I purchased 6mm laminate floors for my home and I'm on a budget, can I use poly sheet vapor barrier and felt underlayment over my concrete floors or do I not even need both?
Pink rosin paper is just not a moisture barrier it's used to install hard wooden flooring over plywood. Use a moisture barrier two-in one underlayment or polyethylene sheeting with a foam underlayment. It is very most important. Underlayment is low-cost in comparison with the labor and fabric. Do it adequately. Additionally recall to depart a 1/4 inch gap around the whole perimeter of the floor to allow it to float freely and increase and contract. Stagger the seams. You will desire a tapping block to put in the laminate. Don't glue the seams. Read all manufacturers guidelines and comply with them precisely. Allow the floor to acclimate to the room for 48 hours prior to installation for most laminates. Excellent success along with your challenge.
Boo, you don't want to use felt paper. The vapor barrier that is sold at flooring stores comes in different grade levels. The lowest grade (or thickness) runs about .27 cents per square foot. These products are specifically designed for this application and they are the best products to use. When you say poly sheet vapor barrier are you talking of just about regular poly (ie:plastic)? If you are forget that idea. Moisture will get trapped under the floor and eventually ruin it from the bottom up. Like most people that are budgeted on projects, you want to save where you can. This is not one of them.
