What is considered the weakest area in a window?

The sash of a window is widely regarded as the weakest area because it is the component that holds the glass in place and typically features operable parts for opening and closing. While the frame provides structural support and the glass is designed to withstand various environmental stresses, the sash's construction often includes weaker materials and is specially designed for usability rather than security. This makes it more vulnerable to unauthorized access and damage.

In contrast, the frame is built to provide stability and strength, contributing to the overall integrity of the window unit. The glass, while fragile, is often treated or reinforced to enhance its durability. Caulking serves to seal the edges of the window, preventing air and water leaks, but does not play a direct role in preventing forced entry. Therefore, when assessing security and potential points of compromise in a window system, the sash's characteristics make it the most susceptible area.