How does a green roof help in terms of sound insulation?
It has been proven that green roofs can insulate up to 3dB for internal sound insulation, and up to 8dB for reflective sound. The layers of the green roof build-up, such as, substrate, plants, and trapped air, help to provide insulation of sound waves. Expressed in figures this might not be very impressive, but a noise reduction of 10dB appears to the human ear as a noise reduction of 50%. This can be especially advantageous for buildings near airports, or perennial machine activity as well as for noisy discotheques. In addition, high frequency electromagnetic radiation from mobile stations can also be effectively shielded.
