Green roofs can absorb sound with both substrate and plants making a contribution. Hard surfaces tend to reflect sound rather than absorb it.
The combination of soil, plants and trapped layers of air within green roofs can act as a sound insulation barrier and reduce noise pollution with both substrate and plants making a contribution.
The substrate blocks lower sound frequencies and the vegetation blocks the higher ones. A green roof can reduce noise pollution from machinery, traffic and aeroplanes.
The amount of sound insulation is dependent on the Lindum green roof product and the substrate depth.
The Lindum SedumPlus Mat has a substrate layer of 50mm-75mm which can reduce sound by 20dB. The Lindum Wildflower & Sedum Mat has a depth of 75mm-100mm which can reduce sound by 30-40dB.