If laying laminate flooring over concrete use good underlayment
When laying laminate flooring you have to follow some basic rules to get best results. If you are laying laminate over concrete, you have to make sure that subfloor is dry. If concrete is not dry, laminate flooring can be permanently damaged. Use of good quality underlayment is recommendable because it serves as a sound, water and temperature barrier. It also levels out smaller imperfections on concrete surface. Most common laminate flooring is installed with click system using floating method.