What is the correct tie spacing for an unsheeted scaffold, where not otherwise specified?

The correct tie spacing for an unsheeted scaffold is specified as every third bay, every second lift, and at the ends. This guideline ensures adequate stability and safety for the scaffold structure. Ties are crucial because they help to stabilize the scaffold against lateral forces such as wind and prevent it from tipping over or swaying during use.

In the case of unsheeted scaffolds, wind forces can exert significant pressure on the structure, and having appropriate tie spacing helps to distribute this load more effectively. By tying the scaffold at every third bay, it allows for a structural balance while ensuring that the ties are not spaced too far apart, which could compromise stability. Tying at every second lift means that the ties are distributed vertically as well, further enhancing stability.

The specification to tie at the ends also reinforces the structure's capacity to withstand forces acting on it from various angles, which is essential for safety during use.