How to ensure the waterproof performance of Shenyang glass curtain wall?

Ensuring the waterproof performance of Shenyang glass curtain walls requires starting from multiple aspects such as design, material selection, construction, and maintenance. The following are some specific methods:

In terms of design

Reasonable sealing design

Sealing glue design: Adopting multiple sealing glue designs, such as setting two layers of sealing glue inside and outside the opening fan and glass joint of the curtain wall to enhance the sealing effect. For example, silicone sealant with good weather resistance can be used as the outer sealant, which can effectively resist natural factors such as ultraviolet rays, wind and rain. Polyurethane sealant can be used as the inner sealant to assist in sealing and buffering.

Isobaric principle design: Using the isobaric principle, isobaric chambers are set up in certain parts of the curtain wall to make the pressure inside the chamber equal or close to the outdoor pressure, reducing the possibility of rainwater entering the room under the pressure difference. For example, pressure chambers can be set up between the secondary and main frames of the curtain wall, between the glass and aluminum frames, etc. By opening reasonable exhaust and drainage holes, the air inside the pressure chambers can be connected to the outdoor air, and the infiltrated rainwater can be discharged in a timely manner.

Optimize drainage system design

Setting up drainage channels: Smooth drainage channels should be set up at the bottom of the curtain wall, the connection between the curtain wall and the building body, and the corners of the curtain wall to timely discharge rainwater that seeps into the interior of the curtain wall. The size and slope of the drainage channel should be designed reasonably to ensure smooth drainage and avoid rainwater accumulation. For example, a drainage channel with a certain slope is set at the bottom of the curtain wall, and rainwater is discharged to the outdoor ground through drainage pipes.

Reasonable design of drainage holes: Based on factors such as the area, height, and local rainfall of the curtain wall, the size, location, and quantity of drainage holes should be reasonably set. Drainage holes should be located in areas where rainwater is prone to accumulate, such as under the beams of curtain walls, at glass joints, etc. At the same time, measures should be taken to prevent rainwater from flowing back, such as installing waterproof breathable membranes or anti backflow devices at drainage holes.

In terms of material selection

Choose high-quality sealant

Weather resistance: Choose sealant with good weather resistance, such as silicone sealant, which can resist the erosion of natural environments such as ultraviolet rays, ozone, and acid rain for a long time, maintaining good elasticity and sealing performance. Under the complex climate conditions in Shenyang, the service life of silicone sealant can reach more than 20 years.

Compatibility: Ensure good compatibility between the sealant and curtain wall materials such as glass, aluminum profiles, hardware, etc., to avoid a decrease in the performance of the sealant due to chemical reactions between materials. Compatibility tests should be conducted before use, and sealant products with good compatibility with curtain wall materials should be selected.

Using high-quality sealing strips

Material selection: Use high-quality sealing strips made of materials such as rubber and EPDM, which have good elasticity and aging resistance, and can maintain good sealing effect for a long time. For example, EPDM rubber sealing strips have excellent weather resistance, ozone resistance, and other properties, and can be used for a long time in the climate environment of Shenyang without aging or cracking.

Installation compression capacity: When installing the sealing strip, it is necessary to ensure that it has an appropriate compression capacity, generally 20% -30% of the diameter of the sealing strip, so that it can tightly fit between the curtain wall components and form an effective seal. Meanwhile, the length of the sealing strip should be slightly longer than the installation slot to ensure the compactness of the sealing strip after installation.

Construction aspect

Strictly control the construction of sealant

Base treatment: Before applying sealant, strict treatment must be carried out on the base to ensure that the surface of the base is clean, dry, smooth, and free of impurities such as dust, oil stains, and water stains. Thoroughly clean the oxide film on the surface of aluminum profiles and the stains on the glass surface to ensure the strong adhesion between the sealant and the substrate.

Sealing glue application: The sealing glue application should be uniform, continuous, and full, without defects such as bubbles or interruptions. After the application is completed, it should be promptly repaired to make the surface smooth, flat, and closely adhered to the surrounding materials. For some complex parts, such as corners, interfaces, etc., specialized tools should be used for fine processing to ensure sealing effectiveness.

Ensure the installation quality of the sealing strip

Accurate installation position: The installation position of the sealing strip should be accurate and meet the design requirements, without displacement or omission. During the installation process, it is necessary to follow the prescribed sequence, first installing the inner sealing strip, and then installing the outer sealing strip to ensure a tight fit between the sealing strips and form a complete sealing system.

Secure firmly: Use appropriate fixing methods to fix the sealing strip to the curtain wall components, such as using specialized glue, card slots, etc., to prevent the sealing strip from loosening or falling off during use. For some parts that are easily affected by wind pressure, it is necessary to increase the fixing points of sealing strips to improve their stability.

Maintenance aspect

Regularly check the sealant and sealing strip

Inspection cycle: Establish a reasonable inspection cycle, generally conducting a comprehensive inspection at least once a year, with a focus on checking the appearance of the sealant and sealing strip for cracks, aging, peeling, and other phenomena, as well as whether there is leakage in the sealing area.

Inspection method: Visual inspection, touch inspection, water injection test and other methods are used for inspection. For problems discovered, timely repair or replacement should be carried out to ensure the integrity of the sealing system.

Timely clean the drainage system

Cleaning frequency: According to the actual situation, regularly clean the drainage channels and holes of the curtain wall, generally at least once a quarter, to prevent debris from blocking the drainage channels and affecting the drainage effect.

Cleaning measures: During cleaning, tools such as high-pressure water guns, brushes, vacuum cleaners, etc. can be used to clean the dust, leaves, debris, etc. in the drainage channels and holes, ensuring smooth drainage.