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Outward noise insulation

Noise insulation is much more complicated than pure acoustic improvement or resonance removal. Here, you will learn how best to insulate ceilings or walls or how you can ideally insulate, for example, generators, pumps, compressors or other loud devices.  Also read our large online guide.

Please do not use convoluted foam for noise insulation. Plane and heavy sheets such as our ester sound insulation or our rebond foams are better. Our rebond foam is even better here than our ester sound insulation because it is heavier -but the rebond sheets are also somewhat more expensive.

First, you need to prevent the sound from hitting walls or ceilings directly. It should be absorbed in advance, for example, by the foam to prevent the masonry from vibrating. The lower the frequency of the sound source, the thicker the foam should be! In this case, we recommend our ester sound insulation foam (you will find this in the section “Sound Insulation”) or even better, our rebond foam (in the section “Rebond Foam”). These foams are heavy and very well suited for noise insulations.


You can construct a 3-layer construction to achieve even better insulation. This works as follows. 
You first mount on the wall, for example, ester sound insulation or rebond foam. You adhere this first layer with our mounting adhesive and let it dry for a few days. If the adhesive is set, then adhere to it a heavy bitumen sheet or heavy foil (you will find these sheets here) and then on it again an ester sound insulation sheet or our rebond foam. The bitumen sheet/heavy foil is double-sided self-adhesive so that you can simply adhere the last foam layer directly to the bitumen sheet - in some cases, it is advisable to use spray adhesive also or to fix it mechanically. The thicker you choose this construction, the better our noise insulation turns out, particularly for low frequencies, but then the heavier it is and naturally the more expensive also! It may be necessary for you to support the sheets so that the adhesive can set. A lot of adhesive is necessary, especially for ceiling mounting, and support is usually required here.

How does this construction work?
The sound first hits the outer foam sheet, penetrates this in part and causes the central bitumen sheet to vibrate. This bitumen sheet distributes the energy over the two foam sheets (thus on the front sheet and the foam sheet behind it. Thus only a fraction of the energy reaches the wall, depending on the thickness!

Very low frequencies (under 50 Hz), which you not only hear but also feel, are problematic! The floor conducts the noise outwards via structure-borne sound (and even more or less around the foam on an insulated wall!). It is important to lay a thick carpet and to decouple relevant devices from the floor: For the sound-emitting device, for example, build a platform with 4 cm to 8 cm absorber sheets as a base layer and place a stable wooden board on it. Thus the structure-borne sound can be transferred only attenuated to the floor. This applies to all devices that vibrate.
However, it has often been seen in practice that medium and high frequencies are usually experienced as more disturbing - however, these are often well attenuated with medium foam thicknesses.