3-in-1 Installation Instruction 1. 2. 3. 4. 5. Be sure floor is clean and dry before installing underlayment. Roll out underlayment over the substructure. Seams should be butted together, leaving no gaps or overlaps. Flip the first row’s overlapping lip over to the second row and secure it to the top of the second row using the adhesive tape strip located on the overlap ping lip. To activate the adhesive just remove the release liner and apply hand pressure to seal the seams. Repeat this process until the entire floor is covered and sealed. It is not necessary to tape the outer perimeter of the installation. After underlayment installation is complete, install your floor per the flooring manufacturer’s instructions.