When accessing roofs, which building feature affects the requirement for access?

The requirement for access to roofs is primarily influenced by the number of storeys in the building and its slope. A building's height, determined by the number of storeys, dictates the safety measures required for accessing the roof. This is because as buildings become taller, the risks associated with maintaining or inspecting the roof increase, necessitating more stringent access requirements to ensure the safety of personnel.

Additionally, the slope of the roof can affect how personnel can safely access it. A steeply sloped roof may require different access methods or more safety equipment compared to a flat roof. This combination of the building's height and roof slope is critical in establishing the access requirements based on codes and regulations designed to protect workers and ensure safe practices.

In contrast, while factors like the type of material used for the roof, roof height alone, or the surrounding landscaping can influence design considerations, they do not directly govern the access requirements in the same way that the building's height and roof slope do. Access provisions are largely determined by potential hazards associated with working at heights and the structural design of the building.