A component utilized to create an airtight and watertight barrier between a window and its frame is an essential element in building construction. It prevents the infiltration of air, water, and insects, maintaining a comfortable indoor environment. An example includes the flexible material surrounding the glass pane of a double-hung window, visible when the window is closed.
The presence of such barriers is crucial for energy efficiency by minimizing heat loss in the winter and heat gain in the summer. This contributes to reduced energy consumption and lower utility bills. Historically, materials like putty and caulk were used; however, modern solutions often employ more durable and effective materials such as silicone, rubber, or foam.