Insulation materials for external walls of buildings began in January 2011. The Lanzhou Fire Brigade established a special inspection team to inspect some of the construction sites and external wall insulation materials in Chengguan, Qilihe, and Anning. Up to now, a total of 74 construction sites have been inspected and 214 buildings of various types have been found. There have been 30 unlawful acts found without fire design approvals and without fire protection design filings; 52 fire hazards have been discovered and 37 have been ordered to correct immediately; 12 violations have been made The units that violated the regulations were investigated and put on record, and six â€œthree-stopâ€ units were ordered to make a fine of 317,000 yuan. Two investigations were underway. â€œIn the individual construction projects under construction in Lanzhou City, there is a problem that external wall insulation materials do not conform to the regulations. These construction sites frequently use common benzene boards with poor flame retardant properties, resulting in significant potential safety hazards.â€ Lanzhou City Fire Brigade Fire Protection Department Staff said.
Insulation material insulation is not safe May 23, the reporter saw a number of construction sites in Lanzhou, the workers are affixing a block of blue insulation benzene board nailed to the wall of the building, the insulation board is fire-retardant, the reporter came forward After the enquiries, the answers were all â€œI donâ€™t know.â€ Some workers stated that they were only responsible for the installation and that they did not care about whether they were fire-retardant. â€œAt present, there are many materials for exterior wall insulation, and there are three major categories, one is inorganic insulation materials, such as glass wool, although there is no fire safety problem, but the insulation performance is poor. The other is the organic and inorganic composite insulation The material is mainly made of rubber powder polystyrene heat-insulating material, which is a kind of flame-retardant material, and the third type is an organic polymer heat-insulating material, mainly made of polystyrene foam and polyurethane rigid foam, which is a combustible material and has a fire. Dangerous." Lanzhou City fire brigade, a fire protection staff said. Benzene board, scientific name (double-sided) steel wire frame polystyrene board, both construction materials and decorative materials, are widely used in building insulation and other fields, benzene board for external wall insulation, to a certain extent, can solve the housing warmth, However, the existing problems of fire safety cannot be ignored.
The burning performance should not be lower than Class B2. On September 25th, 2009, the Ministry of Public Security and the Ministry of Housing and Urban-Rural Development jointly issued the Provisional Rules for the Fire Protection of Civil Building Exterior Insulation Systems and Exterior Wall Decorations, which strictly enforced the combustion performance level of the building exterior insulation materials. Regulations: The burning performance of exterior insulation materials for civil buildings should be Class A, and should not be less than Grade B2. A grade is non-combustible material, B2 is combustible material, flammable is obviously different from flammable. The height of a residential building is greater than or equal to 100 meters, and the combustion performance of the insulation material should be Class A; where the height is greater than or equal to 60 meters and less than 100 meters, the burning performance of the insulation material should not be lower than Class B2. If using Class B2 material, a horizontal fire barrier must be provided on each floor.
According to the law enforcement personnel of the Lanzhou Fire Brigade, they are strictly implementing the relevant requirements of the â€œTemporary Regulations for Fire Protection of Civil Building Exterior Insulation System and Exterior Wall Decorationâ€ in the inspection of the external wall thermal insulation materials; if they do not meet the requirements, they shall be ordered to build units. Rectification; Where it is found that construction, design, construction, and project supervision units have legal responsibilities, according to the "Fire Law" and other relevant laws and regulations, all shall be severely punished; Any person who cannot determine the combustion performance of external insulation materials of buildings shall be implemented according to law. Inspection.
How to detect insulation material?
Then, in life, how should we identify the quality of the insulation material? Lanzhou City fire brigade key science and engineering engineers give a correct test of whether there is flame-retardant insulation materials approach, the flame retardant test material is usually used as a lighter, etc. The ignited fire source is relatively easy to use for alcohol torches, but it is not rigorous enough. After all, the heat released by the lighter and the height of the flame cannot be compared with the alcohol torch. The non-flame-retardant extruded board will soon be ignited, and once it is burned, the flame will become more and more intense.
At the same time, some manufacturers use the plane ignition method to determine their flame retardancy. If the extruded board is cut into square square structures, it is less likely to be ignited at the edges or in the plane. This method is very Large deceptiveness may cause people to mistakenly regard it as flame retardant, but if the extruded board uses the same environment to ignite corners, it may not be flame retardant, or the flame retardancy will be significantly reduced and the combustion will be drastic.
It is a good thing for both the energy conservation and environmental protection of the building to wear "insulating coat." However, the Lanzhou Fire Brigade found in the safety inspection of the flammable and combustible external insulation materials of the buildings that 52 of the 214 buildings that were inspected were found to be involved in 52 fires. Department. The reporter's investigation found that, in order to reduce the construction cost, the merchants used a large number of â€œcommon platesâ€ without flame retardants, and flammable insulation boards were affixed to the external walls of the buildings under construction, which buried potential safety hazards while saving energy.
In order to reduce costs, businesses use a large amount of common benzene plates without flame retardants. According to the investigation, there are many problems in the external insulation materials of Lanzhou buildings, and there is no hidden danger of flame retardants.