I am building a new house and my building inspector warned me that the floor joists can shrink with time and the floor will sink accordingly. He says that he has seen vertical gaps of up to 10mm between the skirting board and the floor a few years after the house was built.
I recently rented a house where I was able to see this. Half way on the first floor walls there is a gap big enough to pass notepads under the skirting board from one room to another. Towards the ends of the walls the gap is minimal.
That the inspector was right is fine but what is the solution while you are still building the floor?