Water-proof breathable membrane (abbreviated as Teflon or [PTFE, F4]), is known as/commonly known as "Plastic King", Chinese brand name "Teflon", "Teflon", "Teflon", "Teflon", "Teflon" and so on. It is a polymer compound made of tetrafluoroethylene polymerized and has excellent chemical stability and corrosion resistance (it is one of the best materials for corrosion resistance in the world today. An important method to solve the problem of waterproofing is to lay a gas-proof membrane. A good waterproof breathable membrane can ensure that our living environment will not be plagued by “water leakage.†I believe that everyone is not very understanding of the construction of waterproof breathable membrane . Then how to lay a waterproof breathable membrane? Let me tell everyone waterproof Breathable membrane construction related knowledge.
Waterproof breathable membrane principle
In the state of water vapor, the water particles are very small, and according to the principle of capillary motion, they can penetrate the capillary smoothly to the other side (in our products, they can smoothly pass through the middle plastic layer), so that the phenomenon of vapor transmission occurs. When water vapour condenses into water droplets, the particles become larger. Due to the surface tension of the water droplets (water molecules “pull and pull†against each other), water molecules cannot smoothly separate from the water droplets and penetrate to the other side. Water infiltration occurs and the vapor-permeable membrane has a waterproof function.
Waterproof breathable membrane material
The technology of waterproof and breathable membranes was first introduced from Europe and the United States. However, the production technology of domestic products was varied, and the quality of products from various manufacturers was uneven, failing to form a unified quality standard. In fact, waterproof breathable membranes are mainly composed of three layers: PP spunbond nonwovens, PE polymer breathable membranes, PP spunbond nonwovens. The role of spunbonded non-woven fabrics is mainly to enhance tensile and hydrostatic pressure and protect the middle layer (breathable film). The real breathability is mainly based on the middle layer PE polymer breathable film.
Waterproof breathable film price
The price of waterproof breathable membranes consists mainly of raw materials, production processes, and equipment investment costs. At present, some domestic manufacturers spread waterproof breathable membranes that are auxiliary materials, the cost is very low, the price is low, not higher than the main material such as insulation cotton. This is nonsense. This kind of speech is purely to harm consumers and mislead consumers. Because these manufacturers do not master the production process of waterproof breathable membranes, they use very simple laminating non-woven membrane or hot melt adhesive spray adhesive composite non-woven equipment to produce counterfeit waterproof breathable membranes to mislead consumers To achieve ulterior motives.
How to identify genuine waterproof breathable membrane
1. Laboratory testing
Test items: a. Temperature resistance b. Water vapor transmission capacity (ie, air permeability) c. Hydrostatic pressure d. Anti-aging ability
The real waterproof breathable film is not compounded with glue, so the temperature resistance is -40,100 degrees (EU CE standards, the United States ASTM standards). It is also not made of polyethylene or TPO lamination film, so the air permeability should be more than 1500g/sq./24h, and it is basically impermeable to air with polyethylene or TPO lamination. Hydrostatic pressure testing, thin waterproof breathable membrane hydrostatic pressure of at least 1.5 meters, thick waterproof breathable membrane at least 2 meters. Anti-aging is a must because PP materials are prone to ageing under UV light. Some counterfeit waterproof breathable membranes are produced from poorly recycled materials. This waterproof breathable membrane is easily degraded during construction.
2. Simple hands-on detection
On the surface, there are obvious pressure points on both sides of the waterproof breathable film. That is because the production process is compounded by hot pressing. Please note that not the dot pattern of the non-woven fabric itself but the obvious overlapping pattern. To tear open the waterproof breathable film, first of all, the middle layer of polymer layer should be a milky, very soft layer of waterproof breathable layer, because it is composited by hot pressing, this film should have a pressure point above it. In addition, the light pressure of non-woven fabrics and membranes, if there is a sticky feel, it can be concluded that this is hot melt adhesive, then this is counterfeit waterproof breathable membrane. Because the hot melt adhesive adheres even at room temperature, the three-layer material will quickly foam and delaminate.
Waterproof breathable film manufacturers
Shenzhen Nantong Kangda Composite Material Co., Ltd.
Kedebao Building Energy Saving Technology Co., Ltd.
Waterproof breathable membrane construction
After selecting a good waterproof breathable membrane, it is necessary to start construction of the waterproof breathable membrane. During the construction process, penetration and opening on the waterproof breathable membrane should be avoided as much as possible to ensure the integrity of the waterproof breathable membrane. If penetration or penetration is necessary, the penetration and opening are sealed with butyl tape.
Since the waterproof breathable membrane has no obvious flame retardant effect, welding of connection parts for curtain wall projects should be avoided as much as possible. The open flame operation (including welding) should be arranged before the construction of the waterproof and breathable membrane. It is forbidden to conduct open flame operations near the waterproof and breathable membrane (including electric welding construction. ).
In the laying of waterproof breathable membranes, according to the actual situation, choose the laying method, the waterproof breathable membrane and insulation wool with rock wool nails, fixed rock wool nails with butyl tape seal, seal area size to butyl tape will The nail head completely covers the standard.
Before the construction, clean the dust and oil on the corners to ensure that the corners are clean to ensure the bonding of the corners and the waterproof and breathable membrane. Corners through the waterproof breathable membrane should be as far as possible to ensure the integrity of the waterproof breathable membrane, waterproof breathable membrane curve flooding the corners of the code and the waterproof breathable membrane completely sealed. The seal is not less than 2cm thick with corners.
The waterproof breathable membrane is overlapped with the window frame and the door frame, and the waterproof breathable membrane is applied with a straight water-flooding seal, and a water-proof breathable membrane curve is used to flood the corner. The width of the seal between the seal and the window frame and door frame shall not be less than 2cm, and the adhesive width at the corner shall not be less than 10cm. The installation sequence is: the lower part of the door window frame → the lower corner of the door window frame → the side frame of the door window frame → the upper corner of the door window frame → the upper part of the door window frame → the seal.
During roof construction, the waterproof breathable membrane shall be laid along the straight direction of the roof, and the overlap length shall be 10cm. When the high-strength aluminum alloy bracket of the roof passes through the waterproof breathable membrane, the junction of the aluminum alloy bracket and the waterproof breathable membrane is used. Base tape is sealed around it. In addition, waterproof breathable membranes should not be exposed to ultraviolet light for long periods of time, and exterior finishes should be completed as soon as possible.
Editor's summary: The above is the waterproof breathable membrane construction process how to identify the true knowledge of the waterproof breathable membrane related knowledge, the current waterproof breathable membrane is widely used in construction. We can judge the quality of the breathable film by tearing the breathable film and observing the condition of each layer. The house with a waterproof breathable membrane is like a raincoat on the outside of the house. In the rainy days, we will never worry about the problem of "water leakage."
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