The thickness of the underlay depends on the level of noise reduction you need, the type of flooring you’re using, and the acoustic performance you’re aiming for. Typically, thicker underlays offer better soundproofing, but you should also check the compatibility with the flooring to avoid height mismatches.

Yes, acoustic underlay is typically easy to install, and many options come with self-adhesive backing, making the process more straightforward. However, for more complex installations (like in commercial or multi-floor settings), professional installation might be required.

Acoustic underlay is designed for use under floors to reduce noise transmission through them. For walls and ceilings, other specialized soundproofing materials such as acoustic panels or insulation are generally more effective.

High-quality acoustic underlay can last for many years without losing effectiveness. The exact lifespan will depend on the material used, the quality of installation, and the level of foot traffic or activity in the area.