The 5 mm underlays with aluminum are a type of flooring material with built-in self-adhesive tape. This tape makes it very easy to install the underlay because you don't need any extra adhesives or tapes. This feature saves you time and effort during installation. The self-adhesive tape also ensures a strong and secure bond between the underlay and the floor panels or subfloor. This prevents the underlay from moving or shifting over time, which helps it continue to work effectively in terms of insulation, leveling, and reducing noise. Additionally, these underlays have a damp-proof membrane, which means they can protect against moisture getting through. This is important because it helps prevent the growth of mold and fungi, which can be harmful. This membrane also adds extra protection for the subfloor and the indoor environment. The 5 mm underlays with aluminum are known for being very dense and well-made, so they are durable and last a long time. Thanks to their flexible backing, they are designed to even out any bumps or uneven areas on the floor. This creates a smooth and level surface for your flooring. These underlays have also received technical and hygienic certifications, which means they meet certain quality and safety standards. This makes them a good choice for use in construction and public buildings where quality is essential. Lastly, it's worth mentioning that these underlays are 100% recyclable, which makes them an environmentally friendly option for insulating your floors and improving sound comfort.