What is the correct term for the bottom part of a window frame?

The bottom part of a window frame is referred to as the sill. The sill serves an important functional purpose; it helps to direct water away from the window structure, acting as a barrier against moisture that could lead to water damage or rot. It also provides a surface onto which window treatments might rest when closed and can serve as a place for decorative items or plants.

The term 'jamb' refers to the vertical sides of the window frame that support the window and provide stability and support to the entire structure. The 'head' is the top horizontal element of the window frame, contributing to the overall integrity of the window. The 'frame' generally encompasses all components of the window assembly, including the sill, jambs, and head. Understanding these specific terms is essential for carpentry and construction, as it ensures clear communication regarding window installation and maintenance.