The ‌3 to 1 rule‌ is a critical safety principle in scaffolding construction, defined as follows:

‌Core Requirement‌
For freestanding scaffolds, the minimum base width must be ‌at least one-third (1/3) of the total height‌.

Example: A scaffold 12 meters high requires a base width ≥4 meters.
‌Stability Mechanism‌
This ratio prevents tipping under loads (workers, materials) or environmental forces (e.g., wind) by ensuring sufficient counter-leverage against overturning.

‌Unit Flexibility‌
The rule applies universally:

Metric: 1 meter base per 3 meters height.
Imperial: 1 foot base per 3 feet height.
⚠️ ‌Critical Compliance‌: Violating this rule significantly increases collapse risks. Regulatory bodies (OSHA, EN) enforce it for all freestanding scaffolding systems.