What is the purpose of mullions in wall construction?

Mullions serve a crucial role in wall construction, particularly in the context of windows and doors by providing structural support. They are vertical or horizontal elements that divide a window or door into smaller sections or panels. This division not only enhances the aesthetic aspect by allowing for a more intricate design but also aids in distributing the structural loads from the building's façade to the surrounding framework. This ensures that the windows and doors maintain their integrity and alignment over time, resisting stresses from wind and other environmental factors.

Mullions are essential for preventing the sagging or bowing of large glass panes, which could compromise the performance and durability of the window or door assembly. By offering this support, mullions contribute to the overall structural stability of the wall system, allowing architects and engineers to design larger openings without sacrificing the strength of the building envelope.