#1...pre-fab, reinforced, 6 cm thick concrete slabs are laid on the sub-floor struts, and tied down, then
#2...steel reinforcing is laid then covered with a 5cm skin that is carefully laid so it is perfectly flat.
Here you can see the first of 4 truck loads of slats already in place. It was fun to watch the delivery, especially as the truck got bogged on the building site...twice!