At present, the curtain wall design and construction in the industry to form a misunderstanding, whether it is Aluminum Plank or stone curtain wall, where the curtain wall exposed surface of the gap between the unit plate, are coated with weathering silicone sealant, and the more stringent the better. If you do not glue, he said you cut corners, the concept of the development of the curtain wall in China today, in some owners and even a lot of curtain wall technology workers have been formed in the mind. Resulting in the standard specification quality is not high, low level of products, manufacturers shoddy, the installation of Aluminum Plank curtain wall outward deformation. Although there are architects and consultants to ask the curtain wall using the slit system, but the construction manufacturers construction technology, construction costs and other reasons, often difficult to implement or implement the effect is not ideal, of course, some owners found that after the seam, such as the northern weather more serious , There is a lot of fouling between the fouling, as well as between the sewn waterproof design and construction is not reasonable, resulting in serious leakage, the latter have to rectification. So the slit system has not really a wide range of use.
As the name suggests, this wall is the main function of insulation, that is, indoor and outdoor heat exchange has a certain role in blocking the wall, such as both inside and outside by the Aluminum Plank or other metal plate composition, the middle of the use of polyurethane, polystyrene Or rock wool and other insulation materials composite insulation wall; and then the building outside the envelope used in the hidden frame glass curtain wall, all-glass curtain wall, point-type connection glass curtain wall. These walls like pouring concrete and brick wall made of the same, blocking the indoor and outdoor shielding only a shield belt, do not allow indoor and outdoor air in the shield on the tape to produce convection, so the process must be sealed on the wall May cause all the cracks in the air penetration, and to ensure that the use of a permanent seal.
This kind of cold wall on the construction of two roles, one is to contrast the architectural effect, the second is to prevent the erosion of the surface of the building erosion erosion, improve the durability of the building. From the material on the majority of Aluminum Plank, stone, glass and other materials, the use of the majority of the building is not lighting the structure of the outer surface; from the structural requirements and building structures to maintain a certain interval, anti-rain leakage using isobaric design, Leaving the air exchange channel, keep the curtain wall and the building structure within the dry, dewdrop easy to discharge. Comparison of modern open hot channel curtain wall, the actual principle is in the original insulation wall outside the curtain wall and add a decorative wall system.
Whether the outer layer of Aluminum Plank or stone, there is a layer of the barrier will be due to temperature and condensation, curtain wall connector will produce corrosion, especially between the two different metal connections due to different potential differences in the dew condensation of the medium Electrochemical corrosion, resulting in relaxation of the curtain wall structure and reduce the service life.
Especially the outer layer of Aluminum Plank or slate coated with anti-corrosion paint on the back, the board itself is airtight, the board all the cracks and then blocked, if the board and the wall spacing greater than 40mm, will have a chimney effect, Speed up, to promote the interval in the concentration of moisture increased, then if the insulation layer of the moisture barrier is not strict, will cause the moisture content of insulation material saturation and loss of insulation effect.
Some projects due to economic factors, it is necessary to have a good surface to spend the money and not more, in the civil structure of the outer side of the insulation layer and waterproof layer, curtain wall and structural wall in the interval of moisture due to Aluminum Plank or coated with stone Layer is very dense (seam between the glue treatment), can not volatil to the outside, only through the concrete or brick wall to the indoor penetration. After the high-end decoration of the residential wall in the indoor side are generally added a layer of plywood, infiltration of indoor moisture can not be volatile, especially the humidity of the kitchen and often open the warehouse, when the solar terms after the rise, Into the nose of the mold gas, seriously damaged the living room environment.
Condensation of a large number of deposition in the ground floor of the first floor and penetrate the wall, will cause the wall to reduce thermal resistance, wall base premature powder, reduce the service life.
Aluminum Plank curtain wall in the season temperature difference between the larger areas, in the spring and early autumn temperatures lower season, when the sunshine heat is very strong, especially the darker Aluminum Plank deep heating, Aluminum Plank at different temperatures, the length per meter The thermal expansion value is larger
Curtain wall frame in the inside, the sun is weak, Aluminum Plank and the maximum frame can produce more than 80 ℃ temperature difference in the Aluminum Plank plate when the larger size will appear a larger linear expansion difference. If the curtain wall plate structure with a fold, the Aluminum Plank plate with screws fixed on the frame structure (see Figure 3), will cause the Aluminum Plank plate surface thermal stress can not be released, forcing the board yield, in the air under the deformation phenomenon.