mullions

Wed, 06 May 2026 18:00:34 +0000

Understanding Mullions: The Architectural Support System in Windows, Doors, and Façades When it comes to architectural design and structural integrity, mullions play a vital yet often overlooked role. These vertical structural elements divide windows, doors, or light wells, offering both aesthetic appeal and essential load-bearing support. Whether you're designing a modern home, a commercial building, or restoring historic architecture, understanding mullions is key to creating visually impressive and structurally sound spaces. ### What Are Mullions? Mullions are vertical elements that separate multiple panes of glass in windows, doors, or claddings. Traditionally crafted from wood, metal, or reinforced materials, mullions serve dual purposes: improving visual symmetry and strengthening structural performance. In building design, mullions are commonly found between stacked windows in a row, or as emerging features in glass wall systems and curtain walls.