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Have you ever noticed the “X” mark on the glass window? Here’s the reason behind it

The ‘X’ mark on glass doors and windows in new buildings is a simple safety measure that makes transparent panels visible and helps prevent accidents during construction.

By Punam Chakraborty

Feb 28, 2026 17:42 IST

You might notice that when you enter a newly opened shop or any other place, such as an office or an apartment complex, everything seems neat, stylish, and transparent. Captivating light reflection and an airy feel are produced by glass panels. Even so, you could see an ordinary tape "X" positioned across specific windows or glass doors. You must be curious why that particular window has an "X" mark made with ordinary tape. What looks like an uncommon feature actually serves a very useful function throughout the building.

Here is the reason

Glass used in modern design is very transparent. It may seem like a wide road when viewed from a close distance. Workers travel efficiently across locations while concentrating on their job responsibilities on busy job sites. It might be difficult to determine whether a panel of glass has been installed in certain cases.

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Without any clear marks, someone may mistake the window for space and walk through it. Such incidents can sometimes cause injuries, and the glass may break. The taped "X" makes the panel easier to see. Places used for development are filled with activity. Ladders, iron rods, tools, and large materials are frequently carried by workers. A clear panel may be accidentally hit if it is not clearly visible.

The presence of a barrier is shown by the tape marking. It reduces the possibility of a crash and provides workers with a quick, visible alert. Both people and materials are protected by this simple technique.

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A temporary safety option

According to glass safety regulations, glass doors and panels must be readily identifiable in several countries. During construction, the taped "X" serves as a temporary solution.

Once the job is finished, it is taken off and replaced with durable markers like concealed labels or business logos.

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