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Welcome to the world of AcoustiCork Underlay!

For multi-level residential and commercial environments, impact noise level is a major consideration when timber flooring has been used. In order to minimize the impact noise level and to provide you with a quieter and more comfortable floor, Market Timbers has introduced two types of acoustic underlay manufactured by AMORIM. The AMORIM Group established in 1870 now holds a leading position in the cork industry worldwide. We utilize Cork for its natural resilience and its outstanding acoustic properties.

Cork UnderlayThe recognition of noise as a source of any unwanted, unpleasant or unexpected sound and annoyance began in antiquity. In modern times, noise is also recognized as a serious health hazard.

Noise is disturbing especially when it varies in pitch or has high intensity. Noise often originates from outside sources including traffic, crowds, alarms, horns and sirens. Impact Noise, also called Impact Sound, refers to the type of noise that is generated from within buildings by household activities such as footsteps and appliances such as televisions, radios and washing machines. Impact noise is able to penetrate separating floor structures and has become a major concern for the inhabitants and users of buildings. In existing buildings where impact noise is a problem, any improvement in impact sound insulation will be welcomed, giving relief, comfort and a heightened appreciation for the quality of the living space.

In order to tackle the noise issues in dwelling, it is necessary to have a basic understanding of sound properties. The standard unit to measure noise intensity is decibel (dB) which rises on a logarithmic scale. A 10dB increase is generally perceived as a ‘doubling’ in loudness. The ideal background noise intensity for a room is 35dB and 30dB for sleeping areas. The table below gives the typical decibel level of some example sound sources.


Although sound waves are invisible, when we describe sound waves we always compare them to ripples or water waves that spread out from a single vibrating point. The Building Code of Australia (BCA) considers two types of acoustic transmission:

Airborne transmission: a noise source in one room sends air pressure waves which induce vibration to one side of a wall or element of structure setting it moving such that the other face of the wall vibrates in an adjacent room. The air pressure waves are normally induced by speech, loud music or active systems, and radiate outwards in all directions from the noise source. The airborne noise level is in an inverse proportional relationship with the distance travelled, i.e. the noise attenuates by half if its travelling distance doubles. In modern building industry, good designs can generally ensure that the airborne noise level meets the BCA requirement.

Impact transmission: a noise source in one room results from an impact of an object onto a separating surface, such asa floor and transmits the sound to an adjacent room and to lower dwelling areas. A typical example would be the sound of footsteps in a room being heard in a room below. Acoustic control measures usually include attempts to isolate the source of the impact, or cushioning it. Acoustic underlay now has been a popular option as well as a good practice to reduce the impact noise transmission. In impact transmission, the impact noise can be forced transmitted, direct transmitted or flanking transmitted where the resultant vibrations from a noise source are transmitted to other parts of the building via elements of structure within the building, such as steel frames.

Cork Underlay



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SOUND Insulation

Our range of AcoustiCork Underlay for Timber Flooring Includes:

AcoustiCork T11 – Agglomerated Cork underlay

T11 is constructed from pure raw cork, and comes in a 3mm thickness. Due to the natural acoustic characteristic of cork, T11 is able to reduce the impact noise by 33%.

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AcoustiCork T21 – Agglomerated cork and recycled rubber underlay

T21 uses pure cork and environmentally friendly recycled rubber. It is available in 2mm, 3mm and 5mm thicknesses. T21 has a high density and is able to reduce the impact noise by 25%. Both of our acoustic underlays have high tensile strength and outstanding heat transmission performance.

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The impact noise level in dwelling areas must be controlled to meet the Building Code of Australia (BCA) requirment, so as to minimize the risk of disturbance from external noise sources and internal noise sources. The BCA specifies that the impact noise level in residential and commercial buildings must be less than 62dB. A common method of noise control to meet the BCA is to add a barrier or enclosure and in some cases this may be the only practical solution. Market Timbers AcoustiCork Underlay which is designed by experienced acoustic engineers and tested in various acoustic laboratories, not only meets but also exceeds the BCA requirements. AcoustiCork underlay is able to reduce a significant amount of impact noise level for multi-level residential and commercial buildings where timber flooring is widely used.

Why AMORIM Acoustic Underlays from Market Timbers?

  • Our acoustic underlays have outstanding impact sound insulation performance in residential and commercial floors.
  • Out acoustic underlays not only meet but also exceed the current BCA requirements.
  • They are highly environmentally friendly. They are 100% natural and sustainable products.
  • The acoustic underlays can be installed directly under the final floor, providing high walking comfort with reduced thickness.
  • They have high durability and long term resilience.
  • Out acoustic underlays have excellent thermal conductivity and can be used over a wide service temperature range.
  • They are suitable for flooring systems with hydronic or electrical heating.
  • Out acoustic underlays have outstanding tensile strength, indentation and outstanding recovery ability.