In order to reduce and prevent acoustic sound, its propagation must be stopped. Each solid acts as a reinforcement membrane. With increasing impermeability, building materials and materials for a soundproof wall suppress the vibrations. The two-layer structure also decouples the sound waves.
Construction interrupts sound propagation
Sound travels in waves in the open air. Wherever they hit, they create the audible noise. The noise barriers on roads, for example, are primarily used to "intercept " and "divert " the sound waves. The bell that would otherwise move through the air is destroyed on impact. Depending on the structure of the soundproofing wall, discharges can be achieved by diversion in other directions and by "swallowing" the absorbent materials.
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In buildings and house walls, the waves trigger vibrations when they hit walls and floor ceilings, which reliably transport the noise. Sound insulation in interiors consists of a combination:
- Reflection of the sound waves upon impact
- Masonry made of dense materials
- Cladding or additional wall
- The nature and thickness of the wall materials
- Decoupling of the masonry and the porch
Sound insulation through filled cavity
If you build a single-shell acoustic wall yourself, you fill the cavity between the two wall panels with high-density insulating material. Possible insulation materials are:
- Polystyrene (styrofoam and styrodur)
- Mineral wool
- Wood fiber
The same structure is chosen for subsequent installation. A facing shell forms the cavity to the starting wall.
Decoupling is crucial
In the case of the single-shell as well as the double-shell construction, the wall parts must not touch and not be directly connected to one another by fastenings and profiles. Rubber compounds and elastic spring systems specially developed for acoustic walls do not form sound bridges.
The decoupling must also take place at the lateral approaches to the neighboring walls. Insulating strips or profile strips interrupt the connection. In general, soft materials should always be built into the composite system of the sound insulation wall. They transport sound less strongly than hard materials. The combination of heavy and therefore dense masonry and soft material with a high bulk density is ideal.Tips & Tricks You can achieve the same effect as a single-layer wall with a two-layer or multiple-layer construction of the soundproof wall with around ten percent of the material and thickness.