Waterproof materials Qualification and pricing and some work guidelines
1. Leak-stopping and water-stopping materials
Leak-stopping and water-stopping materials can be divided into high-efficiency Waterproof leak-proofing materials and commonly used chemical grouting leak-proofing materials.
1.1 High-efficiency waterproof and leak-proof material
It is a hydraulic inorganic cementitious material that has waterproof and anti-seepage properties after being mixed with water and hardened. This material generally appears as a white or gray powdery material. Its characteristics and functions are: non-toxic, tasteless, and does not pollute the environment. It is resistant to aging, easy to construct, can be constructed on wet base surfaces, and has the effect of immediately stopping leakage. It has strong bonding force and can be firmly combined with bricks, stone concrete, cement mortar, etc. to form a whole.
2.2 Commonly used chemical grouting plugging materials
Commonly used chemical grouting materials are classified according to their materials, including acrylamide, epoxy resin, methacrylate, polyurethane, etc. , these materials have certain unique properties and are highly targeted when used. They are generally used in special projects.
3. Identification of waterproofing membrane quality
First of all, large and powerful companies are generally very Pay attention to product quality, packaging, use and after-sales service, so that even if there are problems during use, you can get timely feedback and solutions from the manufacturer. Larger waterproofing membrane companies include Dongfang Yuhong in Beijing, Golden Thumb in Henan, Golden Umbrella in Guangxi, Tongyuan in Hunan, and Blue Shield Star in Hubei, etc.
The second is to look at the quality. There are some tips that can be used when selecting on site:
1. Appearance marking inspection: look at the model, manufacturer, address, certificate, and production license number. , implementation standards, negative temperature marking, etc.;
2. Appearance identification:
a. Check the entire roll for cracks with a length of more than 10mm;
b. Generally, unroll the entire roll of roll material at a high temperature of 30 degrees in summer to see if bonding occurs;
c. Check whether the tire base is completely soaked: no matter what type of roll it is, As long as there is a tire base, whether the tire base is soaked or not is related to the waterproof performance and durability of the entire membrane. The method is very simple. Use a knife to cut a small piece of membrane and look at the middle part. If it is completely black, it is well soaked. If If there are white or gray stripes and spots, the tire base is not completely soaked, and the coil is unqualified;
3. Performance identification method:
a. Look at the flexibility, the coil is flexible in winter Whether the membrane is good or not depends on whether it is easy to construct. Fold the waterproof membrane 180 degrees by hand to see if there are cracks or breaks on the upper and lower sides. If there are any, the membrane is unqualified;
b. Look at the pull Stretch, the intuitive feeling of a good waterproof membrane should be hard and tough, that is, the membrane should have a certain hardness and a certain elasticity when pressed with your hands. Specifically, tear off the isolation film of the membrane and pinch it with your fingertips. Hold the asphalt surface of the waterproof membrane and stretch it to see its stretchability. If it falls off when pinched, the membrane has insufficient cohesion. At the same time, the membrane should not be torn apart when you tear it hard with your hands. Otherwise, it means that the effective material in the membrane is elastomer. If there is less, the coil material will not have enough toughness and poor tensile strength.
c. Looking at high temperature resistance, high-quality waterproof membranes, whether in summer or winter, the asphalt coating will not slip, flow, or fall after construction. Among them, self-adhesive membranes The isolation membrane can not only adhere well to the asphalt layer, but also peel off as a whole without effort or tearing. The elastomer-modified asphalt membrane should not stick together or appear at the corners. Overflow phenomenon, otherwise it will be deemed unqualified.
There are many types of waterproof coatings, but they all have one thing in common. When using or testing, there are 5 indicators: Critical. The five main quality indicators of waterproof coatings are as follows:
1. Solid content:
The main film-forming substances of waterproof coatings. According to the characteristics of various waterproof coatings, various types of waterproof coatings are proposed. Solids content requirements for coatings. If the solid content is too low, the quality of the coating film cannot be guaranteed.
2. Heat resistance:
Under high temperature conditions, the temperature of the roof surface can reach 70 degrees Celsius. If the heat resistance of the coating is less than 80 degrees Celsius and cannot be maintained for 5 hours, the coating film will flow, bubble and slide.
3. Low-temperature flexibility:
Waterproof coatings have certain adaptability to construction temperatures. According to the characteristics of various waterproof coatings, the low-temperature flexibility requirements of various waterproof coatings are proposed.
4. Extensibility:
Various waterproof coatings have a certain ability to adapt to the deformation of the base layer to ensure the waterproof effect. According to the characteristics of various waterproof coatings, the extensibility requirements of various waterproof coatings are proposed.
5. Water impermeability:
According to the characteristics of various waterproof coatings, the water impermeability requirements of various waterproof coatings are proposed. If the proposed quality requirements can be met, there will be no direct leakage in the completed waterproofing layer.
1. The cost of waterproofing membrane is generally between 20-40 yuan/square meter. Such as SBS, APP type I modified asphalt waterproofing membrane.The material cost is: 26~30 yuan/square meter. The cost of type II modified asphalt waterproofing membrane is: 32 to 36 yuan/square meter.
2. Polyethylene and polypropylene waterproof membranes are mainly classified according to their weight per square meter. The material cost of one-time molded polyethylene polypropylene waterproofing membrane that can meet national standards is generally more than 28 yuan/square meter.
3. Acrylic and polyurethane waterproof coatings: Acrylic is an early waterproof material used in environmentally friendly paints and coatings. The cost is about 28 to 32 yuan/square meter. Polyurethane waterproofing In the past, it was the main force in the waterproof market and its waterproof performance was still good. Because the solid content, impermeability and other indicators were better than acrylic, its cost was correspondingly above 35 yuan/square meter.
4. Polymer cement-based waterproof coating: Polymer cement-based has become the protagonist of the waterproof coating market. Currently, cement mortar is one of the emerging waterproof materials, and the construction cost is about 20 to 24 yuan/square meter. .
5. The price of waterproof materials is also related to product specifications and performance. For example, Xiangyuan brand polyethylene polyester waterproof and moisture-proof material, water impermeability: 30min, material: polyester, bending strength: -20℃, tensile strength: ≥80%, tear strength: 20n, core material: polyester, shape : Layered, shape: rolled plate, price: 0.6 mm 2.5 yuan; 0.8 mm 3.5 yuan; 1.0 mm 4.5 yuan.
Due to the wide variety of waterproof materials with different specifications and uneven quality, and the pricing of each manufacturer is different, you need to inquire with the manufacturer for specific prices.
