DIATHONITE® ACOUSTIX+
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Catalog excerpts

DIATHONITE® ACOUSTIX+ - 1

NATURAL CORK-BASED PLASTER FOR ACOUSTIC COMFORT

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CORK AND ITS SOUND INSULATION PROPERTIES

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The signs of acoustic comfort The insulation properties of cork The virtues of sound-absorption Sound insulation: the transmitted wave The horizons of the regulation Material performance Diathonite Acoustix+ absorption coefficient Sound insulation parameters Fields of application Application methods Beyond sound insulation Sound insulation systems Case studies 1

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THE SIGNS OF ACOUSTIC COMFORT We experience the world through our senses. They make us relate with others and give us a face and an identity. Hearing allows us to connect to the world. It is the first sense that develops in the foetus, a primordial faculty that regulates our interactions with the world. We draw energy and pleasure from listening to good music, talking, seeing a stage play, provided that acoustic conditions are optimal, when noise and disturbance are limited. Noise is a challenge for acoustic comfort, which is an essential element for the quality of life. That’s why it must...

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THE INSULATION PROPERTIES OF CORK Cork is the bark of a Mediterranean oak tree. A bark that looks similar to the others but with unique characteristics that make it different. Cork is the result of nature’s creative flair. The more in-depth you go, the closer you get to the millions of alveoli that make up the structure, the more you understand its peculiarity. The single cells of this immense and tidy hive embed a large amount of air, making the bark extremely light, elastic and breathable. 4

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Air is an excellent sound conductor. However, sound tends to disperse when it’s embedded into the cavities of a porous body. In this case, the material acquires sound insulation properties. DIASEN HAS MADE THE MOST OF THESE PROPERTIES CREATING DIATHONITE ACOUSTIX+, the environmentally-friendly cork-based plaster that enhances the sound-absorption properties of surfaces and the sound insulation of façades, walls and partitions. A flagship for housing comfort.

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Diathonite Acoustix+ is an original type of plaster resulting from experimental research. The aim was to develop a unique product that could enhance the sound performance of spaces that need high sound-absorption levels, such as music venues, theaters, schools, offices and restaurants. REFLECTED WAVE

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SOUND ABSORPTION Sound absorption describes the ability of a material to absorb the energy of sound waves without reflecting it but transforming it into heat. Sound Absorbing Material TRANSMITTED WAVE When a sound wave hits a surface, a portion of it is reflected, another portion is absorbed and dissipated into the surface and a third portion is transmitted through the construction element. The sound-absorption level of a material is given by its ability to absorb and not reflect the incident sound wave. Reverberation – the vibration and echoing effect resulting from multiple sound...

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SOUND INSULATION: THE TRANSMITTED WAVE A high sound insulation level limits the transmission of a sound wave from one room to another, from the inside to the outside and vice-versa. That’s why, sound-insulation materials are ideal for walls and partitions of condos, where noise can often be a serious problem for the residents. TO ENHANCE SOUND INSULATION IN A BUILDING, IT IS ESSENTIAL TO REDUCE THE TRANSMITTED SOUND WAVE: THE AMOUNT OF INCIDENTAL RADIATION THAT PENETRATES THE MATERIAL BUT IT IS NEITHER ABSORBED NOR REFLECTED.

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PROPERTIES The challenge is to improve sound insulation while preserving the sound-absorption inclination of the material. In order to achieve this combination, we increase the level of absorption and dissipation of the sound wave within the material. That’s why porosity is so important to find a fair compromise with the other characteristics of the material. 9

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THE HORIZONS OF THE REGULATION Acoustic standards differ from country to country and there is no shared view worldwide. For this reason, the International Organization for Standardization (ISO) has decided to adopt a universal standard with the aim of standardizing the guidelines relating to acoustics. In this regard, the organization has defined the acoustic classification criteria for dwellings and the relative procedures to be followed: ISO 19488 - Acoustic classification of dwellings. The regulations in force in Europe implement DIRECTIVE 2002/49/EC dated 25 June 2002 relating to the...

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MATERIAL PERFORMANCE One product alone cannot ensure excellent sound-absorption and sound insulation performances. That’s why you need different materials with specific properties.

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DIATHONITE ACOUSTIX+ IS DESIGNED TO PROVIDE BOTH SOUND ABSORPTION AND SOUND INSULATION. Research on raw materials and experimentations have allowed us to formulate a premixed plaster with the following characteristics: 1. a high level of porosity of the raw materials, starting from cork, to improve sound absorption 2. the presence of lime which acts as a binder giving the material a solidity that optimizes sound insulation.

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DIATHONITE ACOUSTIX+ ABSORPTION COEFFICIENT The sound absorption performance of Diathonite Acoustix+ has been validated by acoustic tests, which show the variation in the absorption coefficients ranging between 0 and 1 - in a scale of frequencies (Hz). The graph shows a sequence of values that highlight how absorption always exceeds 70% in the speech frequency range (from 500 to 2000 Hz). This means that the share of the incident sound wave that is reflected is less than 30%, an acoustic absorption value considered to be of a high level of performance. 14

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SOUND-ABSORPTION VALUES AND PERFORMANCE The results shown in the graph, that crosses frequency and absorption, can be summarized using some parameters that use single values to evaluate the acoustic performance of materials. These values are indicated in the following table. DIATHONITE ACOUSTIX+ RESULT NRC (Noise Reduction Coefficient) NRC is the average between 250Hz, 500Hz, 1000Hz and 2000Hz, it describes the sound absorption performance of a material. SAA (Sound Absorption Average) The Sound Absorption Average (SAA) is the average sound absorption coefficient ranging between 200 and 2500...

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