The flammable exterior wall insulation material “dust settled”

From the catastrophic fire in the new CCTV building in Beijing in 2009 to the “11·15” fire in Jiaozhou Road in Shanghai last year, and to the devastating fire in this year’s Shenyang Royal Mansion Wanxin Building, both saw that it burned for five or six hours. It was extinguished. The culprit that caused the fire to burn quickly and could not be extinguished is the flammable exterior wall insulation material. In response, several experts proposed that starting with the protection of the safety of people’s lives and property, relevant departments should swiftly order the prohibition of the use of flammable external wall insulation materials to prevent “warm houses” from becoming “fire houses”.

In recent years, with the building energy-saving external wall insulation materials in the country's new residential and commercial buildings, and even part of the transformation of the old house mandatory, its flammable organic materials are also exposed. Inflammable external wall insulation materials frequently cause disasters and major fires that devour life and property have come to an end. Take the three major fires known throughout the country as an example. The CCTV new building under construction uses polystyrene (EPS) as insulation material for external walls, and the Jiaozhou Road Building of Shanghai during “11·15” major fire caused by building renovation. The external wall insulation material used is foamed polyurethane (PU); the Shenyang Qiangwangxin Building, which is in operation, uses an XPS insulation material.

The above three kinds of exterior wall insulation materials are currently used more commonly, and their advantages are low one-time cost, convenient construction, and good insulation performance. However, they are made of organic materials and have a common fatal flaw: they are highly flammable. Even if flame retardants are added to the raw materials, they have a certain flame-retardant effect, but these organic materials are still apt to catch fire. Once the temperature reaches a certain level, it will be difficult to extinguish, causing the fire to quickly spread throughout the building, even more deadly, organic. Insulation materials generate toxic gases when burned, and they die when inhaled excessively. The fire in the Shenyang Royal Mansion Wanxin Building not only confirmed once again that the flammable outer wall insulation material was the “culprit” and contributed to the fire; it also warned people that the building’s residence is also likely to ignite organic exterior wall insulation materials and cause major damage. Fire.

The permanent cure is to prevent fires. The key long-term in the construction industry is the first line of the Deputy Chief Engineer of Shanghai Zhongxing (Group) Co., Ltd. Fu Qikang analyzed the external wall thermal insulation materials in the above-mentioned fires: The first fire on the building requires sufficient air. Partitioning the air is obviously impossible; the second is to have lighted objects, small sparks, welding sparks and other similar trigger sources are often difficult to completely avoid and eliminate, and hard to prevent; the third is the building is burning, if the building Materials are not easy to burn, even if a fire occurs, it will not quickly spread, immediately after taking fire protection measures can be extinguished in time, will never happen to burn for four or five hours. And such disasters can be found everywhere before promoting energy-efficient buildings.

Now, it is certainly not wrong to attribute the cause of the fire to "****" or "scaffolding". However, according to common sense, the high-rise building is so unbearable that it has hit people's expectations. Therefore, it is not an ordinary blasphemy to use **** and electric sparks as the culprit of a fire, but it is impossible to say anyway. With painstaking experience, flammable external wall insulation materials, and fire diarrhea that is difficult to prevent at high altitudes, it is no accident that fires have occurred. Therefore, the focus of the permanent cure must be on the selection of flame-retardant exterior wall insulation materials. This is the source of the problem, and the building must not be re-wrapped with "firewood." Therefore, it is imperative to switch to non-flammable exterior wall insulation. This is the last effective line of defense against the above-mentioned catastrophic fires.

The introduction of inorganic exterior wall insulation materials Originally, flammable high-efficiency insulation materials were used in foreign countries. After a detour, energy-saving materials that are both insulating and fireproof were developed. For example, in the United States, more than 20 states have forbidden the use of polystyrene foam (EPS); in the UK, buildings with walls above 18 meters are not allowed to use EPS board and thin plastering external wall insulation systems; in Germany, buildings over 22 meters are prohibited from use. The system. Many insurance companies prohibit insurance for EPS-insulated buildings.

Fire is fiercer than tigers. Expert advice: The frequent fire wall insulation experience and foreign successful experience have shown that from now on, we should pass legislation, resolutely stop flammable external wall insulation materials, and vigorously promote inorganic insulation materials with good fire performance. Long-lived, recyclable, good fireproof and easy construction, moderately-priced external wall insulation materials allow residents to live more peace of mind!