Coastal and Floodplain Construction Inspector's Practice Exam

What characterizes a blocked diaphragm in light-framed construction?

1. Free-floating edges

2. All sheathing edges supported and fastened

3. A single layer of blocking

4. Panel edges unfastened

The correct answer is: All sheathing edges supported and fastened

In light-framed construction, a blocked diaphragm is characterized by all sheathing edges being supported and fastened. This ensures that the structural integrity and rigidity of the diaphragm are maintained. By fastening all edges, the diaphragm can effectively transfer loads, resist lateral forces, and provide stability to the overall structure. Properly supporting and fastening the edges also prevents movement and potential delamination, enhancing the performance of the structure during events such as wind or seismic activity. In contrast, free-floating edges would imply that the sheathing is not sufficiently anchored, which can compromise the diaphragm's ability to perform as intended. A single layer of blocking may not provide the necessary support across all sheathing edges that would be required for effective load transfer. Lastly, having panel edges unfastened would again undermine the diaphragm's structural function, leading to potential failure under stress.