Waterproof coating hidden mystery

The wall coverings have been damp and moldy. Some wall coverings have been eroded by water, falling downwards in blocks, and the cement wall is directly visible on the eroded wall. The waterproof material used many years ago has already expired 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.

According to a recent investigation and interview conducted by the reporter, there are multiple quality problems in the waterproofing industry, such as mixed material markets, and non-standard construction projects, which pose a huge hidden danger to the leakage of building materials.

The reporter visited the building hardware market paint hardware zone under the pretext of “waterproof for bathroom renovation”. There are about 30 to 40 merchants selling paint. Similar to what was known 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 businessman recommended three kinds of waterproof coatings to reporters: one is polyurethane waterproof coating, 20kg price is 300 yuan; one is acrylic waterproof coating, 20kg price is 230 yuan; there is a JS waterproof coating, 20kg price is 180 yuan. From the sample of the three coatings, their elasticity and flexibility feel different. One of the businesses told reporters that if large-scale use of waterproof coatings, it is best not to choose a brand we are familiar with, because this paint is selling well, the counterfeit goods on the market are also more, and it is easy to run into accidents. In addition, "SBS" waterproofing membranes sold on the market also have many 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 reporters that waterproof coatings currently do not have production license requirements, although environmental protection, standards and other requirements are more stringent, but compared with waterproof membranes, waterproof coating companies are smaller, more scattered It is even more uncontrolled and the market conditions are more chaotic.

The CECS 196:2006 "Technical Specification for Waterproofing of Building Interiors", which began in April 2006, specifies the waterproofing of bathrooms, kitchens and swimming pools. Waterproof materials required for use in architectural interior projects shall have product qualification certificates and factory inspection reports. The varieties, specifications, and performance of materials shall comply with the current national product standards and design requirements; the waterproof material package shall have obvious signs, and the content of the marks shall include the product name. , plant name address, lot number, shelf life and implementation standards.

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.

Around the Sihuiqiao building materials wholesale market, the reporter discovered that there are many workers who are branded “professional waterproof”. They usually take the initiative to negotiate with passers-by to ask if they want to do waterproof works. The reporter came up to one of them and talked with the other. When asked if he could do toilet waterproofing, the master from Henan promised, "Sure there is no problem." The price was around 300 yuan, when the reporter asked what brand of paint to use. When he made materials such as coils, he vowed to the reporter: "Be assured, you don't care about any material, just make sure that you don't leak water, and you'll have a free warranty afterwards." The reporter proposed to use a waterproof coating that is recognized by consumers as being of better quality. Master Zhang Lima changed his mind and said: "If we come to buy materials, the price is not 300 yuan, at least 800 yuan, because the kind of paint light to buy three or four hundred yuan, in addition to the money of the coil."

Master Zhang’s card to reporters shows that his company is a waterproof construction team approved by the Beijing Municipal Construction Committee. However, the reporter did not find the company’s relevant information in the Beijing Construction Committee’s official website.

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, told reporters that a major reason for the difficulty in controlling the quality of building waterproofing is subcontracting, and subcontracting can easily cause construction quality problems. In addition, some of the bids for waterproofing projects, in the tendering companies, many purchasers in order to save money, do not set a threshold, tend to adopt the "lowest bid" 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.