People use terms “mullions” and “muntins” interchangeably. However these two window-related terms are actually quite different from each other, and knowing the differences can help you stay on the same page with a window replacement contractor. In today’s post, Masters Roofing takes a look at the differences between these two terms.
When building framing for exterior walls, home builders allow openings that are big enough to fit a single large window or a row of smaller windows. A homeowner may choose to change into one or the other at a later time without having to take out or change load-bearing components or structural supports.
Mullions are the vertical support components that separate multiple windows within the same opening. They’re not part of the window frame – instead, they act both as separator and structural support. If a homeowner decides to replace multiple windows with a large one, mullions will be removed prior to installation.
Muntins are also known as grilles. These narrow strips of wood, metal, or vinyl divide window glass into smaller sections or “lights”. Muntins are typically arranged as grids but may also be made into custom shapes, like in stained glass windows. Muntins are originally used to hold smaller panes of glass, as early glassmakers could not produce large ones as we know them today.
In comparison, modern muntins are more of a decorative component, as today’s windows are equipped with a single large glass panel set into the sash. Replacement window manufacturers add muntins that are removable for easy cleaning, with the option of having them on one or both sides of the window. Insulated windows may also have a between-the-glass option where the muntins are set between the interior and exterior glass panes, which gives it the additional function of structural support.
Masters Roofing provides window installation services to customers in Memphis, TN, and the surrounding communities. Give us a call at (901) 871-7663 or fill out our contact form to schedule an appointment.