Hi,
Still, what you write is consistent with my experience of typical construction the way it is practiced by the Dutch. And it seems pretty characteristic of how they build.
Here is a picture of a house I renovated just up the road, although the pine planking is new. Originally there was only chicken wire there and then the roof tiles. I even have out in the barn, floor boards like the ones you describe, one layer of many stacked on top of one another, waiting to be put down here in the house.
Is this something like what you have seen?

Greetings,

Don