Conventional demolition is planned demolition. Unconventional demolition is the demolition of structures damaged by a natural or manmade disaster.

Potential conventional demolition hazards identified in this module include falling materials, energized utilities, worker fall hazards, sharp objects, and toxic materials. Additional hazards that workers might encounter at an unconventional demolition site include unstable structures, downed power lines, gas leaks, dangerous animals, hidden debris, toxic chemicals, injured coworkers, or other injured victims.

In both conventional and unconventional demolition, worker safety is most important. In conventional demolition the contractor can perform preparatory operations. Because structures are intact, contractors inspect, survey, and collect samples to evaluate the project. The contractor is able to choose between manual or mechanical demolition methods. Demolition contractors should follow the OSHA 1926 Subpart T Demolition Standard.

In unconventional demolition the contractor cannot thoroughly evaluate a project. Manual removal of materials from unstable structures exposes demolition workers to excessive hazards. In unconventional demolition the contractor will choose mechanical demolition that protects workers. Cranes with a clam bucket or wrecking ball, excavators, and endloaders are commonly used mechanical demolition machines.

During hand or mechanical demolition continuing inspections by a competent person are made as the work progresses to detect hazards resulting from weakened or deteriorated floors or walls or other loosened material. No person should work where such hazards exist until they are corrected by shoring, bracing, or other effective means.



















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