What is a framed-type glass curtain wall?

A framed-type glass curtain wall is a non-structural outer covering of a building where the exterior walls are made of large glass panels set within a metal framework. This type of curtain wall system is designed to protect the interior of the building from the elements (such as wind and rain) while allowing natural light to enter.

Key Features of a Framed-Type Glass Curtain Wall

Structural Support

- Metal Framework: The primary structural support comes from a metal frame, typically made of aluminum or steel. This frame is attached to the building's structural components, such as floors or columns.

- Glass Panels: Large glass panels are inserted into this metal framework. The glass is often double-glazed or laminated for added strength and insulation.

Non-Load Bearing

- Independent Structure: Unlike traditional walls, a framed-type glass curtain wall is non-load bearing. This means it does not carry any of the structural weight of the building. Instead, the weight is supported by the building's frame and foundations.

- Flexibility: Because the curtain wall is separate from the structural framework of the building, it can move independently. This allows it to better withstand forces such as wind pressure and seismic activity without transferring stress to the building’s structure.

Design and Aesthetics

- Modern Appearance: Glass curtain walls give buildings a sleek, modern look. They are often used in high-rise buildings and commercial structures for their aesthetic appeal.

- Transparency: They provide a high degree of transparency, allowing natural light to penetrate deep into the interior spaces, which can reduce the need for artificial lighting and improve energy efficiency.

Thermal and Acoustic Insulation

- Insulation: Modern framed-type glass curtain walls are designed to provide thermal insulation, helping to keep the building warm in the winter and cool in the summer. This is typically achieved through the use of double or triple glazing.

- Acoustic Control: These curtain wall systems also offer sound insulation, which is important in urban environments where noise pollution can be a concern.

Weather Protection

- Sealing: The joints between the glass panels and the frame are sealed to prevent water and air infiltration, ensuring that the interior of the building remains protected from the elements.

- Drainage: Many curtain wall systems include drainage systems to manage any water that penetrates the outer seals, preventing it from reaching the interior.

Types of Framed-Type Glass Curtain Walls

Stick System

- On-Site Assembly: The stick system involves assembling the curtain wall components (i.e., mullions and glass panels) on-site. This allows for flexibility and adjustments during installation but can be more time-consuming.

Unitized System

- Factory Assembly: In the unitized system, large units or modules of the curtain wall are pre-assembled in a factory. These units are then transported to the site and installed. This method is faster and often results in higher quality due to controlled factory conditions.

Applications

Framed-type glass curtain walls are commonly used in:

- Commercial Buildings: Such as office buildings, shopping malls, and hotels.

- High-Rise Buildings: Where they provide a striking appearance and enhance natural lighting.

- Institutional Buildings: Including hospitals, universities, and libraries, where aesthetic appeal and functionality are important.

Conclusion

A framed-type glass curtain wall is a versatile, aesthetically pleasing, and functional facade system used in modern architecture. It combines the transparency and lightness of glass with the strength and flexibility of a metal framework, offering numerous benefits in terms of design, insulation, and weather protection.