Understanding Window Placement: The Role of the Sill

In building construction, specific components are designed to support or frame openings like windows and doors. The question asks to identify the structural part, essentially a beam or horizontal member, on which windows are placed.

Architectural Components Explained

Let's look at the function of each option provided:

• Plinth: This is the base or foundation layer of a building that sits directly on the ground. It's typically the lowest part of the structure and is not directly involved in supporting a window.
• Lintel: A lintel is a horizontal structural element, often a beam (made of stone, wood, steel, or concrete), that spans the opening above a window or door. Its main purpose is to support the load of the wall above the opening.
• Sill: The sill is the bottommost horizontal member of a window or door frame. It forms the base of the window opening and provides a surface on which the window rests. It also helps to prevent drafts and water from entering the building.
• Chhajja: A chhajja, also known as a sunshade or overhang, is a projecting architectural element typically found above windows or doors. It's designed to provide shade from the sun and protection from rain.

Identifying the Correct Component

Based on the functions described above, the component that forms the base and supports the window is the sill. While a lintel supports the structure *above* the window, the sill supports the window unit itself from *below*.

Therefore, the beam or horizontal member on which windows are placed is the sill.