Green Roof Noise Reduction

An extensive green roof can reduce sound from outside by 40 decibels while an intensive green roof can reduce sound by 46 50 decibels peck et al.

Green roof noise reduction.

It contributes to noise reduction in large cities near industrial areas and airports. Green roofs are able to reduce the sound exposure near or inside a building by mitigating diffracting sound waves over parts of roofs and by reducing sound transmission through the roof system. Green roofs have excellent noise attenuation especially for low frequency sounds. The soil blocks lower frequencies and theplants block higher frequencies reduce the space used for landfills.

At novartis lab in cambridge an extensive green roof and paver patio overlooking the park create a rooftop respite for staff. The combination of soil plants and trapped layers of air within green roof systems can act as a noise insulation barrier. A green roof reduces the temperature on the roof. The degree of sound insulation will depend on the thickness of the green roof structure.

Sound waves are both absorbed reflected or deflected. With regards to acoustic advantages green roof systems have been deemed an important structure in the reduction of noise pollution especially in urbanised areas. Plants soil and air trapped in the soil are great acoustic insulators. Green roofs reduce the need for on site storm water management.

Green roofs can help reduce external noise pollution by 10 to 50 decibels depending on the thickness of the system cities 2006. Green roofs can increase a building s marketability. Commonly used porous growing substrates were shown to have good sound absorbing properties when dry. Noise and sound insulation a green infrastructure service in the urban realm sound insulation is often overlooked when it comes to green roofs and green walls.

Serves as a sound dampener insulating a building for noise reduction. Tests indicate that green roofs can reduce indoor sound by as much as 40 decibels which is of great advantage to occupants of buildings affected by airports industry trains and traffic. Reduces ambient noise outside and inside. This may not seem much but for the human ear an 10 db reduction in noise levels is 50 quieter.

Green roofs reduce sound resonance by 3 db and provide sound insulation of up to 8 db. Green roofs protect the roof membrane from damage and wear extending the life of the membrane 2 to 3x lowering the volume of materials deposited in landfills.