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Diasen Diathonite Acoustix Plus

20kg Bag (out of stock)

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The calculation is based on spray applying the plaster to a smooth level wall. For hand application with a trowel, add approx. 15% to the estimate below.
m2 of Diasen Diathonite Acoustix Plus
mm thickness
This product is the replacement for Diasen Acoustix
  • Product Overview
  • Technical Details
  • Downloads
  • Installation guide

Product Overview

Main purpose

Noise reduction and sound absorption with additional moisture regulation and thermal benefits.

Use it on

Brick, any type of plaster, concrete, stone, masonry or wood onto external or internal walls, party walls, partition walls and ceilings.


Diathonite Acoustix Plus is a sound absorbing and insulating plaster, formulated with cork, clay, diatomaceous earth and natural hydraulic lime. It is a biologically pure and environmentally sound plaster used for improving the acoustic performance of building facades and external or internal walls.  It can be used to create sound-absorbing acoustic coverings that preventing echo and reduce sound reverberation from hard surfaces.

Where to use it

Diasen's Diathonite Acoustix Plus can be used on practically any surface internally or externally whether to prevent noise transfer between rooms or to reduce external noise nuisance from getting inside, it is a highly versatile product.  

Before you start your project, it is essential to investigate and fix any existing damp or moisture related issues in the wall; please see our installation guide for full details.

All surfaces made from brick, masonry, stone, rough concrete, old plaster and untreated wood can have Acoustix Plus applied.  Smooth concrete and smooth plaster will need Aquabond primer applied first. You may score the surface of smooth plaster instead of using a primer if you prefer.

An adhesion test is recommended for old plasters or treated wood and treated wooden panels before commencing work.  If adhesion is poor, Aquabond primer can be used.

It has been used on concrete barriers of large motorways in Bologna, auditoriums and libraries in Milan Universities and at Brú Na Bóinne visitors centre at the UNESCO world heritage site in Co. Meath Ireland.

What it does & How it works

In addition to its acoustic insulation and sound absorption properties, Diathonite Acoustix Plus has good thermal insulation characteristics and high dehumidifying capacity.  This can help the building owner/occupier reduce energy bills and avoid condensation and mould growth problems.  These benefits and high levels of performance ensure great value for money.

 The unique natural ingredients within Diathonite Acoustix Plus means that when mixed with water it can be applied directly onto surfaces resulting in a joint/gap free sound insulating barrier that performs excellently even at low thicknesses.  It stops reverberation of noise and echo and absorbs up to 70% of the sound waves impacting it.

Why we love it

This plaster is made from completely natural materials like Cork, Diatomaceous earth and  hydraulic lime binders. For environmentally conscious consumers, this is a great choice. Diathonite Acoustix Plus is completely non-toxic and an Environmental Product Declaration is available.  Choosing this plaster can contribute toward up to 43 LEED credits (Leadership in Energy and Environmental Design) which is an environmental certification standard for buildings. With the primary function of the plaster being to reduce noise, it also benefits users looking to reduce energy bills and control moisture within their homes and buildings.  This is due to the good thermal insulation characteristics and high dehumidifying capacity of all its materials.

Diathonite Acoustix Plus can be applied by hand or optimally by a plaster machine over most even or irregular background surfaces.  It’s very easy to follow contours or straighten to right angles and its application will be a similar to that of standard commonly used plasters. Diathonite Acoustix Plus can be applied to walls and ceilings of any kind of shape. The application requires no specialised manpower, no grids, fixing plugs or glue. The final result is an elegant, continuous and seamless surface.


  • A natural acoustic solution
  • Thermal benefits
  • Copes with undulations and design features
  • Fire resistant
  • Natural and environment friendly solution
  • A host of different applications


  • The unique natural ingredients result in a sound insulating barrier that performs excellently even at low thicknesses.
  • Combines the benefits of thermal insulation with sound insulation, helping to improve the comfort of the building.
  • Ideal for round, curved or complex geometric structures.
  • With the best fire resistance class A1, it does not burn or emit smoke.
  • Natural and stable material offers a life-long solution for acoustic and thermal benefits.
  • Its ability to absorb humidity offers an ideal solution for wet areas, such as swimming pools, SPAs and gyms.


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Technical Details

Key Technical Data

Technical Datasheet

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Material Safety Datasheet (MSDS)

  • Download

Environmental Product Declaration (EPD)

  • Download

Declaration of Performance (DOP)

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  • Download
  • Download
  • Download

Brand/Manufacturer Brochure

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Installation Guide

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Before You Start

Before installing any internal wall insulation, it is essential to investigate and fix any existing damp or moisture related issues in the wall. Even though our internal wall systems are breathable and provide optimal protection against condensation, persistent damp issues must be resolved first. A wet wall is a cold wall, so preparation to remove or reduce external sources of moisture is key to achieving optimum results. 

Once damp issues have been resolved, the wall should be allowed to dry thoroughly and re-assessed for suitability of internal wall insulation.

Any existing gypsum plaster on the internal side of the wall should be removed first to reveal the stone or masonry underneath.   This ensures the wall will be fully breathable and allows the Diathonite to work to its full potential.  It also provides a reliable key for maximum adhesion of the Diathonite to the wall.

These are the main considerations before commencing any work:

  • Is there evidence of moisture in the walls?
  • Is there any evidence of condensation, fungus or mould growth on the internal walls?
  • Is there a functioning damp proof course (DPC)?
  • Is there sufficient ventilation in the property?
  • Is the external ground level higher than the floor level inside?
  • Are there any structural defects in the external walls?
  • Is guttering, flashings and external pipework in good condition?
  • Is the external render, pointing or cladding in good condition and providing adequate weather protection?
  • Is the external finish suitable for the severity of wind driven rain exposure?
  • Are the timber joists embedded in external walls free from infestation and rot?
  • Has the building ever been flooded?
  • If you chose not to remove existing plaster on the wall, is this plaster fully compatible with the insulation system being used?  (Ideally, it would need to be lime-based, any existing gypsum plaster on the internal side of the wall should be removed first) 

How to Install

Ecological Building Systems
Diasen Installation Video

Application by hand:

If no primer is being used, the surface must always be wetted before applying the Acoustix plaster especially in the summer or if the wall is exposed to the sun.

The first layer should be applied by trowel to a depth of 15mm.  Subsequent coats can be applied when the plaster appears dryer and has lightened in colour after about 12-24 hours.  When building up the thickness with multiple layers, each layer cannot be more than 25mm thick.  If the total thickness will exceed 60mm, Polites 140 Reinforcing Mesh should be installed once half the thickness is applied. 

When smoothing, do not push or compact the plaster.  You must use a straight edge to level and smooth it.  This preserves the porosity and optimises its acoustic and thermal performance.

For ceiling applications application by plastering machine is essential. Hand application to ceilings is not recommended.

Application by machine

Please see the datasheet for guidelines on spray application by plastering machine.

Polites 140 Reinforcing Mesh
Polites 140 reinforcing mesh

Hints and Tips

All application/yield figures quoted are based on application to a smooth level surface.

Follow the recommended guidance given on the Technical Data Sheet and for large projects its best to contact a trained applicator who can machine apply the plaster. This will ensure a more consistent plaster application in a more efficient manner.

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