The concrete subsurface was cleaned and separated by a moisture barrier provided by the supplier. This must be installed to minimise moisture from expanding the floor boards. I would strongly recommend that you read all the installation procedures and follow them if you are doing it yourself.
Tip: Before installing skirting boards, paint them. If you will be painting the walls, it is a good idea to paint before you fix. Alternatively, you can paint 200mm above the floor height then fix. This will make your painting job a lot easier and faster.