DEM/General/TBT-DEM-009

Structural Stability During Demolition

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Demolition progressively removes structural elements, changing load paths and reducing stability.
Premature or uncontrolled collapse is the greatest risk during demolition work.
A structural engineer must assess stability at each stage of the demolition sequence.
Temporary propping or bracing may be needed to maintain stability during progressive demolition.
Removing load-bearing walls, columns, or bracing members without assessment can cause sudden collapse.
The demolition method statement must specify the exact sequence of element removal.
Pre-weakening structures for mechanical demolition creates hidden instability risks for operatives.
Weather conditions including wind and rain reduce the stability of partially demolished structures.
Adjacent structures and party walls must be assessed for the impact of demolition on their stability.
BS 6187 provides the code of practice for demolition and requires stability assessments at every stage.

Prevent collapse	Uncontrolled structural collapse during demolition causes multiple fatalities and is often entirely preventable with proper planning.
Changing load paths	Every element removed changes how loads travel through the structure. Without assessment, progressive failure becomes likely.
Legal requirement	CDM 2015 and BS 6187 require that demolition is planned by competent persons with stability assessed at every stage.

Don't

Follow the demolition sequence in the method statement exactly as written.
Obtain a structural assessment before removing any load-bearing element.
Install temporary propping or bracing where specified by the structural engineer.
Monitor the structure for signs of movement, cracking, or distortion daily.
Establish exclusion zones around areas at risk of uncontrolled collapse.
Assess the impact of demolition on adjacent structures and party walls.
Stop work in high winds and reassess stability of partially demolished structures.
Brief all operatives on the sequence and any changes to the demolition plan.
Ensure a competent engineer is available to advise during complex demolition stages.
Record each stage of demolition and confirm stability before proceeding further.

See also: Demolition Safety Awareness | Pre-Demolition Survey Requirements

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