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Noise Control / FAQ

What is the difference between sound insulation and sound attenuation?

 

What special aspects are to be observed with regard to fire protection?

 

Which material is suitable for which application?

 

Is there a material that combines efficient sound insulation with a good heat insulating effect?

 

Which sheet thickness is recommended?

 

Is it necessary to cover the whole room with acoustic foam?

 

How are the sheets fixed on the wall and the ceiling?

 

 

What is the difference between sound insulation and sound attenuation?

 

How can we controle noise?

We can insulate it!

We can attenuate it!

 

We speak of sound insulation when reflective surfaces/materials deflect the sound waves in other directions and thus prevent the sound from propagating in this direction at the same intensity.

 

We speak of sound attenuation when a part of the sound vibrations is converted into thermal energy and hence gets “lost”.

 

More explanations – for your information:

Solid-borne noise

Solid-borne noise is a sound wave spreading in a solid medium or on the surface of a solid object.

 

Solid-borne noise attenuation

Solid-borne noise attenuation: Due to energy conversion of the sound waves, the attenuation material - a homogeneous layer glued or otherwise fixed to the solid object - prevents the conversion of solid-borne noise into airborne noise.

 

Solid-borne noise insulation

Solid-borne noise insulation: An elastic layer reflects the sound waves and thus prevents their propagation.

 

Airborne noise

Airborne noise is a sound wave that is transmitted through the air.

 

Airborne noise insulation

Airborne noise insulation: Airborne noise is insulated when separating planes are equipped with heavy and preferably flexible materials that prevent the passage of the sound waves.

 

Airborne noise attenuation

Airborne noise attenuation: The acoustic energy is reduced by (external) friction on the boundary surface of the porous absorber materials, which have an especially large frictional surface. Normal or even heavily structured surfaces do not create sufficient friction.

 

Noise absorber

Noise absorber: Absorbers are materials that absorb noise. Porous absorbing materials such as mineral fibres, open-celled foams or acoustical ceilings absorb noise mainly in high frequency ranges. Resonance absorbers such as foils or sheets are mainly used for lower frequency ranges

 

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What special aspects are to be observed with regard to fire protection?

For the security of buildings in case of fire, construction materials usually have to fulfill certain fire-safety requirements – especially in public buildings or institutions.

 

Among others there are the following fire-safety categories:

 

Building Material Class B1:

This category comprises materials that are classified, according to DIN 4102, as difficult to ignite or as self-extinguishing and that are consequently suitable for use in buildings.

 

The following list catalogs those of our products that comply with Class B1 requirements for building materials (only non self-adhesive versions)

 

  • soni PROTECT
  • soni PROTECT F
  • soni WAFFLE
  • soni TRAPEZ
  • soni RESIST

 

Attention:

Please note that only the non self-adhesive versions of our products fulfill the categorization B1 because the categorization does not apply to the adhesive.

 

Building Material Class B2:

This category comprises materials that are classified, according to DIN 4102, as normally-flammable and that are suitable for use in buildings.

 

General advice:

When there is no obligation to fulfill any fire-safety regulations, the choice of the appropriate material is left to one’s own best judgment. Even if the risk of fire is rather low, our advice is to deal with the question of fire safety before installation starts. In case of any doubt, please ask your local fire brigade or a public fire protection department.

 

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Which material is suitable for which application?

We’re offering you the following different noise reduction foams:

    • Polyurethane foams (PUR)
    • Polyethylene foams (PE)
    • Melamine resin foams (Melamine/Basotect)
    • Bitumen heavy foils

     

    Since each material has its special characteristics and benefits, we can select the most suitable for your specific application.

     

    Polyurethane foams (PUR)
    Our polyurethane foams are very elastic, open-celled foams that are particularly suitable for the noise reduction of:

      • Machines / apparatus / compressors
      • Measuring cabins / vocal booths
      • Rehearsal room / sound studio
      • Sound insulation hoods and enclosures
      • Workshop / basement work room / garage

       

      Our product range comprises the following polyurethane foams:

      • soni WAVE
      • soni DECOR
      • soni COMPOSITE (combination of a polyurethane foam (PUR) and a synthetic heavy foil)

       

      Polyethylene foams (PE)

      Our quality soni RESIST is a very robust, open-celled polyethylene foam, whose low water absorption capacity (< 1 vol.%) makes it especially suitable for applications where direct contact with water or humidity is probable.

      soni RESIST fulfills the requirements of Building Material Class B1 and is thus especially suitable for use in buildings.

       

      Other typical applications are:

        • Office / Conference room
        • Indoor swimming pool / sauna
        • Rehearsal room / sound studio
        • Production hall
        • Party room

          Melamine resin foam (Basotect)

          Our melamine foam products are acoustically very effective open-celled foams with excellent sound absorption values and high temperature resistance (up to 180 °C). The non self-adhesive versions of all our melamine foam products meet the requirements for Building Material Class B1 and are thus especially suitable for use as wall and ceiling coverings. Their excellent heat insulating properties of our melamine foam products are a welcome side effect.

           

          We are offering the following products made from melamine resin:

           

          • soni PROTECT
          • soni PROTECT F
          • soni PYRAMIDE
          • soni TRAPEZ

           

          Available as sheets with plane surface (soni PROTECT / soni PROTECT F) or with esthetically appealing surface (soni WAFFLE) - our melamine resin foams allow you put optical highlights to your room.

           

          Typical applications are for example:

            • Office / Conference room
            • Hobby room / playroom
            • Party room
            • Bistro / night club
            • Music rooms

              Bitumen heavy foils

              Our products soni HEAVY and soni HEAVY ALU are bitumen heavy foils that are mainly used for sound insulation and attenuation of metal parts or metal sheets and for the prevention of unwanted vibrations.

               

              Typical applications are for example:

               

                • Vehicles
                • Machines / apparatus / compressors
                • Sound insulation hoods and enclosures
                • Doors / windows / roller shutter casing
                • Stairs

                   

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                  Is there a material that combines efficient sound insulation with a good heat insulating effect?

                  Yes, there is: our melamine foam products meet both requirements. They boast excellent sound absorption values as well a high heat insulating effectivity comparable to polystyrene.

                   

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                  Which sheet thickness is recommended?

                  Generally we can say that the thicker the foam, the better the sound absorption effect.

                   

                  In general, a foam sheet of 30 mm thickness is sufficient to achieve a very good sound absorption effect, if the noise source chiefly generates medium or high frequencies. In case of lower frequencies (bass notes), a foam thickness of 50 mm is recommended. As a general rule: the lower the frequencies, the thicker the foam sheets needed for optimum noise reduction.

                   

                  Another general rule: The higher the rooms, the thicker the foam sheets should be. For effective noise absorption in a production hall we recommend for example 50 mm thickness.

                   

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                  Is it necessary to cover the whole room with acoustic foam?

                  As a general rule: The more of the surface of the walls and ceiling is covered with acoustic material, the less sound will be reflected.

                   

                  100 % covering, however, will almost never be needed neither do we suggest it because the resulting total lack of natural reverberation would make the room feel disagreeably sound-dead.

                   

                  For a really good result, it is generally sufficient to cover approx. 40 to 50 % of the wall and ceiling surface.

                   

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                  How are the sheets fixed on the walls and the ceiling?

                  We recommend the use of our soniflex special adhesive to fix the acoustic sheets.

                   

                  It is also possible to fix the sheets mechanically by means of soni fixing set.

                   

                  Acoustic baffles are hung from the ceiling by means of

                  foam suspension spirals that are easily inserted into the sheets and suspended from hooks.

                   

                  Most of our products are available equipped with a self-adhesive rear face, which mainly serves as an assembly aid, however. When applied on vertical surfaces or overhead, additional mechanical fixation is recommended. In case of our heavy foils soni HEAVY and soni HEAVY ALU, the self-adhesive bedding ensures good contact to the entire support surface, ensuring that the bitumen heavy foil can achieve the required sound attenuation performance.

                   

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