The ground floor of a typical house in UK consists of various elements. This is demonstrated in the sketch above. There is the foundation, the footing course, the hard core filing, the sand layer the damp/radon barrier and the concrete slab. The first part is the cavity wall and is made of concrete blocks on top of the foundation and this wall goes up the ground level. It is also important to note that the floor level is made at least 230 mm above the outer ground. If the house design will use bricks for the outer wall, there has to be ample foundation for them and they usually start at lest 15mm below the DPC (damp proof course) level….