Before hanging something on a roof or wall, what should you do?

Before hanging something on a roof or wall, looking behind is crucial because it ensures safety by checking for any hidden electrical lines, plumbing pipes, or structural elements that could be damaged or pose a risk during the hanging process. This step is essential to avoid accidents or costly repairs that can arise from unexpected obstacles.

Additionally, ensuring that you are aware of the surroundings and potential hazards contributes to a safer working environment. While other actions, such as checking the weather or measuring height, can be important in certain scenarios, they do not address the immediate safety and potential damage issues that could arise from what is located behind the wall or roof surface. Thus, confirming that the area behind the surface is clear is the most critical step before proceeding with any hanging task.