In-depth Comparison: Curtain Walls and Window Walls

In-depth Comparison: Curtain Walls and Window Walls

Jan 10, 2024

Understanding the distinction between curtain walls and window walls is crucial for architects, builders, and property owners engaged in modern construction projects. Both systems offer unique benefits and characteristics that can significantly impact a building’s appearance, performance, and cost. This article provides an in-depth comparison of curtain wall and window wall systems, considering various factors like structural differences, thermal performance, aesthetics, installation, and cost.

Curtain Wall Systems

Curtain walls are non-load bearing façade systems that hang like a ‘curtain’ from the structure of a building. They are typically constructed with lightweight materials like glass and aluminium.

Structural Differences

Curtain walls are attached to the building’s structure but do not contribute to its stability. They span multiple floors and are designed to resist wind and seismic forces.

Thermal Performance

High-quality curtain walls offer excellent thermal insulation. They are often equipped with glazed panels that reduce heat transfer, enhancing the building’s energy efficiency.

Architectural Aesthetics

Curtain walls provide a sleek, modern look, often used in commercial and high-rise buildings. They allow for creative freedom with various finishes and transparency levels.

Window Wall Systems

Window walls, unlike curtain walls, are installed between the floor slabs of each level. They give the appearance of a continuous glass façade but are structurally different.

Structural Differences

Window walls are erected one story at a time and sit between concrete slabs. They support their weight and are sealed to the slab edges.

Thermal Performance

While window walls can offer good insulation, they may not perform as well as curtain walls in controlling heat and cold transfer due to the slab edges’ thermal bridging.

Architectural Aesthetics

Window walls can mimic the look of curtain walls but often have visible slab covers. They are more commonly used in residential buildings or low to mid-rise commercial structures.

Installation Process

The installation of curtain walls is a complex process that requires precise engineering and design. They are usually prefabricated and assembled on-site.

Window walls are less complex to install compared to curtain walls. Their installation is more straightforward since they are anchored directly to the floors.

Cost Comparison

Curtain walls tend to be more expensive than window walls due to the complexity of their design and their installation process. However, their long-term energy efficiency can offset the initial costs.

Window walls are generally more cost-effective, both in terms of materials and installation labour costs.


Choosing between a curtain wall and a window wall system depends on various factors, including the building’s height, aesthetic goals, budget, and thermal performance requirements. While curtain walls are ideal for high-rises, commercial buildings seeking a sleek, uninterrupted glass exterior and superior thermal performance, window walls are more suited for residential or low-rise buildings where cost-effectiveness and ease of installation are priorities.


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