Why this matters
Before work starts, use this Structural Instability During Demolition talk to cover progressive collapse and unsupported components. Point out the equipment, work zone and controls the crew will rely on today. Demolition removes the very systems that normally keep a building stable and predictable. Hidden utilities, changing load paths, falling material and debris can turn a routine removal into a collapse, struck-by or exposure event.
A scenario to discuss
During Structural Instability During Demolition, demolition exposes an unexpected structural member, utility, material, void, or connection. It is not obviously dangerous, but it was not part of the sequence. What should remain untouched until the condition is evaluated?
Before work starts
- Review the engineering survey/work sequence and identify structural, utility and hazardous-material assumptions.
- Verify utility isolation and establish debris/falling-object exclusion zones.
- Plan stable access and debris removal so changing conditions do not trap the crew.
- Review the pre-demolition survey, structural conditions and sequence before removing components.
- Verify utilities are identified, shut down or otherwise controlled before demolition reaches them.
Common failure points
- Removing a component that is carrying load or bracing something the crew did not recognize.
- Creating an uncontrolled debris/falling-object path.
- Encountering utilities or suspect hazardous material and continuing instead of stopping.
Safe work sequence / controls
- Review the pre-demolition survey, structural conditions and sequence before removing components.
- Verify utilities are identified, shut down or otherwise controlled before demolition reaches them.
- Establish an exclusion zone for falling debris and keep workers out from under unstable or unsupported material.
- Control dust, sharp debris and falling-object hazards as material is removed and transported.
- If conditions change, stop long enough to make sure the control for progressive collapse and unsupported components still works for the job in front of you.
Stop and reset the plan if...
- The structure/material differs from the survey or sequence, or unexpected movement/cracking occurs.
- Utilities have not been isolated/verified or suspect hazardous material is encountered.
- Debris, falling-object zones or access routes cannot be controlled as planned.
Questions worth asking the crew
- What part of the structure/material could behave differently than expected when we remove the next piece?
- Which utilities or energy sources have been isolated, and how was that isolation verified before demolition reaches them?
- Where can debris, material, or an unsupported component fall, roll, swing, or hang up, and who must be outside that zone?
- What unexpected movement, crack, material, void, or connection means we stop the sequence and get the condition evaluated?
- Has anyone uncovered an unexpected utility, structural condition or material during demolition? What was left untouched until it was evaluated?
Make it real on the job
Point out what is being removed, what supports it, where debris will go and what must stay isolated.
Close the talk
Before the crew starts, everyone should be able to explain the hazard, point to the control being used today, and name the condition that would make the work stop.
Related authoritative reference
29 CFR 1926.854 - Removal of Walls, Masonry Sections and Chimneys · Open reference ↗
This is a practical discussion guide, not a substitute for required training, a competent person, permits, manufacturer instructions, employer procedures, or applicable federal/state/local requirements. Adapt it to the actual task and conditions.
