DEM/General/TBT-DEM-021
Structural Stability Assessment During Demolition
Demolition › General › Structural Stability Assessment During Demolition
Toolbox Talk
Structural Stability Assessment During Demolition
As demolition progresses, the structural stability of the remaining building changes. Load paths are altered, bracing is removed, and walls that once supported floors may become freestanding and vulnerable to collapse. A continuous structural stability assessment ensures that the demolition sequence does not create an uncontrolled collapse risk. This talk explains why structural assessment matters during demolition and how it protects workers on site.
Key Hazards
Uncontrolled building collapse from removing structural elements out of sequence
Freestanding walls toppling onto workers or adjacent structures
Floor collapse from removal of supporting beams or loadbearing walls below
Falling masonry from destabilised parapets and facades during works
Control Measures
- Follow the demolition method statement sequence exactly as approved by the structural engineer.
- Ensure a competent structural engineer assesses the stability of the remaining structure at each stage.
- Install temporary propping or bracing where the engineer identifies instability risks.
- Mark and clearly sign exclusion zones around freestanding walls, parapets, and weakened structures.
- Do not alter the approved demolition sequence without written approval from the engineer.
- Monitor the structure for signs of movement, cracking, or unexpected settlement throughout.
- Brief all operatives on the current demolition stage and any areas that must not be entered.
- Stop work immediately and evacuate if any unexpected movement or cracking is observed.
- Record all structural assessments and inspection findings in the demolition safety file.
Remember
- Follow the approved demolition sequence exactly as specified by the structural engineer
- A competent engineer must assess stability at each stage as demolition progresses
- Never alter the sequence without written approval from the structural engineer
- Stop work and evacuate immediately if unexpected movement or cracking is observed
- Exclusion zones must be maintained around all freestanding walls and weakened structures
Applicable Legislation: CDM 2015 · BS 6187 (Code of Practice for Demolition) · Health and Safety at Work etc. Act 1974 · MHSWR 1999
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