All work on roofs or at significant heights can be hazardous, regardless of whether the task is expected to take only a short time.
In all cases, it is essential to consider all safety measures to control and minimise risk, and proper preparation of the work is important.
When working at height, factors such as weather conditions can greatly influence the level of risk involved in the task.

On the AOSH website you can find examples of risk assessments, equipment, fall protection and other important considerations when working at height.