4-in-1 Installation Instruction 1. 2. 3. 4. 5. 6. Be sure the floor is clean and dry before installing underlayment. Starting in a corner, install the first row of underlayment. The moisture barrier must be facing upward. Install the underlayment to the far wall and cut around any obstacles using a utility knife. Align the second row of underlayment to the first row. Use underlayment tape to seal all seams. Seams should be butted together, leaving no gaps or overlaps. Repeat this process until the entire floor is covered and sealed. Ensure that all foam seams are sealed with underlayment tape (sold separately). It is not necessary to tape the outer perimeter of the room’s underlayment. After underlayment installation is complete, install your floor per manufacturer’s instructions.
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