Always read the flooring manufacturers recommendations and instructions before installing the underlayment.
How to lay vapor barrier on concrete under laminate flooring.
Install a plastic vapor barrier.
The best way to install the vapor barrier is put it down before you put any laminate flooring down and what i m going to do is i m going to go ahead and cut a piece of tape so that way i can put.
If your concrete passes the moisture test then plastic sheeting at least 6 mils thick will prevent moisture from getting into your laminate flooring.
This 3 in 1 underlayment can be used under any laminate flooring to allow your floor to float and create a moisture barrier.
Before rolling out the underlayment be sure to sweep vacuum and remove all debris on the substructure.
How to install vapor barrier on concrete floor under laminate flooring.