What are the acoustic benefits of multi-layer façade panels?

Multi-layer aluminum façade panels combine metal skins with internal layers—acoustic foam, mineral wool, and air cavities—to deliver both structural protection and sound attenuation. The outer aluminum layer blocks high-frequency noise, while the absorbent core dissipates energy from mid-range frequencies. An internal air gap, typically 20–50 mm, creates a Helmholtz resonance effect that attenuates lower frequencies. Laminated viscoelastic interlayers further dampen panel vibrations caused by wind or external noise. Together, these layers achieve sound reduction coefficients (STC ratings) above 40 dB, suitable for urban façades near highways or airports. Architects value the slim profile—often under 50 mm total thickness—for minimal impact on building depth while delivering significant acoustic comfort inside occupant spaces.