Window grilles , often called security bars , have been used in various cultures for centuries. Their primary function has always been the same: to reinforce windows and protect buildings from intruders.
By adding a physical barrier, they make entry through the window—one of the most common entry points for burglars—much more difficult. However, over time, grille designs have evolved beyond simple vertical and horizontal lines. In many places, architects and homeowners began adding elegant curves. This raised a natural question:
Why do some window grilles have curves?
This brings us to the unique feature known as a belly .
The unique feature: What is a belly?
Not all roll bars are flat and rigid. Some roll bars have a rounded protrusion in the center section, giving them a fuller, more three-dimensional appearance.
This curve is not merely decorative. The design adds extra functionality, expands the usable space around the window, and offers flexibility in the use of the area, especially in urban environments where every inch counts.
Let’s delve deeper into the practical and aesthetic advantages.
