A·kus·tik – Spritz·spach·tel


In german language we call the product: AKUSTIK-SPRITZ-SPACHTEL: A supersmooth acoustic sparkling compound to be applied by spraying. Totally invisable patching repairs, easy to process, easy to renovate.

Patented. Extreme. Makes everything possible.

The most ingenious acoustic plaster of all time.

  • Seamlessly smooth
    • As smooth as a gypsum plaster and similarly resilient.
    • As fine as velvet to the touch.
    • DEKOZELL sets new standards in acoustic plaster with the AKUSTIK-SPRITZSPACHTEL. And enables perfect acoustic ceilings and walls without extra pre-diploma and with minimal manpower–actually impossible in the field of acoustic plasters.
  • Easy to apply
    • We have the patent on what successful acoustic plaster projects really need: One painter alone can coat surfaces of any size. Without surface scaffolding, a roller scaffold is sufficient.
    • Thanks to the extremely long open time, it is possible to take breaks in the middle of the surface at any time, of course without leaving any visible marks. With the color white, you can even pause in the middle of the surface overnight. The next morning, simply continue with a relaxed finish.
  • Invisible repair touch-up
    • Classic acoustic plasters cannot be sanded because they are far too crumbly and sensitive to impact. And they seal themselves with their own sanding dust.
    • DEKOZELL AKUSTIK-SPRITZSPACHTEL can be sanded! Without loss of acoustic performance! It was born for sanding right from the start. This means that any damage can be easily and invisibly repaired locally. Which saves everyone involved a lot of trouble, time and money. 
  • Dust-free renovation
    • So-called acoustic paint seals the pores and sound transparency is immediately lost. Instead of covering dirt with paint, we wipe off dust.
    • Super easy with our virtually dust-free polishing process. The bottom line is that there are huge advantages that hardly any other paint product offers so consistently.
1. Types of utilisation

DIN 18041 (audibility in small and medium-sized rooms) distinguishes between different types of room utilisation. When a room is used for making music, a certain amount of reverberation is desirable so that the room “carries” the sounds. If the room is used for speech, two people can have a reasonable conversation, but if there are many children in the room, the individual sound pressure levels quickly add up again. If a room is used for normal school lessons or as a kindergarten room, the requirements for the amount of sound absorber capacity to be installed are correspondingly higher. However, a compromise often has to be found between the reverberation time to be achieved and the actual structural possibilities.
We would be happy to advise you on this for your specific project, including solutions from other manufacturers.

Overview of the categorisation of types of use


  • Music classroom with active music-making and singing;
  • Council and banqueting hall for musical performances.


  • Courtroom and council chamber
  • Community hall, meeting room
  • Music rehearsal room in music schools or similar
  • Sports hall and swimming pool with an audience


  • Classroom (except for music);
  • Music classroom with audiovisual presentation
  • Group rooms in kindergartens and day care centres, day care centres for the elderly
  • Seminar room, interaction room
  • Lecture theatre
  • Room for tele-teaching
  • Meeting room, conference room
  • Performance room for electro-acoustic use only

Sport 1

  • Sports halls and swimming pools without an audience for normal use and/or single class operation (one class or sports group, standardised communication content)

Sport 2

  • Sports halls and swimming pools without an audience for multiple classes
2. acoustically open window A o.F.

In order to reduce the reverberation time in a room to a certain value, a corresponding amount of so-called “acoustically open window” must be installed. This is an arithmetical auxiliary value that is specified in virtual square metres. A large window front that can be opened completely is an almost sound-reflecting surface when closed. When open, however, precisely this window surface forms an “acoustically open window” from an acoustic point of view – even with an efficiency (sound absorption coefficient) of 100%! In order to reduce the reverberation time in the room to an appropriate level, a corresponding amount of “acoustically open window” must also be installed in the room – strategically distributed throughout the room. The calculation value for the acoustically open window results from the sum of all sound-absorbing surfaces in the room, which have previously been multiplied by their respective sound absorption coefficient. We would be happy to advise you on this for your specific project, including solutions from other manufacturers.

3. Reverberation time T N-set

The reverberation time is the measurement by which you can judge the “reverberation” of a room. If a loud bang is produced in a room (e.g. by clapping your hands vigorously), you can almost count how long it takes for the reverberation to subside if the reverberation time is longer than 1.5 seconds. The eardrum in the human ear has a moment of inertia of approximately 0.7 seconds. Accordingly, reverberation times of more than 0.7 seconds are usually perceived as quite reverberant, while reverberation times of less than 0.7 seconds are much more pleasant. However, the actual target reverberation time for a room depends on its volume and the planned type of use for the room. Please use the acoustics calculator above. We would be happy to advise you on this for your specific property, including solutions from other manufacturers.

Professionally, the reverberation time is determined using appropriate sound pressure level measuring devices that measure the decay of the reverberation in the room. In simpler cases, the sound pressure level required for the measurement is generated by a shot from a shotgun or the bang of a starter flap, such as is used in a 100m race. In professional measurements, which also measure individual frequencies individually, special loudspeakers are set up in the room (so-called dodecahedrons), through which the room is filled with special noise. The decay time of the sound pressure level generated by the noise in the room is then measured. Should such a measurement be necessary, we will be happy to help you find a professional room acoustician.

Acoustic ceilings rethought. And made much better.

Become a master in acoustic plaster.

DEKOZELL really does change everything. Specially developed for the simple spraying of smooth and seamless surfaces, our ACOUSTIC SPRAYING PLASTER opens completely new possibilities. Whether rough or seamlessly smooth, whether brilliant white, deep black or whatever color–DEKOZELL enables a quantum leap in performance and results. If you want a seamless acoustic ceiling, there is only one right choice: DEKOZELL. Other manufacturers may be smiling now. But they have no other choice.

European patent: natural fibres as an air-permeable filler.

Grinding mineral particles produces grinding dust, which seals the pores and seals them acoustically. With DEKOZELL, the sound passes directly through the cellulose fibres. It therefore makes no difference to the cellulose fibre in terms of sound whether it is sanded or not.

A little thought experiment: Let’s take marble grains as a filler in a conventional mineral acoustic coating. Marble cannot let air or sound through. To allow air or sound waves to pass through a marble plaster, only a certain particle size can be used. If you pour a bag of yellow tennis balls into a large glass box, air and sound waves can pass through the spaces between the balls. However, as soon as such a ball is sanded, even this small amount of sanding dust seals the pores between the surrounding balls.

Although sound waves are loud, they do not actually have much energy. They simply cannot get through the mineral dust. As soon as too much binder is placed around the beads, closing the pores between the particles, the sound permeability is also lost. So why not use a filler that is already permeable to air? What others consider impossible; we offer you as standard. Completely natural, simple, ingenious.

100% sandable. 0% acoustic loss.

Sanding is almost dust-free, simply because the light cellulose fibres are sucked away immediately if you do it right. Nothing is sealed, everything stays clean from day 1. DEKOZELL AKUSTIK-SPRITZ-SPACHTEL ensures a more user-friendly future.

Recoat & touch up at any time.

We often hear about projects where the old acoustic ceiling has to be completely torn out due to water damage, for example. With DEKOZELL, things work differently: If the final coating has been used up due to renovation sanding or if a mistake has been made during application, the DEKOZELL ACOUSTIC SPRAY FILLER an be recoated at any time. Directly on the remaining residue of the old coating. In the case of the colour white, only partially in the area of damage–and still invisible in the end.

Let us convince you
and inspire you.


Let us advise you

Talk to our Dekozell specialists. We “only” make seamless acoustic plaster systems, but we do it uniquely well and with enthusiasm. And we go the extra mile for you to find the best solution for your project.

Request a free sample

Only your professional judgement decides. So request your product sample from us and take the Dekozell quality check into your own hands. We will ensure that you receive your sample as quickly as possible.

„As experts for good sound in a room, a pleasant, natural acoustic atmosphere is essential for us. We advise our customers holistically, with the most suitable absorber solutions for the room and customer. Whether using our invisible loudspeakers SONUS INTARA, which can also be easily accessed again, or the impressive 5,000 square meters of wall and ceiling in the Kunst-Museum Reinhardt Ernst. If you want seamless invisibility, we can warmly recommend DEKOZELL.“

Joachim Kistner, Managing Director
SONUS Acoustic Solutions, Baden-Baden

„We develop tools for creative people to optimize spaces such as recording studio control rooms, recording rooms or concert halls. In 2012, we were looking for a seamless acoustic plaster solution for the redesign of control room 7 at ORF Vienna. All of the competing systems could not be repaired and the trickling onto the expensive sound technology was also unacceptable. With DEKOZELL, we have had a capable acoustic plaster partner ever since.“

Peter Willensdorfer, Managing Director
tonarchitektur Willensdorfer, Vienna

„We build atmosphere for our discerning customers. Mainly for high-quality residential buildings. We strive for an aesthetic that emphasizes simplicity. Rough and sensitive acoustic plaster ceilings have always caused us problems. DEKOZELL, on the other hand, is simple, beautiful and smooth. And gives us a new freedom in design.“

Georg Weber, Architect
Hillekamp & Weber Architecture Studio, Mönchengladbach

„We have already worked with almost all acoustic plaster manufacturers. DEKOZELL was a game changer for us. Absolutely invisible repairs and the very special feel of the surface convinced us completely. Today, we have more than 30 people working on the acoustic spray filler and use several spraying machines.“

Jörg Held, Managing Director
Steuernagel & Lampert, Painting company, Groß-Bieberau

„Acoustic plaster is a top priority for me. Because DEKOZELL acoustic plaster systems are usually included in the painting tender, I have already received several villa projects as a complete order. Sanding really does the trick. Difficult installation situations or quick repairs are no problem. I also really like the DEKOZELL sealant for the edge connection, which looks exactly right.“

Peter Rumohr, Master Painter
Malerwerkstätte Rumohr, Krefeld

„We create color concepts and develop extraordinary surfaces with sensitivity and aesthetics surfaces that emphasize uniqueness. Room acoustics are a central theme here. In DEKOZELL, we have found a partner with whom we can meet the high demands of our customers.“

Harald Jehle, Master of Colors
polychrom Jehle, Weingarten

„We have been processing DEKOZELL for many years now. As a two-man business, we can therefore get involved in what is an extremely interesting and lucrative market for us.“

Hermann Kilgus, Master Painter
Kilgus Painting and Varnishing company, Leutkirch

„I was highly skeptical at the beginning. Our customer wanted FLEXOPANEL on the ceiling and on a large wall. We’d never done that before. Through WhatsApp video calls and top work instructions, we grew into it step by step. We are delighted with the result. And so was the customer.“

Enes Zhegerova, Fabricator
Dietrich Plasterer & Color Design, Wüstenrot

DEKOZELL® Acoustic plaster systems

The right system for every project.

The well thought-out variety of our systems enables perfect room acoustics to be seamlessly integrated into all conceivable buildings, halls and rooms. Configure your DEKOZELL acoustic plaster system according to your requirements. If you do not know exactly which system is suitable, we will be happy to help you.

DEKOZELL® System Distance Easy



No hole marking, super easy installation, very good acoustics, with ceiling cavity. Simply more beautiful and discreet hanging.

DEKOZELL® System Flexopanel



Our best-selling system: very flat, light as a feather, uniquely sound absorbing. Simply wallpaper walls and ceilings, even in swimming pools.



Heating & Cooling Ceiling

Turn any GK perforated panel into a seamlessly smooth heating/cooling acoustic ceiling. Even Flying-ball-proof for sports and multi-purpose halls.

DEKOZELL® System Robust



Flying-ball-proof, even for walls: maximum impact resistance, installation depth of up to 5 cm for spotlights and cables, suitable for swimming pools and weathered outdoor areas.

DEKOZELL® System Maxiswing



Anyone who likes mineral wool will get their money’s worth here. The all-rounder for heat and sound insulation. Up to 5 cm installation depth for spotlights and cables, not suitable for swimming pools or external walls.

DEKOZELL® System Moderat



Prime, spray on, done. Inexpensive, possible on very uneven substrates. For revitalised rough surfaces, popular in brutalist architecture such as the industrial look or on unplastered concrete.


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