Waffle raft slabs
Waffle raft slab construction is quite different from stiffened raft and footing slab structures. The slab ribs are formed on top of the ground using a grid of polystyrene void forms which are laid out on a levelled area. It is ideally suited to very reactive clay sites and does not have the problems associated with stiffened raft slabs that have their beams embedded in the reactive clays.
