Exterior wall insulation material

Exterior wall insulation material fire cause analysis is the industry standard is not sound, product quality is uneven. At present, the production and use of external thermal insulation materials are chaotic. The organic thermal insulation materials currently used in the curtain wall construction mainly include polystyrene board (EPS), extruded board (XPS) and polyurethane (PU), which have the biggest advantages of light weight, insulation and good heat insulation. The biggest defect is poor fire safety, easy to aging, easy to burn. The former two are widely used because of low price, while the latter is better in thermal conductivity, construction performance and combustion performance. The industry standard of exterior wall thermal insulation material is not perfect, and there are loopholes in the management of some manufacturers. The external thermal insulation material produced can not meet the requirements of building fire protection design, and the fire resistance grade and fire resistance limit can not meet the national standard. After the product is put on the market, it has buried inherent safety risks for curtain wall structure fire accidents.

Second, the construction period is long, and the operation site is full of hidden dangers. For the construction industry, energy conservation and insulation is a national policy, and wall insulation is an important means to achieve building energy conservation, so the application of building insulation materials is very extensive. In reality, the construction period of high-rise buildings, large stadiums and other buildings is generally two to three years, and various construction processes are overlapping, which makes management inconvenient. Individual managers ignore the investigation and remediation of fire hazards on site and the setting of temporary water for fire fighting, and focus all their energy on catching up with the construction period and reducing costs. In the long construction period of two to three years, there are many combustible materials on site, resulting in the fire hazard is not easy to be found in time. The exterior insulation material of curtain wall has the characteristics of extremely fast spreading speed, hidden combustion, once the fire is difficult to control and so on, and it is easy to cause significant personnel and property losses due to the carelessness of personnel on site.
Three is qualified material cost. The thermal insulation material is divided into (non-combustible), B1, B2 (flame retardant) (flammable), B3 (inflammable) four levels, there are two types of organic and inorganic heat preservation material thermal insulation material, the former feature is non-combustible, but poor thermal insulation effect, only about 20% of the market share, the latter characteristic is heat preservation effect is good, but easy to burn, occupy 80% of the market, therefore, It is necessary to add a certain amount of flame retardants in the material to make it reach the standard of modern curtain wall, and flame retardants are expensive, many businesses in pursuit of profit maximization, some even do not add. Individual construction units deliberately buy inferior thermal insulation materials, shoddy, cost savings, and fire supervision is not in place, which is easy to muddle through.