Alabama Contractors License Practice Exam

Framing members for each individual pane of glass must have a deflection of less than ____ of the glass edge length.

1. (1/100)

2. (1/150)

3. (1/175)

4. (1/200)

The correct answer is: (1/175)

The specific requirement for the deflection of framing members for individual panes of glass is typically aimed at ensuring structural stability and minimizing the risk of cracking or breaking due to excessive movement. In this case, a deflection limit of less than 1/175 of the glass edge length is generally accepted for framing members supporting glass. This limit helps to reduce stress on the glass caused by load and environmental factors such as wind, thermal movements, and vibrations. When achieving a deflection limit of 1/175, it ensures that the framing structure will remain stable under various conditions, thus preserving the integrity of the glass and extending its lifespan. The other options provide different deflection ratios, which may offer varying degrees of safety and performance. However, the 1/175 ratio is notably conservative and aligns with industry standards, which aim to protect the glass installation from undue stress while allowing for a reasonable amount of deflection that still ensures safety and durability.