Smooth the subfloor to remove raised areas. Plane or sand away high spots on wood subfloors and remove and replace any protruding nails or screws. Grind away raised bumps or drips of concrete in concrete subfloors, using a grinder. Wear safety glasses to protect your eyes as you work.
Sweep or vacuum the floor to remove all dirt and debris.
Roll the Dream Home QuietWalk underlayment over the subfloor. Keep the blue vapor barrier side of the material facing up at all times. Leave a 1/2- to 3/4-inch gap along the base of each wall in the room to allow for expansion and contraction. Cut the roll of QuietWalk with a utility knife as needed to fit the space; butt the seams of each row of material together without overlapping.
Tape all seams between rows of QuietWalk, using utility-grade duct tape. Press the tape firmly in place to ensure it adheres to the underlayment.
Install your laminate or floating wood floor over the underlayment according to the manufacturer's installation instructions.