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What is a window sill? Why is it important?
A window sill, also known as a window ledge or window bottom, is the shelf-like, flat piece of the window trim found at the base of the window. Window sills are important to the design and functionality of the window.
Sills serve a variety of purposes and functionality (2):
- Structural Integrity. The rigid sill on the bottom helps eliminate flexing to support the structure
- Improved Energy Efficiency. Provides barrier for thermal insulation to be installed
- Water Protection. Protects the wall and leads water away from the building when it rains and not into your home
- Decorative Space. Showcase plants, pictures, candles, etc.
Window sills are a necessity. Without the window sill, the window, wall and floors inside the home would all become water damaged. Window sills also play an important role in the functionality of the window. By providing a stopping place for the lower rail of the window, the sill effectively holds the sash in place when the window is closed.
Replacing a sill can be a DIY project for the right homeowner. It’s important to have the right tools on hand and to follow the proper procedures.
Window sills are angled because the angle directs rain away from the wall and building during periods of precipitation. If the sill was perfectly level, water would sit on the sill. This would cause the sill to rot quickly and would lead to leaks in the home.