Mullion
A vertical or horizontal element that forms a division between units of a window, door, or screen, often providing structural support.
A mullion is a vertical or horizontal structural element that divides adjacent window units or panels, providing support and design flexibility. It is crucial for optimizing aesthetics, enhancing structural performance, and supporting window or facade design. By providing a reliable and effective support solution, mullions support efficient construction, improve window performance, and contribute to successful project delivery by ensuring that facades are well-designed, aligned with design specifications, and capable of meeting performance criteria and client expectations.
Used in a sentence
Mullions were installed between the window panes for added support.
Synonyms/variation
Window Divider
Stay updated on what’s happening in construction.
Subscribe to Blueprint, Procore’s free construction newsletter, to get content from industry experts delivered straight to your inbox.
Learn MoreLearn more about Mullion
How can we improve this glossary entry?
By clicking this button, you agree to our Privacy Notice and Terms of Service.



