The height to base ratio of scaffolding shall not be more than _____.

The height to base ratio of scaffolding is crucial for ensuring the stability and safety of the scaffolding structure. A ratio of 4:1 indicates that for every four units of height, there should be one unit of base width. This ensures that the scaffolding is sufficiently stable to support the workers and materials on it, minimizing the risk of tipping or collapse.

The choice of a 4:1 ratio has been established in safety regulations and guidelines, as it provides a margin of safety that allows for various field conditions and the potential for forces acting on the scaffolding, such as wind or movement from workers. This ratio balances the need for height in scaffolding for reaching higher work areas while maintaining a secure and stable base.

In contrast, lower ratios like 1:1, 2:1, or 3:1 do not provide the same level of stability and can increase the risk of accidents in a work environment, where scaffolding is often subjected to dynamic loads and external conditions. Thus, adhering to a 4:1 height to base ratio is essential for safety in construction and maintenance work.