At the end of this phase there will be a flat concrete slab over
the footprint of the house, ie over the whole basement area.
Initially the foundations only need to support the basement level,
but they are implemented to support the whole house. This
phase does not include the foundations for the decking or
In the slab under where the walls will go, there will be an inset keyway with three feet of corrosion-proof rebar sticking up.