Coastal and Floodplain Construction Inspector's Practice Exam

What is the maximum rafter overhang based on the rafter span?

1. Half the rafter span

2. One third the rafter span

3. Equal to the rafter span

4. Two feet

The correct answer is: One third the rafter span

The maximum rafter overhang is established based on the structural integrity and load distribution of the roof system. When the rafter span is taken into consideration, having an overhang that is one third of the rafter span ensures that the load from the roofing materials and any additional environmental loads are adequately supported without compromising the stability of the rafter structure. By limiting the overhang to one third of the rafter span, it minimizes the risk of excessive load on the rafters at their free ends, which could lead to issues such as sagging or potential failure of the rafters. This guideline is also consistent with building codes and best practices in roof construction, which aim to balance aesthetics with safety and functionality. The other options present overhang measurements that may exceed the structural limits and would not be advisable based on current construction practices. For example, an overhang equal to the rafter span or greater could significantly alter the load dynamics, leading to potential structural failure, especially under adverse weather conditions.