Exterior insulation technology should be actively promoted

5. As mentioned above, due to the difference between the insulation materials used in the internal insulation structure, the internal insulation structure will inevitably increase the construction cost, and it will occupy more area for use. According to incomplete statistics, the use of 1.3-1. 5m2 of space was lost in each of the towers' high-rise buildings, which is equivalent to “spend money”.

6, affect the residents of the second decoration. Today's housing construction principles are initially renovated, this policy is reasonable, let's not talk about this, but the second decoration is a common phenomenon, even if the unit housing renovation is in place, the residents will also retrace, internal insulation will be destroyed, Frequently seen. The quality of the current construction team is generally not high, and the untrained migrant workers in the field have no evidence. After the post is completed, the internal insulation structure is destroyed after the inner insulation process is completed, and the subsequent process is also very common. Finally, cement mortar is often used as a repair.

7. In the engineering design, it is unavoidable to hang or fix objects on the inner surface of the external wall, such as the installation of radiators, air conditioners, curtain boxes, and pipeline cards. The thicker the internal insulation material is, the more difficult it is to install, and the possibility of damage will also occur. The bigger. All of the above shortcomings and problems indicate that the internal thermal insulation technology can no longer meet the needs of building energy conservation development and should be phased out.

II. Scientific rationality and potential economic advantages of external thermal insulation technology In summary, it can be considered that the main problem of internal thermal insulation technology is that the thermal insulation form is irrational and unscientific. It is a backward transitional thermal insulation form. In the future, it will be replaced by a more scientific and reasonable external insulation technology or other forms. Compared with internal insulation, the scientific rationality of the construction of external insulation technology is obvious. Such as: 1, potential economic advantages. Some developers also know that external insulation is reasonably advanced, that is, there is no money. Their traditional concept is to determine that internal insulation is cheaper than external insulation. This is a one-sided view. At present, there are already more advanced, more economical and more reasonable external insulation technologies than internal insulation. Now we compare the use of wood between the internal insulation and the external insulation and the use of space. As mentioned above, the internal insulation is more than double the internal insulation material, and the external insulation material cost is about 15 RMB/m2 (wall surface). Net use area, external insulation than the internal insulation increased by 1.3m2-1.5m2 households (inner insulation thickness in the conservative 60imn). If the unilateral building cost of the building is 1,000 yuan, the investment is 1300 yuan - 1,500 yuan. If the selling price of the commercial housing is 5,000 yuan/m2, the external insulation of the wall can be increased by 100 yuan - 115 yuan per household without investment. For example, if the ratio of the building area to the wall area is 1:0.5, the equivalent area to the wall is 50 yuan -57. 5 yuan/m2, and the total cost of materials is 65-72.5 yuan. Of course, the traditional way of installing external thermal insulation board is lower than that of internal thermal insulation. Even so, the internal insulation of comprehensive economic cost is at least equivalent. For example, the latest external thermal insulation technology that uses a thermal insulation board and the main concrete wall to make a living once is used. Certainly more economical than internal insulation.

2. The main advantage of the external thermal insulation technology lies in the scientific rationality of its structural form. The external insulation structure completely eliminates or weakens the influence of various parts of the “thermal bridge”. According to relevant statistics, the additional heat loss of the “external wall” along the outer wall of the ground floor room accounted for about 23.7% of the total heat loss of the room, 21.7% of the middle room along the outer wall room, and the top floor occupied about 24 walls. 3%. It can be seen that the heat loss due to the "thermal bridge" is considerable. As mentioned above, according to the study of relevant experts, the use of internal thermal insulation technology, the subject part of the heat transfer coefficient and the average heat transfer coefficient to be a 1.8-2.0 coefficient difference, and the use of external thermal insulation technology, the gap is very small, almost .

3, to improve the comfort of the indoor environment. Due to the use of external insulation, the thermal stability of the inside of the wall is also increased. When the temperature of the indoor air rises or falls, the inside of the wall can absorb or release more heat, which is conducive to the stability of the room temperature, thus the indoor thermal environment. Improved.

4, can effectively maintain the main structure, extend the life of the building. Since the insulating layer is placed on the outside of the main structure, the stress caused by the temperature deformation of the main structure and the ultraviolet and harmful substances in the atmosphere erode the wall are reduced, thereby improving the durability of the main structure.

5, energy-saving effect is good. Because of the comprehensive insulation of the outside of the wall, the insulation and airtightness of the building are blocked, which not only helps to save heating energy in winter, but also helps to save heat in summer and save air-conditioning energy consumption.

6, can increase the effective space of the building. As mentioned above, according to rough estimates, if the internal thermal insulation thickness is 60mm, the tower-shaped high-rise residential can increase the usage area of ​​1.3-15m2 per household. In fact, even if the use of poly-studs, 240mm brick wall should be 80mm thick, such as the external wall With 180-200 concrete walls, it may exceed 100mm, so that the area occupied may reach 1.7-1.8m2. To use the area for sale, the Beijing Municipal Committee and the First Committee has issued the document number for the establishment of the Commission in 462 in October 1998. No. 5: "The Notice on Calculating the Sale Price of the Use of the Area for the Construction of New Residential Real Estate Housing House" clearly stipulates that the development department should make the sale of the house according to the use area. Although this policy is currently not fully implemented, it is only a matter of time. As China's market economy continues to mature, the buyer-centered buyer’s market will, in order to protect its own interests, measure its own purchases, expedient gains and losses, and choose favorable options. We believe that the vast majority of consumers will never choose a scheme that is unfavorable to their own interests. Of course, the mentality of developers will not be an exception.

7, the overall construction speed is not slower than the internal insulation. As mentioned above, one of the disadvantages of internal insulation is that most of the internal processes after the completion of the main structure can only be completed after the internal insulation is completed, and the crossover operation will affect the construction period, while the external insulation will not have this drawback, and the internal and external operations can be performed simultaneously. The integrated duration is not necessarily longer than the internal insulation. If external insulation is used and advanced technology of one-step casting of the wall is used, the duration will be greatly shortened compared to internal insulation. From an overall and macro perspective, external insulation is undoubtedly a scientific and reasonable insulation technology. But in the specific design and selection system must also be cautious, such as: 1 because the insulation material placed outside the outer wall, year round to accept the test of the sun and the weather, so be sure to choose good weather resistance, low water absorption, low temperature deformation of the light Quality and efficient insulation materials, but from the current situation, some hand-style products that have not passed the formal appraisal of quality and low cost are still flooding the market, the outer surface of the external insulation structure cracking is still common. 2 The external thermal insulation technology not only requires the quality of the material itself, but also the corresponding supporting materials and construction technology. If using the hanging form, the corresponding anchoring parts, bonding materials, plaster mortar, reinforced glass fiber mesh and other technologies Performance standards, should be done in accordance with regulations. 3 Should also keep up with the software, from the quality of the board, the design method, the construction process to the inspection and acceptance index should be based on law, should not be used in isolation of a certain materials and practices, but should be regarded as a system, Therefore, in choosing the form of foreign insurance, inequality is the choice of materials and practices. What's more important is whether or not this system is comprehensively improved.

1. External insulation in the external wall is a backward transitional energy-saving and energy-saving technology and should be eliminated.

2. The external wall insulation is a scientific and reasonable thermal insulation and energy saving technology. Its comprehensive economic efficiency is not inferior to the internal thermal insulation. When using some advanced technologies, it is even better than the internal thermal insulation technology.

3, in the promotion of external thermal insulation technology supporting the hardware and software to keep up with the time, so that there are rules to follow, there are laws to follow, to ensure project quality, technology, economy and energy efficiency.

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