As a homeowner, you may have heard of or are familiar with the term “window mulling.” This is basically a process of joining two or more windows together. The windows have to be of the same kind in order to be joined together. This creates a more solid and weather-resistant window, as well as a modern and clean design. This process can be applied to nearly all kinds of windows. There are a number of other advantages to this process, as well as a few things to consider. So, whether you have a wood, composite, or fiberglass window, here’s what you need to know about window mulling.