During exterior work, under what condition must you halt operations?

Halting operations during exterior work is crucial for maintaining safety and effectiveness in project execution. When wind exceeds 20 MPH or it begins to rain, these conditions can significantly affect both the safety of the workers and the quality of the work being performed. High winds can create risks for falling debris or equipment, while rain can pose dangers such as slippery surfaces and impaired visibility. Additionally, adverse weather can affect materials being used, particularly in construction or painting jobs, where moisture can compromise adhesion or lead to other issues.

These safety and quality concerns highlight why it's essential to stop work under these specific conditions. This approach not only protects the workers but also ensures that the overall integrity and outcomes of the project are maintained throughout the duration of the work.