The wall coverings have been damp and moldy. Some wall coverings have been eroded by water, falling downwards in blocks, and the cement walls are directly visible on the eroded wall. Waterproof materials used many years ago have already failed, and the tiles on one wall have fallen off. Cracks have even appeared in the upper part of the wall, and newspapers have been stuffed in between.
Our recent investigation and interview found that there are multiple quality problems in the waterproof material industry, such as the mixed material market, and non-standard engineering construction, which pose a huge hidden danger to the leakage of water in buildings.
We visited the building hardware market paint hardware zone under the name 'Renovation of Bathroom Decorations' and there are about 30 to 40 merchants selling paints and coatings. Similar to what was learned in the Jiuxianqiao building materials decoration market, there are many kinds of waterproof materials. Take waterproof coatings as an example. From the viewpoint of names, there are waterproof coatings, waterproof pastes, and waterproof mortars. The same brand, the same specifications of waterproof coatings, different business prices can be as good as nearly 100 yuan.
A merchant recommended three kinds of waterproof coatings to us: one is a polyurethane waterproof coating, and the price of 20kg is 300 yuan; the one is acrylic waterproof coating, and the price of 20kg is 230 yuan; and the other is JS waterproof coating, and the price of 20kg is 180. yuan. From the sample of the three coatings, their elasticity and flexibility feel different. One of the merchants told us that if large-scale use of waterproof paint, it is best not to choose a brand we are familiar with, because the paint is selling well, there are many counterfeit goods on the market, accidentally, it is easy to run into. In addition, 'SBS' waterproof membranes sold on the market also have a lot of fakes.
According to the results of the AQSIQ's random inspection of the quality of construction waterproofing membrane products in recent years, the qualified rate of physical quality sampling of products was 94.6% in 2008, 85.7% in 2009 and 85.3% in 2010. Mainly manifested as soluble content, impermeability, tensile strength, elongation, etc. do not meet the requirements of the standard, and the product quality of waterproofing membranes is not optimistic.
A marketing director of a professional waterproof company told us that waterproof coatings currently have no requirements for production licenses. Although environmental protection, standards and other requirements are more stringent, compared with waterproofing materials, waterproof coating companies are smaller and more scattered. It is even more uncontrolled and the market conditions are more confusing.
In addition to the waterproof quality of the waterproof material, the waterproof construction personnel are not professional, and the construction quality is not up to the standard. This is also an important cause of water leakage.
In the vicinity of the Sihuiqiao building materials wholesale market, we discovered that there are many workers who are branded with 'professional waterproof'. They usually take the initiative to talk with passers-by and ask if they want to do waterproof works. We went up to talk with one of them. When asked if it was possible to do waterproofing in the bathroom, Master Zhang from Henan promised, 'There is definitely no problem.' 'The price is about 300 yuan. When we asked what brand of paint and coil materials to use, he vowed to tell us: 'Rest assured, you do not control any material, as long as you can ensure that you do not leak water, after the leak free warranty. 'We proposed to use a waterproof coating that consumers have recognized as being of better quality. Master Zhang Lima changed her mouth and said, 'If we come to buy materials, the price is not $300. At least 800 yuan is needed, because the kind of paint can be bought. Three or four hundred yuan, plus the money of the coil. '
The business card that Master Zhang left us shows that the company he belongs to is a waterproof construction team approved by the Beijing Municipal Construction Committee. However, we did not find out the relevant information of the company in the Beijing Municipal Construction Committee official website public inquiry.
Waterproof construction personnel need to have the appropriate qualifications? Construction specifications can be based on? Zhang Dingli, dean of the School of Civil Engineering and Architecture of Beijing Jiaotong University, said waterproof construction has a series of strict norms and standards. Taking large-scale construction projects as an example, before the waterproof construction of the bathroom, the “waterproof construction scheme for toilets†shall be formulated by the general contractor. After the supervision and approval of the toilet and the approval of the engineering department of the project company, the waterproof construction of the toilet may be carried out. The unit or subcontractor that undertakes the waterproof construction shall have corresponding waterproof professional construction qualifications. The construction personnel shall go through professional technical training and hold certificates. Firstly, the construction of the model was conducted. After Party A and the supervisor checked and passed the inspection, the construction could be fully carried out.
One Mr. Chen, who is engaged in architectural design in Shanghai, tells us that one of the reasons for the difficulty in controlling the quality of building waterproofing is subcontracting, and subcontracting easily creates problems with building quality. In addition, some bids for waterproofing projects, in the tendering companies, many purchasers in order to save expenses, do not set a threshold, tend to adopt the 'lowest bid winning' standard. After a successful low-price bid, in order to earn more profits, materials shoddy, and the production and sale of fake and shoddy products, it is easy to leave hidden dangers to the quality of the project.
Zhang Zixin, a professor in the Department of Underground Architecture and Engineering at Tongji University, said that waterproofing is a systematic project. There are various causes of water leakage. Building construction, construction, and later operation and management, and problems at any one stage, may cause leakage of water. Therefore, when doing waterproof engineering and waterproof maintenance, we must pay attention to the construction of the entire life span, the entire process of maintenance, pay attention to the integrity of the project, systemic.
The quality supervision department reminds consumers to purchase and use waterproof materials. First of all, they must pay attention to the instructions for use of the product, understand its use situation and application scope, and choose the right product for construction. Should not use rough packaging, container shape is skewed, use instructions and other characters printed fuzzy products. And try to go to the formal construction market or supermarket to buy.
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