It’s not just aesthetic.
It’s smart engineering — a centuries-old solution to a very real problem.
Let’s explore why some window grills have a curve at the bottom — and why this small detail makes them stronger, safer, and smarter.
🔧 The Real Reason: Structural Strength Through Shape
The curved bottom on a window grill isn’t random.
It’s a reinforcement technique — based on the same principle that makes arches so strong in bridges and doorways.
When metal bars are curved:
When metal bars are curved:
They distribute weight and pressure more evenly
They resist bending and warping
They withstand force from multiple directions
A straight horizontal bar can sag over time — especially if it’s long or made of thinner metal.
But a curved bar?
It acts like a spring, absorbing stress and bouncing back.
