Waterproof and breathable membranes are mainly applied to steel structures and wooden structures in the construction field. The domestic market is confusing. Most of the brands that are promoted through the Internet do not have the ability to produce waterproof and vapor-permeable membranes. Instead, they use non-woven fabrics and glue to simply combine counterfeits. Fake products. The following Xiaobian teaches us how to identify the construction of waterproof and breathable membranes and waterproof breathable membranes.

First, waterproof breathable membrane construction instructions

After choosing a good waterproof breathable membrane, it is time to start construction problems. 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.

Second, 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 capability The real waterproof breathable membrane is not compounded with glue, so the temperature resistance is -40,100 degrees (EU CE standards , US ASTM Standard). 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.

In recent years, the Chinese government has paid more and more attention to building energy conservation. With the continuous improvement of energy saving and environmental protection requirements, the waterproof and breathable membrane containment system has gradually been taken seriously by the industry.

The above is a brief introduction for Xiaobian. If you want to know more related information, please continue to pay attention to Qijia Consulting. More exciting consultation, please stay tuned.

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