What are the signs of dangerous roof or rib conditions that require stopping work?

• A. Slight creaking of the timber.
• B. A wobbly cart.
• C. Cool air blowing.
• D. Cracking, sagging, water seepage, movement of the roof, loose blocks; if observed stop work and inspect by a competent person.

Answer: (D)

Recognizing when the roof or rib is unstable and stopping work is essential for preventing a collapse. Cracking, sagging, water seepage, movement of the roof, and loose blocks are clear indicators that the rock itself may be failing or losing its support. When these signs appear, stopping work and having a competent person inspect the area helps determine whether additional support is needed or if operations must halt until it’s safe.

Other signs like slight creaking can occur in wooden timbers but aren’t reliable indicators of imminent failure, a wobbly cart points to equipment handling hazards rather than structural integrity, and cool air blowing relates to ventilation rather than roof stability. The first set of signs specifically points to structural danger and the proper action is to pause work and get a qualified assessment.