Sweep and mop the floor to remove any dirt and other contaminants.
Roll out the foam padding over the entire floor, the waffle side facing up. Trim the foam as needed to fit properly. Fill the entire room, leaving no empty space between the foam and the wall.
Roll back approximately half of the foam padding on one side of the room.
Open the windows for ventilation, then apply padding adhesive to the floor, using the brush or paint roller. If you don't have windows in the room, use low-VOC (volatile organic compound) adhesive.
Unroll the foam padding, pressing it into the adhesive. You have adhered half of the padding.
Roll out the other side of the foam padding and apply adhesive to the other side of the floor.
Unroll the foam padding and press it into the adhesive.
Allow the adhesive to dry for the amount of time recommended on the container.