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Lexicon: I
Impact/footstep sound
Impedance tube
Impulse noise
Infrasound
Insulation
A B C D E F H I M N O P R S T U W
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A B C D E F H I M N O P R S T U W Start Page Table of Contents

Insulation

What does sound insulation mean?

Sound insulation refers to measures and materials that reduce unwanted noise or prevent it from spreading. The aim is to minimise noise and make living or working spaces quieter and more pleasant. Noise can cause stress, impair concentration and, in the long term, even affect health. That is why soundproofing is becoming increasingly important in everyday life. Particularly in flats, houses or during renovations, good insulation is crucial for a better quality of life.


Why is soundproofing so important?

Many sources of noise cannot be completely avoided – for example:
• Road traffic
• Neighbours
• Household appliances
• Heating or ventilation systems
• Music and home cinema

However, with the right soundproofing, you can significantly reduce noise and optimise the acoustics of a room. Soundproofing offers a quick and effective solution, particularly for DIY projects or specific problems.


What types of insulation are there?

1. Sound insulation
This prevents sound from entering from outside or from other rooms. Typical applications:
• Partition walls
• Doors and windows
• Ceilings and floors
• Machinery or equipment

2. Sound absorption
This reduces reverberation within a room. This improves the room acoustics, e.g. in:
• Home offices
• Music rooms
• Living rooms
• Restaurants or offices

3. Impact sound insulation
This prevents noise from being transmitted through the floor when walking or moving around.

4. Structure-borne sound insulation
This reduces vibrations and oscillations, for example from:
• Washing machines
• Heat pumps
• Technical equipment and systems

Many modern materials combine several of these functions.


What materials are used for insulation?

Depending on the application, various solutions are available:
• Acoustic foams
• Heavy-duty layers and composite materials
• Mineral insulation materials
• Vibration dampers and decouplers

These materials can reduce both airborne and structure-borne noise simultaneously, ensuring a quieter everyday environment.


Insulation in everyday life – typical applications

For private individuals, the following areas are particularly relevant:
• Insulating walls: to reduce noise from neighbours
• Improving ceilings: to reduce impact noise
• Decoupling appliances: e.g. washing machines
• Optimising room acoustics: to reduce reverberation
• Home office and gaming: o improve concentration

Even small measures can have a big impact.


Tips for effective soundproofing at home

✔ Identify the source of the problem first
✔ Combine insulation with sound absorption
✔ Consider airborne and structure-borne noise separately
✔ Use DIY solutions for quick improvements
✔ Combine several measures for serious problems


Conclusion

Insulation is a key component of modern noise protection solutions. It not only improves living comfort but also enhances concentration, relaxation and well-being. With the right materials and careful planning, many noise problems can be solved with a manageable amount of effort.


FAQ – Frequently asked questions about insulation

How effective is insulation against noise?
Good insulation can significantly reduce noise. Depending on the measures taken, improvements ranging from a few decibels to a noticeably quieter environment are possible.

What type of insulation helps with noise from neighbours?
Wall and ceiling systems that prevent sound transmission are particularly effective here. Absorbers also help to reduce reverberation.

What is the difference between insulation and absorption?
Insulation blocks sound, whilst absorption ‘swallows’ it within the room. Both measures complement each other.

Can I install insulation myself?
Many soundproofing solutions are easy to install – such as wall absorbers, mats or decouplers for appliances.

Which rooms benefit the most?
Living rooms, bedrooms, home offices, children’s rooms and music rooms benefit particularly greatly.

How quickly does soundproofing take effect?
Improvements are often audible immediately, particularly in terms of room acoustics and the decoupling of appliances.

Section of a PUR foam panel with black foil surface Section of a PUR foam panel with black foil surface
soni 491 STL
soni 491 STL – Sound insulation board with heavy foil for effective wall and ceiling insulation Combined sound insulation and sound absorption in one product Our soni 491 STL sound insulation board is a highly effective PUR foam-based sound insulation product that is additionally combined with a heavy bitumen foil. The acoustic foam with sound-permeable foil ensures optimum sound absorption, while the bitumen layer effectively insulates and blocks sound. This intelligent combination of materials combines both sound insulation and sound absorption properties in a single product – ideal for anyone who wants to effectively reduce noise and create a quieter environment. Areas of application – versatile, efficient and reliable soni 491 STL is used wherever noise and sound transmission needs to be reduced – for example: ✔ Wall insulation between neighbouring flats ✔ Partition walls or ceilings in apartment buildings ✔ Technical rooms, machine rooms or workshops ✔ Cellars, garages and house walls The sound insulation board is ideal for retrofitting existing walls or ceilings with sound insulation – for example, by constructing a facing shell or cladding partition walls. Tip for constructing a facing shell: A facing shell is a very effective way of significantly improving wall insulation between neighbouring properties. Here's how to do it: 1. Attach battens: Attach 30 mm or 50 mm thick wooden battens to the wall. Use our soni NBR sealing tape to insert an elastic layer between the wall and the battens. This prevents sound bridges. 2. Insert sound insulation boards: Fill the gaps with soni 491 STL to achieve both sound insulation and sound absorption. 3. Attach cladding: Screw plasterboard or chipboard onto the battens. 4. Decoupling & joint sealing: Separate the construction from the floor, ceiling and adjacent walls with a small gap and seal the joints with acrylate for maximum insulation performance. Tip: In our experience report ‘Neighbourhood / facing shell’, you will find a practical example of how soni 491 STL can significantly improve the sound insulation of a wall. Alternative with visible surface: soni COMPOSITE If plasterboard cladding is too costly for you, we recommend our soni COMPOSITE as an alternative. This material combines sound insulation and sound absorption like soni 491 STL, but has a decorative felt surface in various colours – perfect for visible areas. Advantages of soni 491 STL at a glance ✔ Combined sound and heat insulation ✔ Heavy bitumen foil for high sound insulation ✔ PUR foam for strong sound absorption ✔ Wipeable, micro-perforated surface ✔ Self-adhesive and easy to process ✔ Effective noise reduction between neighbouring flats ✔ Ideal for facing shells, wall insulation, ceiling cladding ✔ Easy installation with a cutter knife and adhesive surface

Content: 0.5 m² (€41.80* / 1 m²)

€20.90*
3 sound insulation panels in size A4 in different colors 3 sound insulation panels in size A4 in different colors
soni COMPOSITE
soni COMPOSITE sound insulation mat – effective sound insulation and sound absorption in one product The soni COMPOSITE sound insulation mat from soniflex is a highly effective combination of sound insulation and sound absorption. This acoustic product consists of a heavy plastic film (soni EVA) and high-quality acoustic foam with a decorative felt surface. This intelligent combination of materials reduces both airborne and structure-borne noise, resulting in a noticeable reduction in noise levels – ideal for use in living spaces, offices, workshops or technical facilities. Double effect – sound absorption & sound insulation While the soni EVA heavy-duty film reliably reduces sound penetration, the open-pored acoustic foam layer absorbs the sound within the room. This dampens the noise at its source and prevents it from spreading – a real advantage over single-layer materials. Typical areas of application: ✔ Partition walls & neighbouring walls in flats and offices ✔ Machine cladding & engine rooms ✔ Workshops & technical rooms ✔ Suspended ceilings & drywall constructions ✔ Music rooms & recording studios Use of soni COMPOSITE – versatile & effective The soni COMPOSITE sound insulation mat is particularly suitable for soundproofing walls and ceilings. Installed, for example, on the wall separating you from your neighbours or behind a facing shell, the material significantly reduces disturbing noises and ensures pleasant room acoustics. Thanks to its decorative felt surface, soni COMPOSITE is available in a range of colours – ideal when function and design are equally important. Easy processing & secure installation Processing soni COMPOSITE is straightforward and does not require any special tools: ✔ The mat can be cut to size precisely using a craft knife or scissors. ✔ The self-adhesive backing serves as an installation aid – however, mechanical fastening (e.g. screws, press studs or strips) is recommended for permanent attachment,     especially on vertical surfaces or for ceiling installation. ✔ Ensure that the substrate is dry, dust-free and smooth to ensure optimum adhesion. If necessary, you can cut soni COMPOSITE to the desired size with a craft knife. The self-adhesive backing serves as an installation aid. Tip: To create a clean finish at the joints, you can cover them with a wooden strip (8–10 cm wide) – this ensures a neat appearance and provides additional support. Safety & quality – tested for professional use soni COMPOSITE materials are age-resistant, moisture-resistant and free of fibres that are harmful to health. This makes this sound insulation mat a durable and safe solution for effective noise protection in both private and commercial areas.

Content: 0.5 m² (€59.80* / 1 m²)

Variants from €34.20*
€29.90*
Details
Section of a black plastic heavy foil soni EVA Section of a black plastic heavy foil soni EVA
soni EVA
soni EVA – Elastic heavy layer for sound and vibration insulation soni EVA is a soft, elastic heavy layer based on EPDM/EVA polymers with an admixture of flame-retardant minerals. It is ideal for technical applications, vehicle construction and mechanical engineering, where vibrations, rumbling and sound transmission need to be reduced. High-quality properties of soni EVA ✔ Vibration damping: Reduces the rumbling and vibration of metal and sheet metal structures. ✔ Sound insulation: Prevents the transmission of noise and ensures a quieter environment. ✔ Mechanical & self-adhesive: The self-adhesive backing serves as an installation aid, especially for horizontal surface mounting. For vertical or overhead mounting,     additional mechanical fastening is recommended. Areas of application for soni EVA soni EVA is a proven material for: ✔ Vehicles: doors, bonnets, boot, interior trim. ✔ Mechanical engineering: covers, metal structures, vibration protection plates. ✔ Technical applications: sound insulation in workshops, industrial plants, metal structures.

Content: 0.5 m² (€27.80* / 1 m²)

Variants from €14.40*
€13.90*
Details
Section of a black bitumen heavy foil soni HEAVY Section of a black bitumen heavy foil soni HEAVY
soni HEAVY
soni HEAVY – Highly effective heavy bitumen layer for sound and vibration insulation soni HEAVY is an elastomer-modified heavy bitumen layer laminated with a transparent polyester film. This combination ensures a particularly robust, durable and sound-insulating surface – ideal for applications in vehicle construction, mechanical engineering and technical insulation. Thanks to its high density and material flexibility, soni HEAVY offers excellent sound insulation and effective vibration damping. It prevents metal surfaces from vibrating, booming and rattling, thereby specifically reducing sources of noise. Advantages of soni HEAVY at a glance ✔ Effective sound insulation & vibration damping → reduces both structure-borne and airborne noise ✔ High material density for maximum sound reduction ✔ Self-adhesive backing for easy installation ✔ Mechanically resilient & durable ✔ Can be combined with acoustic materials such as soni COMPOSITE or soni 491 STL ✔ Suitable for technical applications, vehicles and machinery Typical areas of application for soni HEAVY ✔ Vehicle construction: engine compartment insulation, door panels, floor panels ✔ Mechanical engineering: sound insulation for housings, bonnets, covers ✔ Enclosures & panelling: soundproofing of sheet metal and partition walls ✔ Building services engineering: insulation of heating systems, roller shutter boxes, ventilation ducts ✔ Combination with acoustic absorbers: for optimised sound insulation solutions Installation instructions for soni HEAVY The self-adhesive backing makes it easy to apply to smooth, clean and grease-free surfaces. However, for vertical or overhead installation, additional mechanical fastening (e.g. with pressure strips or screws) is required to ensure permanent secure adhesion.

Content: 0.5 m² (€31.00* / 1 m²)

€15.50*
Details
A hallway with two doors, each with soni PORTA door insulation glued to it. The door insulation is not full-surface, but consists of 6 individual elements with an attractive felt surface that can be glued on precisely. The picture is anmier A hallway with two doors, each with soni PORTA door insulation glued to it. The door insulation is not full-surface, but consists of 6 individual elements with an attractive felt surface that can be glued on precisely. The picture is anmier
soni PORTA
Effective and comfortable door insulation with soni PORTA Earsplittingly loud music from your teenager's room, bothersome noise from the hallway, loud phone conversations from the adjacent office, lack of discretion in treatment rooms - wherever closed doors are supposed to provide undisturbed quiet, our door insulation kit is the ideal solution for effective noise reduction.Our soni PORTA solution consists of six precisely fitting elements that form an attractive pattern and are simply glued to the door using the two included installation aids and our easy-to-understand installation instructions. Thanks to our unique, protected self-adhesive solution, you can remove soni PORTA again from smooth surfaces without leaving any residue, if necessary, for instance when moving out.Elegantly shaped cutouts for the door handle, on the left or right as needed, complete the sophisticated design.Depending on the application, the material has to be mounted either on the inside or on the outside of the door. For this reason, soni PORTA has been designed in two standard heights. It is important to install the door insulation material always on the side of the noise source.Functional explanation: Sound waves spread out from the noise source and hit the nearest surfaces. In order for these waves to be effectively absorbed or dampened, the insulation material must be installed where the waves first hit – i.e. on the side of the door facing the noise source.soni PORTA is suitable for the sound insulation of any room door with rebate - in private homes as well as in day-care centers, kindergartens, schools, medical facilities, offices, hotels, banks, etc.The soni PORTA elements are made of a combination of two highly effective acoustic materials: a heavy layer and an acoustic foam layer. The heavy layer on the underside of soni PORTA is glued directly to the door leaf, increasing its mass and thus the overall sound insulation effect of the door. The visible side consists of an acoustic foam layer covered with an attractive felt material. The foam’s open cells absorb sound energy. The robust and dirt-repellent felt surface is available in trendy colors. The edges of the elements can be masked with our soni VLD adhesive tape, if desired.For ordering the soundproofing set that fits your door, you will need the outer dimensions of the door leaf. Please measure the width and height of your door leaf on the outside, i.e. on the side in the direction in which your door opens.Please note: If the gap between the door leaf and the floor is too wide, we recommend mounting a door sweep or a door bottom seal. Only when all gaps and openings around the door are closed, perfect soundproofing is possible. soni PORTA is also available in a version that is not removable without residue: soni PORTA Basic Important information on installing soni PORTA door insulation: Correct installation is crucial for soni PORTA to be fully effective: 1. unhinge the door before installation and place it in a horizontal position on a stable surface. 2. apply the individual insulation elements horizontally to ensure optimum adhesion of the adhesive. Do not apply when hanging! The weight of the integrated heavy film could cause the adhesive to come loose again (does not apply to soni PORTA Basic). 3. leave the door to rest for at least 24 hours after installation and only hang it up again the next day. This will ensure that the door insulation remains in place permanently and that optimum sound reduction is achieved!

From €259.90*
Details
Section of a soni RESIST PE foam panel for sound insulation and damping Section of a soni RESIST PE foam panel for sound insulation and damping
soni RESIST
Ordering acoustic panels from soniflex Our soni RESIST noise protection panel consists of closed-cell polyethylene foam with both sound-insulating and sound-absorbing properties. Its closed-cell structure makes soni RESIST especially suitable for applications where it may come into contact with moisture or humidity. The extremely robust and impact-resistant sound-insulation material does not constitute a medium for microorganism growth and can be wet-cleaned if necessary. soni RESIST is flame-retardant according to DIN 4102, as proven under B1 test conditions. Therefore the product is an excellent noise-control solution wherever you need to reduce the sound level with materials that meet strict fire safety regulations. Furthermore, soni RESIST ceiling and wall elements meet the ball impact resistance requirements of DIN 18032-3, making them ideal for noise reduction in sports halls and sports halls. The use of soni RESIST The optional self-adhesive rear face facilitates the installation of the panels. When mounted overhead or on uneven surfaces, (additional) mechanical fixation is required.

Content: 0.5 m² (€27.80* / 1 m²)

From €17.90*
Details

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