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Noise and noise reduction

What is noise?

Noise is defined as unwanted sound. The sound is distributed through a range of frequencies - from deep bass to high frequency sound. The composition of this gives us a sound image, where the general height level is measured in decibels (dB). On the scale dB, 10 dB is counted as doubling / halving. There are regulations for how much is acceptable in different contexts in homes. If you get into conflicts about level limits, you must have professional measurement as a basis.

Many people want a general improvement of a known ailment in the house. It can be footsteps, music, generally loud neighbors, traffic noise from outside. They want to rebuild the house, make rental housing, music / cinema rooms, etc. Then there are several aids, where we can offer a number of products with good properties.

In the past, noise problems were not taken as seriously. Less traffic, less density, fewer machines presented a different challenge than today. Even today, when we are aware of the need, homes are being set up that have significant noise problems. This is due to the complexity of the buildings, with a number of new needs and forms of construction. Although the noise reduction capabilities of all the simple materials are known, composition in complex geometric constructions, new forms of heating, etc., can give unintended noise effects.

Where does the noise go? Several roads

Sound waves, as the noise is, spread out like waves in the water. When they hit a material, something will be reflected back - especially from hard surfaces. The rest will go into the material and be transported through to the other side and some will follow the material in other directions and either be released or lose energy due to the reduction value that the material has. In an improvement situation, you can check that there is modern mineral wool between uprights and increase the mass further by using, for example, our heavy cloths Acoustiblokeller Tecsound, they are thin (2.8-3 mm) but still reduce the noise passage in the surface by approx. 80% (28/30 dB). You can also build on an existing wall, and break direct contact bridges between the building materials.

But the noise does not just go directly through the surface wall / ceiling / floor to the neighbors. There can also be a good deal of passage between flanks from the noise room to the neighbor - in walls, ceilings, floors, and adjacent pipe and ventilation systems, etc. Even if it is assumed to stop the "lion's share" with noise insulation on either wall / ceiling / floor, flank effect can affect the experience result afterwards.

Furthermore, the sound waves enter the building's structure, and the structural noise travels past neighboring rooms and further out. When this comes from particularly noisy sources such as engines, subwoofers, etc. it is wise to try to reduce such noise as close as possible to the noise source. Screens, perch plates, vibration blocks, etc. can reduce the output noise quite significantly. Especially in concrete constructions, such noise is led considerably outwards. If the noise is sufficiently low-frequency, it is often experienced as vibration that can be painful to experience. But fortunately there is some product against this as well. The problem gets worse if the noise creates resonance, ie the frequency of the noise matches the natural frequency of the structure and building parts. Then the noise will propagate and even be experienced amplified in simple typical frequencies. The solution then usually becomes to look at the noise source and try to change the speed and construction to achieve a different frequency, which is a difficult process.

A typical nuisance is footstep noise. A lot is taken by general noise insulation in the floor, but often it is best with a step sound plate as well, as this is more of a bass noise. We offer TEXFON, a soft 3.2 mm impact sound cloth that is easy to lay under the coating and this attenuates ΔLW (dB) = 22, which is exceptionally good in relation to the thickness.

Another typical nuisance of noise is reverberation or echo in the room. When several people are gathered and have activities, the noise bounces off walls and ceilings, especially where you have hard surfaces, typically kindergartens, schools, canteens, meeting rooms, swimming pools. Here we use absorbent plates that are mounted in the ceiling or wall, and where we have some standard figures for how to solve this. For example, the Danish Lydac Dempit is very effective. The power is measured in the time it takes to reduce the noise by 60dB.

Furthermore, one should observe that noise passes through small openings, gaps and holes that should be sealed. Screws and metal pins should be used as little as possible- (in several places you must) as they are good noise conductors- Direct contact of hard surfaces in the floor, wall and ceiling against other surfaces should be avoided to prevent transport of noise. Better with a small gap, which you fill with noise-reducing sealant such as Acoustiblok Sound Sealant.

On our websites you see some of our products. We hope the above will help you look for the right product for your noise problem! Feel free to contact us for more information. As you understand, it is difficult to create some guaranteed solution models for the individual cases, but we can guide with regard to products you should look at.

And remember: Modern noise reduction does not have to take up much space!