That’s fine. One of the many excellent properties of Golv tiles is that an air gap is formed between the damp floor and the new flooring surface. As Golv tiles do not need to be glued or screw/nailed to the surface underneath, this allows the damp concrete floor to breathe. Unlike traditional floor coverings that seal in the moisture and can cause an unpleasant smell, you get an odour-free floor covering on which you can store boxes and furniture, safe in the knowledge they will not absorb moisture.