Green Roof Noise Reduction

Commonly used porous growing substrates were shown to have good sound absorbing properties when dry.

Green roof noise reduction.

At novartis lab in cambridge an extensive green roof and paver patio overlooking the park create a rooftop respite for staff. 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. The soil blocks lower frequencies and theplants block higher frequencies reduce the space used for landfills. A green roof reduces the temperature on the roof.

Noise reduction a green roof system provides good sound insulation keeps the living space quieter and creates more pleasant surroundings in urban areas. Plants soil and air trapped in the soil are great acoustic insulators. Green roofs can help reduce external noise pollution by 10 to 50 decibels depending on the thickness of the system cities 2006. This may not seem much but for the human ear an 10 db reduction in noise levels is 50 quieter.

Sound waves are both absorbed reflected or deflected. 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 roofs have excellent noise attenuation especially for low frequency sounds as opposed to hard conventional roofs which tend to just deflect it. It contributes to noise reduction in large cities near industrial areas and airports.

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. Green roofs can increase a building s marketability. Green roofs have excellent noise attenuation especially for low frequency sounds.

Green roofs reduce sound resonance by 3 db and provide sound insulation of up to 8 db. The degree of sound insulation will depend on the thickness of the green roof structure. 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. The combination of soil plants and trapped layers of air within green roof systems can act as a noise insulation barrier.

Serves as a sound dampener insulating a building for noise reduction. With regards to acoustic advantages green roof systems have been deemed an important structure in the reduction of noise pollution especially in urbanised areas.