The quality of the web is uneven
Li Laiquan told reporters that the market for waterproof materials is currently chaotic and fake and shoddy products are rampant. Some unscrupulous manufacturers specialize in the production of a number of 'boutiques' for spot inspections and inspections. Although they hold qualified inspection reports, they produce unqualified products, and they use brand names. The dumplings made false propaganda and promoted shoddy products; some of them pilfered the column during the construction process, and were submitted to the site for inspection as qualified products. Actual construction was replaced with inferior products.
According to statistics, in recent years, the proportion of new types of new waterproof materials in the country has increased by 7 to 8 percentage points, which is close to 40%. However, the basic situation of the waterproof material market is still in a good and bad situation, counterfeit and shoddy products continue to prohibit the situation. Fake and inferior products are dumped at a price 60% lower than that of the regular products, and the market share is so large that the formal large and medium-sized enterprises are unsustainable. The new SBS modified bitumen waterproofing membranes are the hardest hit. Domestic well-known waterproof companies have lost their market share at the expense of the market because they insist on product quality.
System Engineering Vulnerabilities
Regarding the causes of leakage in construction projects, Li Laiquan pointed out that although the lack of material quality assurance is one of the causes of leakage, the lack of assurance that the design is inconsistent with the relevant national standards and the quality of construction is also the main reason for leakage.
Waterproof design is weak. The material selection of the waterproof layer should be carried out by the designer strictly in accordance with the requirements of the “Code.†However, many designers, especially young designers, are not familiar with the performance of waterproof materials, and their understanding of the waterproof concept is weak, and they are vulnerable to some falsehoods. Propaganda was misled, deceived, and unconsciously chose shoddy products. Even some designers have been interfered with by too many developers, and eventually gave up their own positions and responsibilities, this will give the selection of the most critical link to the construction unit to decide. For subcontracted construction projects, each floor must pursue its own interests. Most of them agree with the quality of sacrificial materials, use inferior products, and purchase at low prices. Designers can only ignore them.
The construction quality is even more worrying. The proliferation of fake and shoddy waterproof materials, followed by the pressure of waterproof construction projects is very low, so that the formal waterproof construction company is difficult to win the bid, forcing the project to fall into the hands of some unqualified, affiliated low-quality contract team. The construction workers in these contract teams did not have professional training because of the lack of relevant vocational skills certification systems and skills tests. The levels were uneven. Secondly, for the sake of their own interests, the winning bid construction team has to cut corners, cut corners, and perform rough work.
Standard lag urgent adjustment
All along, the standard lag is one of the main factors hindering the healthy development of the waterproofing industry. 'Now the state requires that all elastomer modified bituminous waterproofing membranes meet this requirement. Actually, the national regulations do not involve the construction site. 'Lee said all. At present, the main technical indicator for the implementation of elastomer modified bitumen membrane is "GBl8242-2008", and its low temperature flexibility must reach -25°C to -20°C without any cracks. Its heat resistance is at 90°C. No sliding or dropping at 105°C. However, the temperature difference in China is segmental, and the temperature in different regions is very different. The requirements for coiled materials should also be different. Li Laiquan analyzed from the actual case that Guangzhou is located in the north temperate zone and the tropical transition zone. The average temperature of the hottest month (July) is 28.5°C, and the average temperature of the coldest month (January) is 13.3°C. It is the smallest city in China with the smallest annual average temperature difference. First, if it is necessary to use a modified bitumen membrane with a low temperature flexibility of -20°C, it is actually a waste of resources. Because of the technical requirements of materials, the higher the energy consumption, the higher the cost. At the same time, Li Laiquan stated that some of the published standards obviously lag behind the development of the waterproofing industry, but they have not been revised and improved in a timely manner. National standards are an important basis for determining whether products are qualified or not, and they are also an important guarantee for promoting the development of the industry, but At present, the national standards are lagging behind and are urgently needed to be resolved.
Li Laiquan introduced that not long ago, the China Construction Waterproofing Association issued a document to the National Industrial Product Production Licensing Office, recommending that the “Implementation Rules for Building Waterproof Coil Products Production Licenses†(2009 version) should be revised according to the actual situation and development trend of the building waterproofing industry. Part of the content is to facilitate the implementation of the new waterproofing policy of the "Guided Catalogue for the Elimination of Backward Production Process Equipment and Products (2010 Edition) for some industrial sectors". The association believes that the "Detailed Rules" should be modified with reference to the four key indicators for the production line of waterproofing membranes with an annual output of 5 million square meters and above. The association stated that implementing the "Announcement" and amending the "Detailed Rules" will better implement the national industrial policy and promote the building waterproofing industry to a new level.
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