Anchorages act as an independent structure that attach to a building structure and the worker ties off to the device.
An anchor point needs to be fixed to a structural surface, which has to be strong enough to hold the sudden weight and force of a falling worker. Anchors can be removed or left in place for future use.
The anchor acts as a temporary or permanent system, but it creates a hole in the roof substrate.
A metal or steel anchor is the most common method for the anchorage component, but many rooftops and surface don’t allow penetration of the roof membrane.
The demand for a completely temporary anchorage system led to the development of mobile fall arrest.