Hi Mikarooney,thought you had deserted us.
As far as I know the floor construction in all the new type of caravan builds such as the alu tech etc is still the same as it has been for the previous construction types. I know that many people have commented on how that might be a potential weakness in the Bailey alu tech design. The thinking there being that ok there is no wood or such in the walls to be damaged by dampness but any water ingress would go straight to the floor and that would be damaged.
Rob