Noise protection that grows.

How a noise barrier works

1. 0104

   Without a wall, the noise travels freely

   Sound spreads from the road in all directions. In this example, about 72 dB(A) reach the house 25 m from the road.

2. 0204

   The wall casts a sound shadow

   A 4 m wall interrupts the direct path. Behind it, only sound diffracted over the top of the wall arrives, and it is much weaker. At the house the level drops to about 54 dB(A) in this example.

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   What counts is the detour over the top

   The longer the detour compared with the wavelength, the deeper the shadow. That is why height and position matter most. Low tones, such as the hum of transformers and battery storage, bend more: at 100 Hz the same wall reduces the level by about 12 dB instead of 18 dB.

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   And it turns green

   The shielding comes from the wall body, a steel cage filled with soil from the excavation. The planting changes little about that. It turns the structure into a green wall that blends into its surroundings.

Worked example, 4 m wall. Source 0.5 m high, 5 m in front of the wall. Receiver 2 m high, 20 m behind it. Simplified model (diffraction after Maekawa), not a product value. The actual effect follows from the noise forecast for your project. Cross-section, to scale.