The structure changes as you demolish
A building is a system. Remove an element and loads look for another path, and that path may run through members never designed to take them. A beam that has lost the bracing of the slab you just removed is a different beam.
That is why the demolition sequence is not a scheduling detail: it is part of the structural analysis. It must be defined by someone who understands how the system works, and it is not improvised on site for the sake of access.
Shoring: temporary does not mean approximate
Temporary shoring carries real loads during the most unstable period of the job. It is calculated, installed in full before anything is cut, and removed only once the permanent structure is working.
It is also the first thing cut when budgets tighten, and precisely where cutting is a mistake.
Vibration: the case for diamond cutting
Percussive demolition transmits energy into everything connected. In a building with sensitive equipment, live services or older structure, that energy is the problem.
Diamond cutting — blade or wire — separates the piece with no impact. What remains takes no vibration, and pieces come out whole and controlled rather than falling as rubble.
The lift plan governs everything else
Each block has to sit within the crane's capacity at its actual working radius, not at the catalogue maximum. Rigging points are defined before cutting, because they often require drilling the piece while it is still supported.
When the lift plan is left to the end, you get the piece that is already cut and that nobody can move. That is the scenario that stops jobs for days.
