Semi-Unitized Glazing System

A semi-unitized curtain wall glazing system is a type of structural glazing where the primary structural framing components are erected individually as an erector set. In this set, the vertical mullions are attached first to the floor slabs and the horizontals are attached to the vertical mullions to resemble a grid.

Semi-Unitized Glazing System

A semi-unitized curtain wall glazing system is a modern façade solution that blends on-site structural assembly with factory-finished glazing components. This system is commonly used in contemporary buildings where efficiency, durability, and architectural precision are key requirements. In this glazing method, the main structural framework is installed at the project site in a systematic sequence. The process begins with fixing the vertical mullions directly to the floor slabs, creating the primary load-bearing support. Once the vertical members are aligned and secured, horizontal mullions are connected, forming a rigid and uniform grid structure across the building façade.

Semi Unitized Façade System

Unlike fully site-glazed systems, the glass panels and spandrel units—which may be manufactured using glass or aluminium—are pre-assembled under controlled factory conditions. This approach ensures higher quality standards, consistent finishes, and reduced chances of installation errors. These pre-glazed units are then transported to the site and carefully fitted into the already assembled mullion framework.

Final installation activities, such as joint alignment, perimeter sealing, and weatherproofing, are carried out on site to ensure long-term protection against air and water infiltration. The system is generally anchored to the slab edge or slab face using embedded inserts or plates, allowing effective load transfer and structural stability.

Semi-unitized curtain wall systems offer numerous benefits, including quicker installation, improved construction accuracy, enhanced façade performance, and design flexibility. They are especially suitable for commercial buildings, high-rise structures, IT parks, and institutional projects where modern appearance and performance reliability are essential. Overall, the semi-unitized glazing system delivers an ideal balance between speed, quality, and structural efficiency, making it a preferred choice for today’s architectural and construction needs.

Advantages of Semi-Unitized Glazing

The vertical mullions in most semi-unitized glazing systems can span two floors with ease and as a result, provide greater structural efficiency.
Most semi-unitized glazing systems have shop-assembled or off-site assembled frames. This reduces the time and cost.