The rainy season of the year is about to come, and the helplessness of the "10-room and nine-leakage" will be staged again. The "difficult" problem of building waterproofing has already plagued people for a long time. When the industry chaos can stop, the reporter recently learned that the abuse of inferior materials, Industry problems such as sub-layer subcontracting pressure have made waterproofing the weakest link in the construction project “Thousand Miles of Dykeâ€.
Inferior waterproof products rampage market
Since last year, the General Administration of Quality Supervision, Inspection and Quarantine has adopted building waterproof products as one of the 10 key products for quality improvement work. This year, it has listed building waterproofing membranes as one of the eight key quality improvement products. However, according to the results of the “three investigations†on the quality of national waterproofing membrane products in the past, some key and safety indicators still have major hidden dangers.
“In some areas, the market share of 'non-standard' waterproof products has reached 80%.†On April 10, Wang Xu, director of the Information Department of China Building Waterproof Association, said in an interview with this reporter that there is no “no†in the market. It is very common for securities companies to produce waterproof products and "certified enterprises to produce unlicensed products."
In recent years, we have organized reporters to conduct unannounced visits to waterproof materials in the market every year. Through the follow-up investigation on the waterproof building materials street of Wujia Village in Fengtai District, Beijing, the building materials wholesale market of Sihuiqiao and the building materials decoration market of Jiuxianqiao, although the country "Three orders and five applications", but "non-standard" and inferior waterproof products have been repeatedly prohibited. On April 10th, the reporter contacted several waterproof products companies under the name of “repairing waterproof materials for construction sites†and found that there are still many problems in the waterproof market this year. The same brand, the same specifications of waterproof products, the price of different businesses actually It can be two to three times worse, and the quality gap behind this disparity is also inevitable.
For the reason that "non-standard" waterproof products are popular, Wang Xu believes that this is directly related to the low concentration of the waterproof industry. According to the statistics of China Building Waterproof Association, in 2012, the total output value of the waterproofing industry exceeded 100 billion yuan, but there are only 10 enterprises with sales income exceeding 500 million yuan in the industry. The market share of the top 50 enterprises is less than the market. 20% of the total. “This is easy to lead to vicious competition in the industry. Direct performance is the proliferation of inferior products.â€
"Some companies are chasing profits and turning a blind eye to the standards." Wang Xu said that the "protocol products" that were originally higher in foreign countries because of special requirements have become chasing high profits in the country, while the prices are cheap and the standards are lowered. Inferior custom products. Even in areas such as Zhejiang, there have been “Oolong†incidents in which corporate standards are lower than national standards.
Redoing waterproof is equivalent to redoing roofing
“At present, only the products related to building safety are subject to production license management, and waterproof materials are one of them.†Wang Xu said that the impact of waterproofing on building safety is very important. However, with the decentralization of the management authority for production licenses, the number of manufacturers of waterproof materials has soared in recent years.
Wang Xu said that these enterprises have seen the market demand for waterproof and rapid growth swarming and preparing for “fishingâ€, including enterprises that make coils, paints, glues, dry powders, chemical products, and construction units. There are even unqualified “mud legsâ€. It is difficult for these “half-way†manufacturers to guarantee professional technical standards. The products they produce and related services are also uneven, so there is no guarantee.
Then, when these waterproof products with substandard quality are applied to construction projects, what are the hazards? Zhu Zhiyuan, a member of the Suzhou Waterproof Institute and a member of the Expert Committee, said that the role of waterproofing works in architecture is not just sensory. Waterproof, it also has a protective effect on the reinforced concrete structure of the main body of the building.
Zhu Zhiyuan said that if there is a problem in the waterproofing project, the steel structure in the main structure of the building will be corroded and charred, and the life of the construction project will be greatly shortened. The “non-standard†waterproof materials in the market are difficult to meet the 10-year service life in the technical requirements, which seriously restricts the life cycle of the building.
Shang Huasheng, director of the China Construction Waterproofing Industry Department, told the reporter that if there is a problem with the first waterproofing during the construction process, the insulation layer of the building will follow the problem, and the cost of the renovation is very large, which is equivalent to re-doing it once. Roofing.
Shang Huasheng gave the reporter an example of his own personal experience. “The asphalt grade composite material, which was originally at least 10 years old, was powdered in less than two years. This material was finally severely corroded like loess. Building safety poses a hidden danger and is also a waste of social resources."
How low the price is made by people
It is understood that in the industrial chain of construction industry, the waterproof industry is the bottommost end of the chain. "The professional waterproof market is extremely chaotic, and there are people who do low prices." According to Wang Xu, the waterproof material market is confusing, and it is impossible to attribute all responsibility to the production enterprises. Because through the sub-contracting price of the front section of the industry, to the waterproof part of the link, the remaining profits have been few, and often even the normal cost price can not be guaranteed, the company has no choice but to cut corners.
At present, the average cost of building waterproof engineering in the world accounts for about 8% of the total construction cost, but this data only accounts for 1% to 3% in China. Therefore, the construction waterproofing cost can only be operated at a low level for a long time. The difficulty can be imagined.
According to reports, the waterproof project usually adopts the “total package systemâ€, that is, the developer always packs the contractor to the civil construction unit, and then the general contractor unit subcontracts to the waterproof professional company. Ye Linbiao, deputy director of the China Architecture Society's Waterproof Technology Expert Committee, cited an example of a project that he participated in a national investment project. The waterproof project budget is 150 yuan per square meter. The money went to the place, first deducted 20% of the management fee, and sent it to the general contract at a price of 120 yuan per square meter, and the total package was finally sent to the construction party at a price of 60 yuan per square meter.
“When the mouth opens, the effect of the layers on the back layer is revealed.†Wang Xu said that the general contractor often does not have the qualification for waterproof construction, so the professional processes of waterproofing and decoration are subcontracted, and the price is lowered. To earn profits. Subcontracting companies often subcontract construction projects to other low-cost manufacturing enterprises, in order to divide the “one cupâ€, which directly leads to the application of the final inferior products in waterproof construction.
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