You've probably seen them: those elegant curved bars at the bottom of window grilles, especially on older buildings, historic homes, or certain architectural styles.
But they're not just decorative. They have a fascinating history and a practical purpose that dates back centuries.
Let's see why some window grilles are curved at the bottom… and what they're actually for.
🏠The practical explanation: keeping walls dry
The simplest reason is surprisingly straightforward: they help prevent water damage.
Before modern materials and sealants, rainwater ran down the panes and collected at the bottom edge. If the bars were straight and flush with the glass, the water could get trapped there, seep into the frame, and cause:
Wood rot
Mold
Structural damage
The curved design serves two purposes:
It diverts water away from the frame.
The curve acts like a small channel, directing water to the sides so it can drain safely.
It creates an air gap. By curving outward, the bar doesn't sit flush against the glass, allowing for air circulation and faster drying.
This simple solution protected wooden frames for centuries, long before modern waterproofing.
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