Stiffened raft slab
The stiffened raft slab is the simplest and most common slab construction. The stiffened raft configuration can be used on all classes of sites (except problem sites - Class P).
![Photo of a concrete slab on the ground.](images/page_002a.jpg)
Concrete slab on the ground
![Diagram of a section showing the stiffened raft design. The diagram shows the beam depth and spacing, the slab thickness (300 mm) and mesh, the bedding sand and vapour barrier.](images/page_002b.gif)
Section showing stiffened raft design
Refer to Figure 3.2.5.3 (b) of the Building Code of Australia.