Red Seal Glazier Practice Exam

What is the typical maximum allowable deflection for a glass panel?

1. 1/50 of the span length

2. 1/100 of the span length

3. 1/175 of the span length

4. 1/200 of the span length

The correct answer is: 1/175 of the span length

The typical maximum allowable deflection for a glass panel is based on engineering standards that ensure both safety and aesthetic quality. Deflection refers to the amount a glass panel bends or sags when subjected to load. For glass panels, an allowance of 1/175 of the span length is commonly accepted in the industry. This specification is designed to minimize the risk of glass breakage due to excessive bending while also preventing visible distortion that could affect the appearance or functionality of the panel. This benchmark addresses the balance between structural integrity and visual impact. If the deflection exceeds this limit, it can lead to problems such as cracking or permanent deformation, which compromise safety and performance. Thus, it's crucial for glaziers to follow this guideline to ensure the glass panels maintain both strength and aesthetic quality over time.