North Carolina Building Contractor License Practice Exam

What is the recommended maximum protrusion for glass in doors?

1. 1 inch

2. 1/2 inch

3. 2 inches

4. 3 inches

The correct answer is: 1/2 inch

The recommended maximum protrusion for glass in doors is 1/2 inch. This standard is established for safety reasons, particularly to minimize the risk of injury to individuals who may accidentally come into contact with the glass. A protrusion that exceeds this measurement could significantly increase the likelihood of a glass-related injury—especially in high-traffic areas or residential settings where children may be present. Maintaining the maximum protrusion at 1/2 inch helps ensure that the glass is less of a hazard, allowing it to be flush with the surface of the door or, at the very least, minimizing how far it sticks out. This recommendation is also part of building codes and best practices in construction to enhance the overall safety and usability of doors. Adhering to this guideline helps builders and contractors create environments that prioritize safety while also ensuring compliance with local regulations.