"Foam" has become a hot spot in the thermal insulation building market.

The flammable exterior wall insulation is "popular"?

Since the fire in Shanghai in November last year, the fire protection of external wall thermal insulation materials has attracted widespread attention. This time, the Shenyang fire has still been burned from thermal insulation materials. So why is this flammable exterior wall insulation widely used?

According to the regulations of the Ministry of Construction, from 2001 onwards, it is necessary to build external wall insulation. Nanjing began in June 2005 and requires the construction of a new home must be built outside the wall insulation layer.

The reporter learned that there are two main external wall insulation materials on the Nanjing market, one is a foam board and the other is an extruded board. Both belong to a polystyrene foam, which is a kind of foam material. The insulation performance is very good, but they are all flammable. In addition, there is also a kind of glass fiber in the Nanjing market, which is a kind of heat-resistant insulation material that belongs to the flame retardant grade.

It is reported that the biggest difference between the combustible insulation layer and the flame retardant insulation layer is the price issue. Foam boards widely used in Nanjing, such as B2 (flammable), cost about 400 yuan per cubic meter; and B1 (non-flammable) cost 600 yuan per cubic meter. A residential community that uses B2 insulation is a couple of million dollars cheaper than using B1.

The Jiangsu Energy Conservation Acceptance Regulations stipulates that the selection of exterior wall thermal insulation materials for general buildings should be no less than Class B2—that is, the use of insulation materials such as B2 foam boards is in compliance with the regulations.

In fact, at present, not only Nanjing, most of the wall insulation materials throughout the country are mainly flammable polystyrene foam. However, in some developed countries, there are strict restrictions on the use of such flammable materials, but there are few regulations in the country.

Building energy-saving market "money" vast

According to the “Guidelines for GDP Energy Consumption by Provinces, Autonomous Regions and Municipalities directly under the Central Government” published by the National Bureau of Statistics and other agencies, the provinces (regions, cities) with the highest energy consumption are Ningxia, Guizhou, and Qinghai, respectively, and the energy consumption per unit of GDP is 4.14 (tons). Standard coal/ten thousand yuan, the same below), 3.25 and 3.07. In addition to the three provinces of Ningxia, Guizhou, and Qinghai, other provinces in western China such as Gansu, Inner Mongolia, Xinjiang, Yunnan, Shaanxi, and other energy-saving tasks are severe.

According to the latest data from the Energy Development Center of the National Development and Reform Commission, China’s energy consumption per unit of building area is generally 4-5 times that of developed countries and 2.5 times that of rooftops. Heating and air-conditioning load per unit of building area is 2-3 in developed countries. Around. According to the building energy conservation design standards promulgated by the Ministry of Construction, only 0.7% of the existing buildings can meet the building energy efficiency standards. During the “Eleventh Five-Year Plan” period, all kinds of new buildings in China must achieve energy conservation targets of 50% and 65%. According to Xu Zongwei, deputy director of the Department of Legal Affairs of the Ministry of Construction, 1/4 of the old buildings are required to carry out energy-saving renovations, and the transformation volume is 3.8 billion square meters. According to different building energy-saving standards in the north and south, preliminary calculations of only the national building energy-saving renovation project will mean a market of 2 trillion yuan.

Wu Chung, deputy director of the Department of Science and Technology of China’s Ministry of Construction, said that China’s promotion of building energy-saving technologies has brought new business opportunities to many companies. Building energy conservation is a long-term task in the industry chain. It is necessary to promote building energy conservation from the maintenance of structures, from materials to maintenance structures to systems, including walls, thermal insulation materials, doors and windows, and smart material systems. At the same time, he pointed out that as an important part of promoting renewable resources as an energy security strategy, construction is an important application link for renewable energy, and the building energy-saving industrial chain will bring development opportunities for many companies.