A windowsill, also called a window ledge or window bottom, is the horizontal shelf-like part of the window frame at its base. While the term is often used for the interior surface, it refers to both the inside and outside components, which serve different purposes.
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- Water protection: The exterior sill is typically angled downward to direct rainwater away from the walls and foundation, preventing leaks and moisture damage like rot and mold.
- Structural support: As a rigid base, the sill provides structural integrity to the window, preventing it from shifting as the building settles.
- Energy efficiency: A properly installed sill creates an airtight seal that helps insulate the window, reducing drafts and heat loss.
- Decorative space: The interior sill, technically known as a "window stool," is a flat surface that can be used to display plants, books, photos, and other decorative items.
