Coastal and Floodplain Construction Inspector's Practice Exam

What type of purlins should be used for rake overhang outlookers?

1. 2 X 6 purlins

2. Continuous 2 X 4 purlins

3. Single 2 X 4 purlins

4. 2 X 8 purlins

The correct answer is: Continuous 2 X 4 purlins

Using continuous 2 x 4 purlins for rake overhang outlookers is appropriate due to their structural properties that provide consistent support while minimizing the risk of sagging or deformation. Continuous purlins help distribute loads evenly across the length of the overhang, enhancing the stability and durability of the roofing system. This is particularly crucial in areas subject to wind uplift and other forces that can affect the integrity of the roof structure, especially in coastal and flood-prone regions. Other options, while potentially functional in certain contexts, do not offer the same level of continuous support. For instance, 2 x 6 or 2 x 8 purlins might be overly robust for this application, leading to unnecessary weight and potentially higher costs without significant benefits. Single purlins do not provide the needed continuity and support, making them less suitable for applications where consistent load distribution is crucial. The selection of continuous 2 x 4 purlins balances strength and practicality, ensuring proper performance for rake overhangs.