1. Manual deconstruction or clipping

The oldest technique, "hand demolition" is still used today. It remains the fruit of the experience acquired by skilled craftsmen who possess a real empirical knowledge of the structures to be demolished.

The main buildings concerned are made of the following materials:

• millstone, rubble stone or ashlar for vertical walls;

• wooden joists, sometimes reinforced with metal beams (figure 1 );

• filler troughs between joists ;

• plaster partitions reinforced with planks.