In this video

After installing and taping the Soundmat 3 Plus, prepare the room for carpet installation. Begin by installing carpet gripper risers around the entire perimeter of the room. These risers are essential because they allow you to fix your carpet gripper rods without needing to penetrate the sound mats, thereby preserving their integrity. They also ensure the gripper rods are at the correct height relative to the sound mats and add an extra layer of soundproofing around the perimeter, preventing weakness under the gripper rods. Once the risers are in place, install your carpet gripper rods, fixing them securely through the riser and into the subfloor below. Finally, your carpet can be installed directly on top of the Soundmat, which effectively functions as an underlay, eliminating the need for any secondary underlay.