the aesthetics and psychology of the residents, and become the focus of complaints.
Therefore, from the structural design point of view, the internal insulation makes the outer wall, the roof and the inner wall are in different temperature fields, the main structure is always in an unstable state and cracked, and the life of the building is shortened accordingly.
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