In home decoration, it is very necessary to understand certain solutions to insulation wall problems and gypsum mortar insulation materials, so that you can choose and purchase cost-effective insulation walls and gypsum mortar insulation materials, so that your home decoration can meet your expectations. . So now let the editor take you to learn more about insulation walls and gypsum mortar insulation materials.
Treatment of Insulation Wall Problems
1. The insulation layer falls off
Due to the quality of the materials used, carelessness in the construction process, etc., the exterior wall insulation panels are prone to displacement. , hollowing and falling off, the slurry insulation layer has hollowing and falling off. If not treated in time, the insulation effect of the wall will be greatly reduced.
1. Grassroots structural factors. The exterior wall of the frame structure is prone to damage to the insulation layer due to deformation of the masonry at the joints between the concrete beams and columns and the masonry. Scaffolding openings and other openings are not solidly built, causing partial base layers of the insulation layer to be weak and damaged. The decorative components of the exterior wall are not firmly fixed or displaced, causing a push-pull effect, causing the insulation layer to partially hollow out, causing cracks and long-term water seepage, eventually causing the insulation layer to fall off.
2. Improper anti-stress measures. The surface load of the insulation board is too large, or the negative wind pressure resistance measures are unreasonable. For example, in coastal areas or high-rise building exterior walls using non-nail bonding methods, it is easy for the insulation board to be damaged by wind pressure and hollow out.
3. The wall interface is not handled properly. Except for clay brick walls, all other walls should be treated with interface mortar before applying slurry insulation material. Otherwise, it is easy to cause the insulation layer to hollow directly or the interface treatment material to fail, resulting in hollowing of the interface layer and the main wall, and jointly forming a void in the insulation layer. drum. The surface of the insulation board also needs to be treated with interface mortar, otherwise it will cause local hollowing of the insulation layer.
2. Cracks in the plaster layer
The exterior wall insulation plaster layer is composed of gypsum mortar and reinforcing mesh. The gypsum mortar is divided into bottom layer mortar and surface layer mortar. When constructing the surface layer, first apply the bottom layer of mortar on the surface of the installed external insulation board, add a reinforcing mesh, lightly apply the reinforcement mesh into the bottom layer of mortar, and then apply the surface layer of mortar on top. The thickness should not be less than 3 mm. It must be Show off your skin but not your net.
Gypsum mortar, also known as anti-cracking mortar or anti-cracking mortar, plays a key role in the entire exterior insulation system, building a reliable reinforced protective layer for the exterior insulation board. The cracked plaster layer cannot solve the problems of thermal insulation, heat insulation, wind pressure resistance, fire prevention, freeze-thaw resistance, waterproofing, weather resistance, flame retardant, breathability, cracking and other problems of external insulation.
1. Material factors. The density of the insulation board for exterior wall insulation should be 18-22kg/m3. Some construction units will use inferior insulation boards below 18kg/m3, which are not dense enough and can easily lead to cracking of the gypsum mortar layer. The natural shrinkage time of insulation boards is as long as 60 days in the natural environment. Due to factors such as capital turnover and cost control of production companies, insulation boards that have been aged for less than seven days are already installed on the wall. The result is that the insulation boards after being installed on the wall As the shrinkage continues, the gypsum mortar layer adhered to the insulation board is pulled apart.
2. Construction technology. The flatness of the base surface is too large, and the use of adhesive thickness, multi-layer boards, surface grinding and leveling and other adjustment methods will lead to defects in the quality of the insulation. Dust, particles and other substances on the surface of the base layer that hinder the adhesion are not treated at the interface. The bonding area of the insulation board is too small, does not meet the specifications, and cannot meet the quality requirements of the bonding area. If the rice-surface mortar layer is constructed under exposure to the sun or high temperature, the surface layer will lose water too quickly, resulting in cracks.
3. Temperature difference changes. The thermal conductivity of the two layers of expanded polystyrene board and anti-crack mortar is different. The thermal conductivity of expanded polystyrene board is 0.042W/(m·K), and the thermal conductivity of anti-crack mortar is 0.93W/(m.K). The difference is 22 times. When the sun shines directly on the surface of gypsum mortar in summer, the surface temperature of gypsum mortar can reach 50-70°C. In the event of sudden rainfall, the temperature of the mortar surface will drop to about 15°C, and the temperature difference can reach 35-55°C. This temperature difference, the difference in day and night temperatures, and the influence of seasonal temperatures lead to large deformation differences in the gypsum mortar layer and are prone to cracks.
Inventory of Gypsum Mortar Insulation Materials
First: XPS extruded polystyrene foam board. Also known as extruded polystyrene board (XPS for short). It has a perfect closed-cell honeycomb structure. Its density, water absorption, thermal conductivity and steam permeability coefficient are lower than other types of plate insulation materials. Therefore, it has good strength, light weight, airtight, corrosion resistance and anti-aging. , low price and other characteristics, it is widely used in thermal insulation in the construction industry, antifreeze insulation in roads, railways, airports, squares, home decoration and other fields.
Second: Gypsum mortar. Gypsum mortar is a kind of ready-mixed dry mortar made of various lightweight materials as aggregates, cement as gelling material, mixed with some modified additives, and stirred and mixed by the production enterprise. Mainly used for building exterior wall insulation, it has the advantages of convenient construction and good durability.
Third: phenolic foam. Phenolic foam is internationally recognized as the most promising construction industryA new type of thermal insulation material. Because this new material is fundamentally different from the usual polymer resin materials obtained by adding flame retardants. It does not burn or melt in a fire, nor does it emit toxic smoke. It is also lightweight, non-toxic, and non-toxic. Corrosion, thermal insulation, energy saving, sound insulation, low price and other advantages
Fourth: EPS board. EPS board, also known as benzene board and foam board, is the abbreviation of expandable polystyrene board. It is made of expandable polystyrene raw material (Expandable Polystyrene) through pre-expansion, curing, molding, drying and cutting. It can not only make foam plastic products of different densities and shapes, but also produce foam boards of various thicknesses. </p
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