Using limecrete to create the main slab maintains the breathability of the soil underneath and prevents moisture from being forced up and around an otherwise concrete slab, into the walls.
However limecrete has a few drawbacks in relation to cost and labour. It is not available to be delivered by cement truck; this means it all has to be mixed manually, barrow after barrow, which is very labour intensive. It's also a more expensive mix than tradition concrete.
The mixer and tonne bags of sand below:
25kg bags of hydraulic lime:
The front room complete:
Under the archway to the adjoining rear room, the kitchen:
Front room entrance from the hallway with a heater to keep the temperate higher (approx 5 Celsius outside):
Limecrete laid by the front door to get the initial level: