A brief discussion on the exterior insulation structure of EPS exterior wall. Lang Fubo (Mudanjiang Huawei Construction Engineering Co., Ltd.) In China's past project construction, the most commonly used wall materials are clay bricks, hollow blocks, aerated concrete blocks, etc. In order to satisfy people that in the harsh winter they will not feel very cold, the walls will be thickened, which is neither reasonable nor economical. In order to reduce the amount of clay bricks, save land and resources, strengthen the insulation of buildings, and promote energy-saving buildings, external insulation technology has been widely used.
External wall insulation refers to the general wall and a layer of thermal resistance material compounded into a new type of building envelope structure. It has the dual functions of bearing and heat insulation. The external wall insulation can be divided into two forms, one is wall insulation. Second, the wall insulation, after more than 10 years of practice, China's building wall insulation has been transferred from the internal insulation to external wall insulation, this is because: the use of external insulation, the internal structure is protected, indoor climate change caused The large temperature change inside the wall occurs in the outer thermal insulation layer, so that the internal main wall temperature changes slowly and the thermal stress decreases. As a result, the risk of cracks, deformation, and breakage of the main wall is greatly reduced, and the service life is prolonged.
External insulation can avoid thermal bridges, do not do wall insulation, the external wall must bear the weight but also the insulation effect, the wall is bound to be thick, the use of thermal resistance composite, the thickness of the wall thinning, but if the use of internal insulation, The thinner the wall and the thicker the insulation layer, the more serious the problem of thermal bridges. In the cold winter, the thermal bridge will not only cause extra heat loss, but also may cause the internal surface of the external wall to be wet and fogging, while the external insulation does not exist. The problem is that because the external wall avoids the thermal bridge, the external insulation will lose 20% less than the internal insulation heat loss under the same thickness of insulation, thus saving energy.
After the insulation is performed, due to the large internal wall heat capacity, the interior can accumulate more heat so that the indoor temperature changes slowly with the outdoor temperature, the room temperature is relatively stable, the person feels more comfortable, in the winter, the solar radiant heat, The heat generated by human body heat dissipation and electrical heat dissipation is better utilized and is conducive to energy saving. In summer, the external insulation can reduce and the entrance of radiant heat causes the surface temperature of the external wall to be reduced. It can be seen that the external insulation is conducive to the construction of warm winter and cool summer. .
It is difficult to install curtain boxes and hanging objects on the wall with inner insulation, and it is also easy to destroy the inner insulation layer during interior decoration, and the outer insulation can be normally constructed.
The overall economic efficiency of external insulation is high. Although the external insulation project cost per square meter is relatively higher than the internal insulation, but as long as the technical choice is appropriate, there is not much high per unit area, especially because the external insulation increased the use of the area of ​​nearly 20 % is actually a reduction in the cost per unit area. The external thermal insulation has the above characteristics. The external thermal insulation technology has gained people's attention. Through the introduction and exchange of foreign technologies, combined with the actual situation in China, domestic and foreign thermal insulation new products are constantly appearing, and technologies and applications are increasingly perfect.
There are many types of external insulation, such as EPS external insulation, plastic powder polystyrene insulation insulation, steel wire mesh insulation, rock wool insulation and so on. Among them, the EPS external thermal insulation wall is widely used in China. It is a kind of flame-retardant, self-extinguishing type polystyrene foam sheet, and is adhered to the wall through a polymer anti-cracking mortar and an alkali-resistant glass fiber reinforced grid cloth. On the external wall insulation structure. The advantages of this type of wall are: First, significant energy savings. As a result of the use of low thermal conductivity EPS board, the overall package of the building up, eliminating the thermal bridge, thermal insulation energy-saving effect can reach 50%. Second, light. By using this material, the original 49cm wall and 37cm wall can be reduced to 24cm. This not only reduces the number of masonry projects, shortens the construction period, but also reduces the weight of the building.
Third, stick firmly. The wall is made of high elasticity and strong adhesive base material, so that the EPS board has a reliable attachment effect, and has strong weather resistance and durability.
Fourth, strong water resistance. Because of the high elasticity and integrity of the wall, it solves the common problem of wall cracking and surface water seepage.
In addition, the EPS exterior wall thermal insulation wall has the advantages of flame retardant, anti-fouling, strong plasticity, and easy construction. Applicable to a variety of wall exterior wall insulation building.
The quality problems caused by the construction operation of the EPS external insulation facing wall are the most common in the external insulation engineering. Standardizing the construction operation process and strengthening the quality control in the construction process is an important means of ensuring the quality of the external thermal insulation project.
First of all, the treatment of the basic wall: the wall should be leveling layer, using 1:3 cement mortar leveling, the surface flatness in the smoothing of the outer wall of the vertical lines and horizontal lines, marking the location of the EPS board paste.
Above 0kg/m3, the aging time under natural conditions shall not be less than 42 days, which is a flame-retardant benzene board.
Spread the prepared adhesive mud around the EPS board with no steel pound trowel. The mud width is 50mm and the thickness is 10mm. When the standard size polystyrene board is used, the cement mortar should be evenly arranged at the middle of the board. . Each point has a diameter of 100mm, a thickness of 10mm, and a center distance of 200mm. After the EPS board has been wiped off with glue, the board should be affixed to the base wall and then slide in place. The action of the paste should be gentle and evenly squeezed. In order to maintain the flatness of the wall, leveling operations should always be performed with a ruler with a root length exceeding 2 meters.
The EPS boards shall be pasted from the bottom up and laid horizontally in the horizontal direction. Each row of boards shall be staggered with each other. The upper and lower boards shall be staggered by 1/2 board length. When pasting polystyrene board, the board seams should be tightly squeezed, adjacent boards should be flush, the gap between the boards should not be greater than 2mm, the height difference between the boards shall not be greater than 1.5mm, when the board gap is greater than 2mm, the polystyrene board strips will be used Full, the slats shall not be bonded, and the joints shall not be directly filled with adhesives. The locations where the height difference between the plates is greater than 1.5 mm shall be polished and leveled.
When cutting benzene plates, ensure that the edges of the cuts are straight and tidy, and the cutting quality cannot meet the requirements of the installation. Repairing the integrated reticle is not allowed on the walls.
After the polyphenyl board is pasted, it is allowed to stand for at least 24 hours before being ground with coarse sandpaper, and then the entire EPS board surface is polished again.
Once again, install the fixture: drill on the affixed benzene board with a percussion drill. The hole is deeper than the base surface of the wall is not less than 2mm, the number of the polystyrene board per square meter is not less than 3, and the distance between the moldings is 500mm. Installation 1 One.
When the polymer mortar is applied, the surface of the polyphenylene plate should be kept dry and flat, and harmful substances and impurities on the plate surface should be removed.
Spread evenly a layer of polymer mortar with a surface area slightly larger than a grid cloth on the surface of polyphenylene. The thickness is about 1.6mm. Immediately press the grid cloth into the wet mortar and apply it to the second mortar after the mortar is slightly dry. The mortar was covered until all the grid cloths were covered, and there was no visible grid pattern on the screen. If there is a bare mesh, it should be repaired by applying a suitable amount of mortar.
The grid should be laid along the exterior walls from top to bottom.
A 300mm grid cloth is laid along the 45* direction at the four corners of the door and window openings to prevent cracking.
The standard grid cloths should overlap with each other at least 100mm. The outer wall sunk angles directly overlaps 200mm. After all the mortar and grid cloths are laid, at least 24 hours of standing and maintenance is allowed before the next process can be carried out under wet weather conditions. Next, you should also extend the maintenance time.
EPS external wall thermal insulation structure is a scientific research achievement of new materials, new technologies, and new processes in the construction industry. The practice has proved that this process system is more suitable for China's national conditions and can be accepted by the majority of users. Therefore, strengthen the control of the quality system, follow the external thermal insulation technology requirements, formulate a reasonable application of technology programs, ensure the quality of the project, in order to build more and better exterior thermal insulation and energy-saving buildings.
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Stand Dragon Industrial Co., Ltd. , https://www.standdragontw.com