From the early part of the twentieth century it became accepted practice to cover the site of buildings with a layer of concrete some 100 mm thick the concrete oversite or oversite concrete.
Concrete oversite floor.
These are laid on top of the inner leaf of the walls sitting on the dpc but with no mortar bed.
The floor is made up of precast concrete beams shaped a bit like the rails on a train track.
The 440mm gaps left between the beams are then filled with standard size foundation blocks until the entire floor is one flat slab.
As nouns the difference between oversite and oversight is that oversite is a flat solid layer of concrete serving as a base for flooring while oversight is an omission.
Like everything it is a very important step as it is what you will be essentially walking on when the extension is built.
At the time many ground floors of houses were formed as raised timber floors on oversite concrete with the space below the floor ventilated against.
Oversite concrete is often reffered to as german floor by the laymen others mistook it for dpc however oversite concrete is the mass concrete that you pour to cover the entire lenght and breadth of a building on the ground floor to serve as a source of additional support to the structural stability of a building especially storey buildings.
Something that is left out missed or forgotten.