Hi all . First time poster so thank you all for bearing with me. Just over two years ago my wife and I had the whole of our ground floor of our house fitted with engineered oak wood. It was installed by a tradesman on a concrete floor throughout the whole of the ground floor Which was not levelled and I suspect not -00% perfect The wooden floor covers the entirety of the ground floor, including between the doors etc literally all wood, no gaps between each room Door. Last year, I noticed that the two small planks that fit between the living room and hallway where the doorframes are, were dipping where they fitted together. Consequently, the planks that are against those are raised slightly. So if you run your foot over it, you kind of feel a slight up-and-down movement, and it means that the door is jamming against the floor when I try and open or close the door. not all of the wooden planks throughout the whole ground floor floor like this, it seems primarily around one door and the subsequent planks that are up against those (being opposite to the dip.) I seem to remember that over the winter period it levelled out a bit more, and then appeares more in the summer, but at the moment they are still dipped and haven’t gone back. I remember the fitters saying that our concrete floor had a high moisture content, and I’m struggling to think whether I can actually do anything now the whole floor is down other than sand more off the bottom of the door Apologies, for wittering on and I am sure I’m not very clear, but I wanted to see if there was any experts out there, who might be able to offer any thoughts. Do I get him back ? I suspect he will say I told you I was not perfect.