Which of the following site conditions would require a special inspection?

High load diaphragms in wood frame construction necessitate special inspection due to the significant safety and structural implications involved. These diaphragms play a critical role in distributing loads throughout a structure and ensuring lateral stability. Given their importance, it is essential to verify that they are constructed according to the design specifications and applicable building codes, which often require a higher level of scrutiny during construction.

Special inspections are typically mandated for elements that involve unique engineering considerations or that are more prone to failure if not executed correctly. High load diaphragms fit this criterion, as they are integral to the structural integrity in areas subject to high winds or seismic activity. Inspections will ensure appropriate materials and structural connections are used and that construction techniques meet established standards.

In contrast, the other options—pavement conditions, landscaping features, and non-structural partitions—generally do not involve the same level of complexity or risk regarding structural safety and are often subjected to routine inspections instead of specialized inspections. Therefore, while all aspects of construction are important, high load diaphragms specifically require closer oversight to ensure overall building safety and performance.