External wall insulation is mainly based on thermal insulation materials as a building envelope, and the development and application of efficient thermal insulation materials is an effective measure to ensure building energy efficiency. At present, all developed countries in the world attach great importance to the production and application of thermal insulation materials.

External wall insulation is the use of benzene board, insulation mortar and other insulation materials inside the exterior wall, so that the building to achieve thermal insulation and energy saving construction methods. The construction method has the advantages of convenient construction, low requirement for the verticality of the external wall of the building, and quick construction progress.

Inside and outside mixed insulation, is in the construction, external insulation construction easy to use the external insulation, external insulation construction inconvenient for internal insulation. Although mixed insulation can increase the construction speed, the mixed insulation has serious damage to the building structure. The location of the external insulation makes the structural wall of the building mainly affected by the temperature of the room, and the temperature change is relatively small, so the wall is in a relatively stable temperature field, and the generated temperature stress is relatively small; the part of the internal insulation practice makes The structural wall of a building is mainly affected by the temperature of the outdoor environment, and the outdoor temperature fluctuates greatly, so that the wall is in a relatively unstable temperature field, and the generated temperature stress is relatively large.

External wall insulation is to put the thermal insulation system on the outside of the external wall, so that the temperature difference between the main structure is greatly reduced, the temperature deformation is reduced, the thermal bridge can be effectively blocked, and the structure life is prolonged. From the aspect of favorable structural stability, external thermal insulation should be the preferred choice. As the external thermal insulation system is placed on the outside of the external wall and directly subjected to various factors from the natural world, external wall external insulation systems have put forward higher requirements.

III. Advantages and Disadvantages of External Wall Insulation Technology External wall external insulation is to install insulation layer (usually a polyphenyl foam plate with a thickness of 60mm) on the outside of the base wall of the building, and to make a decorative layer outside the insulation layer. The base wall and the polystyrene board are connected with a special adhesive, and the polyphenyl board is fixed with a nylon anchor bolt. Then, the polymer cement mortar protective layer is applied on the insulation layer, and the alkali-resistant coated glass fiber mesh is pressed into the insulation layer. The outermost layer is leveled and decorated with anti-crack putty and paint.

1 The advantages of the external wall thermal insulation technology According to the actual use effect of external wall thermal insulation technology, it is found that the technology has the following advantages: (1) The energy-saving effect is obvious. (2) The thickness of the wall can be reduced and the weight of the wall can be reduced, thereby increasing the area of ​​use of the house. (3) It can increase the comfort of indoor environment and prolong the service life of buildings. As the external thermal insulation technology is adopted, the thermal storage function of the wall is increased. When the outdoor temperature changes, the thermal storage of the composite wall can buffer the change of the indoor temperature, making people feel relatively comfortable; and due to the temperature of the base wall The change becomes more gradual, the thermal stress generated is also greatly reduced, and the possibility of cracks and changes in the base wall is reduced. Therefore, the service life of the building can be prolonged. (4) The construction process is simple and the use range is wide. This technology is used both in multi-storey buildings and in high-rise buildings; by adopting certain technical measures and techniques, it can also meet the decorative requirements of building facade design.

2. The disadvantages of the external wall insulation technology Although the technology has many of the above advantages, but also found in the use of certain problems, there are: (1) compared with the ordinary wall structure higher cost.

Because this technology has not been widely used in a wide range, due to the influence of batches and raw materials, the prices of main materials, such as polyphenylene plate and auxiliary material adhesives, and trowel adhesives, are relatively high. According to different regions, compared with ordinary wall structures, the cost of external walls per square meter is 30%-40% higher; (2) The matching requirements between main and auxiliary materials are relatively high, and the procedures are relatively high. More time, longer duration. In order to ensure the quality of the project, there must be good compatibility between the polystyrene board and the bonding material, the anchoring material and the outer coating, and the construction process is also relatively large, and the construction period is relatively long.

Although the external wall insulation technology still has its shortcomings in promotion and application, with the continuous improvement of technology and the continuous improvement of the national requirements for building energy conservation, it will surely be applied more widely.

At present, China is in a period of rapid urbanization and industrialization. Both the total amount of existing buildings and the newly-built construction area are very large. However, the percentage of buildings that can meet building energy-saving standards is very low, resulting in great waste of energy. However, the energy-saving potential is also high. Great. Therefore, it is of great practical significance and long-term significance to actively develop and vigorously promote new building energy-saving technologies, improve people’s living environment, reduce building energy consumption, build a conservation-minded society, maintain sustainable development of the national economy, and ease the contradiction between energy supply and demand. The social significance.

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