What is very general is that mesh lapping is not enough in these parts, and tips are treated improperly or palster mortar is not sealed closely, thus causing rain leakage and even thermal bridges. In recent years, domestic completion of the new building has many wall leakage in windowsill, gutter spout funnels, cornice,etc. due to poor thermal insulation construction. And to stop leakage is very difficult because the leakage point is not easy to be found. 4. Due to unfirm pasting of polystyrene board, there are more and more quality problems. The most serious situation is the falling-of accident of polyphenyl board, and the reason is: a. Poor quality of construction and insufficient cement pasting area cause falling off; b. mishandling of the old wall; 5. Using unqualified materials. a. Use neutral or low-alkali fiberglass mesh. b. The volume-weight of polystyrene board is not enough. Its compressive strength and shear strength are low. c. No use of polymer cement bonding. d. Cement strength level is not enough. Solutions (a) the choice of adhesive mortar
With the rapid spread of exterior wall insulation technology, there is also something unsatisfied. Currently widely used polyphenyl board thin plaster exterior insulation system has the following disadvantages: 1. Some cracks in the outer surface of the plaster paste polystyrene board exterior insulation work was completed in a relatively short time, the external walls of thin plaster on the table cracks, especially horizontal, vertical seams in polystyrene board, often produce long horizontal cracks and longitudinal cracks. With analysis, the reason of cracking is that the mucilage on plastering layer is too thick and it is not so soft but has large shrinkage; and the other reason is the shrinkage of polyphenyl board. Some construction units has little knowledge about the performance and use requirements of polyphenyl board. These surface cracks affect the appearance of buildings, but also seriously damage the surface layer of protection, affect use function and shorten its service life. 2. Fiberglass mesh is used improperly. In pasting polystyrene board in outer thermal insulation system, fiberglass mesh is to enhance. Its quality and the quality of construction directly affect the durability of the whole system. However, some projects make fiberglass mesh close to the polystyrene board paste, or expose it out of plastering layer mucilage, which are bad for the enhancement of mesh, and causes that the impact strength is not enough and it is easy to have cracks. 3. Node and special parts are handled improperly. There are many parts easy to be problematic, such as windowsill, balcony, awning, cornice, gutter spout funnels, parapet wall, etc. Because these parts are not easy to construct and each has its own method, there are also many bad reflection.
With the rapid spread of exterior wall insulation technology, there is also something unsatisfied. Currently widely used polyphenyl board thin plaster exterior insulation system has the following disadvantages: 1. Some cracks in the outer surface of the plaster paste polystyrene board exterior insulation work was completed in a relatively short time, the external walls of thin plaster on the table cracks, especially horizontal, vertical seams in polystyrene board, often produce long horizontal cracks and longitudinal cracks. With analysis, the reason of cracking is that the mucilage on plastering layer is too thick and it is not so soft but has large shrinkage; and the other reason is the shrinkage of polyphenyl board. Some construction units has little knowledge about the performance and use requirements of polyphenyl board. These surface cracks affect the appearance of buildings, but also seriously damage the surface layer of protection, affect use function and shorten its service life. 2. Fiberglass mesh is used improperly. In pasting polystyrene board in outer thermal insulation system, fiberglass mesh is to enhance its quality and the quality of construction.
Before construction, you should water and wet the wall, and roughen fiber mesh. Lap less than 100mm frame at the corner, and lay exposed grid network.
Precautions: while cleaning, you shouldn't clean too hard, and do not use the sharp tool (steel wire ball) to friction. The daily protection is vital. Do not spray too much water and moisture should be proper. Pay attention to protection. You can hire professional staff to lap for visual effect and beauty.
