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Laboratory tests

Download tests made by the The Labein technology centre, to confirm the good acoustic results of Akustik+Sylomer®.

This centre is officially ENAC-certified and complies with the requirements of the ISO 140-1:1997 standard.

 

Comparative tables of German laboratory ift ROSENHEIM where noise impact and airborne noise of the wooden ceilings with sand and rock wool filling with and without AMC supports are compared.

ift ROSENHEIM
 

Wooden ceiling filled with sand

  • Impact noise
rosenheim

Go to ift ROSENHEIM's report: Original (PDF) and Akustik + Sylomer (PDF)

 

 
  • Airborne noise
rosenheim

Go to ift ROSENHEIM's report: Original (PDF) and Akustik + Sylomer (PDF)

 

 

Wooden ceiling filled with Mineral wool

  • Impact noise
rosenheim

Go to ift ROSENHEIM's report: Original (PDF) and Akustik + Sylomer (PDF)

 

 
  • Airborne noise
rosenheim

Go to ift ROSENHEIM's report: Original (PDF) and Akustik + Sylomer (PDF)

 

 
 

Impact noise level

Ln,w IIC
Floor without floating slab 76dB 34
Floor with floating slab 41dB 69

Airborne noise reduction

Rw STC
Floor without floating slab 58dB 59
Floor with floating slab 72dB 72

RECENT TESTS CARRIED OUT IN IFT ROSENHEIM PROVE THE SUPERIOR IMPACT NOISE ISOLATION OF AKUSTIK+SYLOMER® ACOUSTIC HANGERS AT LOW FREQUENCIES.
 

The test (test X37) is carried out in a ceiling composed of the following elements:

  • 50mm mortar with a weight of 120kg/m².
  • 30mm elastic thermal isolator with a stiffness of 30MN/m³ and a weight of 5,2kg/m².
  • 2x 30mm fibre cement layers with a weight of 89,3kg/m².
  • 22mm chipboard of 13,3kg/m².
  • Timber joists of dimensions 80mm x 220mm.
  • Plenum space of 140mm.
  • Acoustic hangers.
  • Crossed CD profiles.
  • 2x 12,5mm plasterboards of a total weight of 20,6kg/m².

The following curve shows the impact noise curve of Akustik Super T-60 + Sylomer® 30 Type A acoustic hangers according to DIN EN ISO 10140-3.

Different acoustic hangers have also been studied under same conditions, changing only the hangers and in some cases the number and the thickness of plasterboards. The results are summarized below:

Tested solutions Plasterboards Plenum space Acoustic Hangers Ln,w (100Hz - 3150Hz) IIC CI,50-2500 Real impact noise level including low frequencies
1 1x 12,5mm 27mm - 36 dB 74 18 dB 54 dB
2 2x 12,5mm 65mm Competitor’s acoustic hangers 32 dB 78 14 dB 46 dB
3 2x 18mm 65mm Competitor’s acoustic hangers 29 dB 81 15 dB 44 dB
4 2x 12,5mm 40mm - 32 dB 78 19 dB 51 dB
AMC Akustik + Sylomer® 2x 12,5mm 140mm Akustik + Sylomer® acoustic hangers 30 dB 80 10 dB 40 dB


Let’s compare the values of Ln,w, it can be seen that the 3rd solution is getting 29dB, the lowest value of all of them. The influence of low frequencies and the correction coefficients that must be considered for a correct evaluation of impact noise will be discussed later.

Another consideration that should be done is that the hanging mass is 44% higher for the solution 3 against the others that have lower plasterboard thickness and therefore lower mass.

The results are also shown in the graph below:

The solution 3 seems to be the best comparing the Ln,w values for the frequencies from 100Hz to 3150 Hz, but the corrective coefficient for low frequencies CI,50-2500 is showing important differences between the solutions.

Akustik + Sylomer® acoustic products have especially good performance at low frequencies.

Considering the real impact noise level including low frequencies, the best solution is by far the one with Akustik + Sylomer® hangers with 40dB, which is 4dB below the 3rd solution, which was the best without having considered the low frequencies.

Is it important to consider the low frequencies impact noise level from 50 Hz?

Andreas Rabold from IFT Rosenheim carried out an study called “Trittschalldämmung richtig bewerten” to evaluate the correlation between the value of Ln,w according to DIN EN ISO 717-2 and the subjective perception of impact noise on wooden ceilings.

To do this, a measurement carried out with the use of standard impact noise generator (tapping machine) according to DIN EN ISO 140-6 and a measurement of impact noise transmission when walking over the ceiling are compared, as shown in the schematics below:

Ln,w measurement of excitation generated with standard impact noise generator. LAF max,n measurement of excitation generated by walking over the ceiling.


The excitation to measure LAF max,n is generated by walkers with determined attributes and walking in a certain way. The value of LAF max,n is the maximum level measured with A-weighted frequency response and Fast time constant.

The next chart shows the values of each type of test (Ln,w in horizontal axis and LAF max,n in vertical axis) in each type of ceiling. Each point represents the results with a certain ceiling structure.

As it can be seen, the correlation between both test types is weak, as ideally all the points should be laying over a line that represents a good correlation between both tests. Moreover, the subjective perception of noise is in most of the cases lower than the value of Ln,w obtained according to DIN EN ISO 717-2.

The impact noise transmission spectrum of the excitation generated by walking on the ceiling is shown right

This chart explains the reason of the weak correlation between both tests in wooden ceilings. It can clearly be seen that almost all the transmission takes place below 100Hz, while a frequency range between 100Hz and 3150Hz is used to determine the value of Ln,w.

Due to this, it can be concluded that the value Ln,w is not useful to represent cases where frequencies below 100Hz are predominant and that a different evaluation should be used to better represent this case

In order to solve this problem, the correction coefficient CI,50-2500 was established in DIN EN ISO 717-2.

The use of this coefficient shows a much better correlation of the same ceiling structures between the subjective perception LAF max,n and Ln,w + CI,50-2500:

This correction factor allows the use of subjective perception level to determine the target values for good impact noise isolation, having a difference between both values of around 16 dB (A). It also shows the importance of taking the low frequencies into account to measure the impact noise isolation level in wooden ceilings.

Concerning airborne noise isolation, Akustik + Sylomer® hangers have also been tested in two different ceiling structures, one of them (test X38) in the same ceiling structure described above, while in the other (test X40) the mortar is replaced with a fibreboard with a weight of 30,4kg/m2 and only 1x 30mm fibre cement layer is used instead of two. The curves obtained in these tests are shown below:

The values of Rw (Weighted Sound Reduction Index) obtained in each test are summarized in the table below:

Test Rw (100Hz - 3150Hz) STC
X38 82 dB 83
X40 81 dB 82


The original reports mentioned above can be downloaded in the links below:


Akustik + Sylomer® acoustic hangers exceed the class A* recommendation of the German Acoustic Society DEGA.

LINK


Downloads Original Translation
X37 LINK LINK
X38 LINK LINK
X40 LINK LINK
A. Rabold - Trittschalldämmung richtig bewerten LINK LINK
Schallschutz im Holzbau - Grundlagen und Vorbemessung LINK LINK
Schalltechnische Optimierung von Unterdeckenabhängern LINK LINK
The patented steel subfloor system has damping elements for effective impact sound reduction and airborne sound insulation.
 
Downloads
Acoustic testing of impact sound insulation LINK
Acoustic tests of airborne sound insulation LINK

GRANABGOLV and KL-ROMS.

SOUND-PROOFING. MEASUREMENTS.

LINK
Dumbbell thrown test Audiotec
 
Downloads
Dumbbell thrown test Audiotec LINK
Audiotec Akustik Floor Mount
 

According to the results obtained from different acoustic tests carried out at an external laboratory, the Akustik + Sylomer®Floor Mounts offer a high reduction of impact noise (up to 30 dB):

AKUSTIK + SYLOMER® FLOOR MOUNT 25 WITH RIGIDUR 20MM + RIGIDUR HBR 13 mm

Go to the Impact Noise test report (PDF)

Go to the Airborne Noise test report (PDF)

AKUSTIK + SYLOMER® FLOOR MOUNT 25 WITH OSB BOARD OF 22 mm

Go to the Impact Noise test report (PDF)

Go to the Airborne Noise test report (PDF)

AKUSTIK + SYLOMER® FLOOR MOUNT 30 WITH OSB BOARD OF 22 mm

Go to the Impact Noise test report (PDF)

Go to the Airborne Noise test report (PDF)

Anex.
Impact Noise Test | Low Freq Results (PDF)
Airborne Noise Test | Low Freq Results (PDF)

Airborne Noise test results Rw STC
Akustik Floor Mount 25 + Rigidur 20 mm + Rigidur HBR 13 mm 71 dB 74
Akustik Floor Mount 25 + OSB Board 22 mm 67 dB 72
Akustik Floor Mount 30 + OSB Board 22 mm 66 dB 71

Impact Noise test results Ln,w IIC
Akustik Floor Mount 25 + Rigidur 20 mm + Rigidur HBR 13 mm 40 dB 70
Akustik Floor Mount 25 + Tablero OSB 22 mm 47 dB 63
Akustik Floor Mount 30 + Tablero OSB 22 mm 50 dB 60
Itecons EP + Sylomer®
 

The new results obtained during the tests carried out by an external laboratory show the multiple advantages of using the EP + Sylomer® wall ties and wall mounts, compared with a conventional masonry wall.

In the new airborne tests carried out by an external laboratory (Itecons - Institute for Research and Technological Development for Construction, Energy, Environment and Sustainability) the results have been compared between a conventional masonry wall and a wall installed with AMC-MECANOCAUCHO® EP + Sylomer® Acoustic Wall Ties and Wall mounts.

The test is performed in a controlled laboratory, in accordance with the ISO 10140-2:2010 standard, by the following procedure:

  • Measurement of the sound pressure level in the source room.

  • Simultaneous sound pressure level measurement in the receiving room.

  • Measurement of the background noise in the receiving room.

For each test the following test specimen has been used, this is composed of a masonry brick wall (bricks with individual dimensions of 300 mm x 200 mm x 150 mm) plastered on both sides (thickness of approximately 15 mm, each side). An acoustical lining on the inner face is constructed with the following elements:

  • EP 700 + Sylomer® Wall ties, fixed with bushings and screws to the basic element (air space of approximately 100 mm).

  • Metal structure filled with low density mineral wool (nominal thickness of 50 mm) formed by aluminum profiles with thickness of 48 mm and fixed to the EP700 + Sylomer® supports with screws.

  • EP 500 + Sylomer® wall mounts under the metal structure.

  • One layer of plasterboard with nominal thickness of 12,5 mm and nominal surface mass of 8,0 kg/m² fixed with screws to the metal structure.

  • One layer of elastic polymer and minerals with double anti-cracking layer by traction with nominal thickness of 3 mm (ref. “dBimpact Ceracoustic 3.0”).

  • One layer of plasterboard with nominal thickness of 15 mm and nominal surface mass of 10,9 kg/m².

  • The joints of the plasterboard layers are covered with plaster filler and the layers of plasterboard are peripherally detached from the test rim with acoustic band.

1.jpg
Construction details.

2.png
Installation of the EP + Sylomer® mounts on the wall.

You can also find more information regarding the installation of our EP + Sylomer® wall ties and wall mounts in the following link of our website:

https://www.akustik.com/en-GB/installation-instructions/

According to the tests results obtained, the wall installed with the EP+Sylomer® Wall Ties and Wall Mounts increases the airborne noise reduction to up to 35dB, compared with the standard masonry wall.

Go to the Original test report (PDF)

Airborne Noise test results Rw STC
Wall with EP + Sylomer® mounts 69 dB 70
Audiotec - Light Timber Structures
 

LABORATORY TEST RESULTS FOR LIGHT WOOD STRUCTURES

INTRODUCTION

A newly built or renovated building must comply with acoustic requirements depending on the country they are built in or the acoustic demands they must fulfil. These are put in place to give an improved living quality of their owners and prevents them being disturbed by problematic noisy neighbours.

Depending on the country, the quantity of wooden structure buildings may be important, especially those ones placed in the historic side of the city. They usually are light buildings that have limitations regarding the amount of load their structure can withstand, so the acoustic isolation solution cannot incorporate heavy concrete based solutions as floating floors. In these cases we have to give priority to dry construction solutions.

Achieving good noise insulation values with light structures is often a challenge. The transmission of noise through a rigid structures (structure borne noise) in these type of buildings plays a major role. In order to find easy constructive methods with the lowest cost-factor, AMC Mecanocaucho® has been working together with acoustic labs in order to obtain test results that can meet the acoustic demands of the most demanding countries.

This article shows the tests results for floating floor and hanging ceiling installations for light wooden structures, compared to a solution without isolation elements. Tests have been carried out using different solutions, either on the floor suspension, on the ceiling or combining both systems.

THE PRODUCTS THAT HAVE BEEN TESTED ARE:

AKUSTIK + SYLOMER FLOOR MOUNTS

The Akustik + Sylomer® floor mounts are anti vibration mounts that have been designed for the installation of wooden floors with a batten system. Their easy installation and low space requirement allows exceptional vibration and noise isolation as part of a floating floor application.

These mounts are typically installed every 0.5 meters. But this feature may be tuned in order to adapt to the load or natural frequency requirement of the application. The natural frequency at their optimal loading point reaches values below 12 Hz. These technical properties provide a high level of noise and vibration isolation when used in light wooden structures.

AKUSTIK SUPER + SYLOMER® T-60

The Akustik Super + Sylomer® T-60 acoustic hangers have been designed to suit a standard furring channel profile. The are a specially designed profile which allows the metal channel to simply be pushed in to place, this provides a quick and easy installation. Once secured with screws this system gives exceptional vibration and noise isolation as part of an acoustic ceiling installation.

The Akustik + Sylomer® hangers are manufactured in four special mixes of Sylomer® to adapt better to the load of each application. The natural frequency at their optimal loading point can reach values below 7 Hz. These technical properties also provide a high level of noise and vibration isolation when used in light wooden structures.

Acoustic-hangers

RESULTS OF THE LABORATORY TESTS

In order to show the acoustic advantages when using Akustik+Sylomer® Floor mounts and Akustik + Sylomer® Super T60 acoustic hangers in a light wood construction, an independent external technological center has performed impact and airborne noise tests using different configurations in light wooden structures.

Based on the obtained test results,an airborne noise reduction up to 26dB and impact noise reduction up to 32dB can be obtained, compared to the reference configuration, without any Akustik + Sylomer® mount and any Akustik hanger.

The tested configurations are shown below:

Reference configuration

Scheme Description
light_slab_22mm
  • 22mm Chipboard
  • 120x180 mm section wooden beams (100mm mineral wool between)
  • 24 mm wooden battens
  • Plasterboard
Impact noise results - calculated according to

ISO 717-2: 2013
Airbone noise results - calculated according to

ISO 717-1: 2013
Impact_noise Airborne_noise
Go to the Impact Noise test report (PDF) Go to the Airborne Noise test report (PDF)

System 1

Scheme Description
light_slab_22mm_system1
  • 22mm OSB
  • 50mm wooden battens (45mm mineral wool between battens)
  • Akustik + Sylomer® floor mount 25
  • 22mm Chipboard
  • 120x180 mm section wooden beams (100mm mineral wool between)
  • 24mm wooden battens
  • Plasterboard
Impact noise results - calculated according to

ISO 717-2: 2013
Airbone noise results - calculated according to

ISO 717-1: 2013
Impact_noise_system1 Airborne_noise_system1
Go to the Impact Noise test report (PDF) Go to the Airborne Noise test report (PDF)

System 2

Scheme Description
light_slab_22mm_system2
  • Rigidur plate H13 BR - 13mm (cement board)
  • Rigidur 20mm
  • 50mm wooden battens (Mineral wool between battens)
  • Akustik + Sylomer® floor mount 25
  • 22mm Chipboard
  • 120x180 mm section wooden beams (100mm mineral wool between)
  • 24 mm wooden battens + 1 gypsum board
Impact noise results - calculated according to

ISO 717-2: 2013
Airbone noise results - calculated according to

ISO 717-1: 2013
Impact_noise_system2 Airborne_noise_system2
Go to the Impact Noise test report (PDF) Go to the Airborne Noise test report (PDF)

System 3

Scheme Description
light_slab_22mm_system3
  • Rigidur plate H13 BR - 13mm (cement board)
  • Rigidur 20mm
  • 50mm wooden battens (Mineral wool between battens)
  • Akustik + Sylomer® floor mount 25
  • 22mm Chipboard
  • 120x180 mm section wooden beams (100mm mineral wool between)
  • 24 mm wooden battens + 1 gypsum board
  • Akustik + Sylomer Super T60 hangers with a 280 mm plenum (90mm of mineral wool)
  • 2 laminated 12,5 mm thick plasterboard
Impact noise results - calculated according to

ISO 717-2: 2013
Airbone noise results - calculated according to

ISO 717-1: 2013
Impact_noise_system3 Airborne_noise_system3
Go to the Impact Noise test report (PDF) Go to the Airborne Noise test report (PDF)

System 4

Scheme Description
light_slab_22mm_system4
  • 22mm Chipboard
  • 120x180 mm section wooden beams (100mm mineral wool between)
  • 24 mm wooden battens + 1 gypsum board
  • Akustik + Sylomer Super T47 hangers with a 280 mm plenum (90mm of mineral wool)
  • 2 laminated 12,5 mm thick plasterboard
Impact noise results - calculated according to

ISO 717-2: 2013
Airbone noise results - calculated according to

ISO 717-1: 2013
Impact_noise_system4 Airborne_noise_system4
Go to the Impact Noise test report (PDF) Go to the Airborne Noise test report (PDF)

Overview

Impact noise results - calculated according to

ISO 717-2: 2013
Airbone noise results - calculated according to

ISO 717-1: 2013
Impact_noise_system4.2 Airborne_noise_system4.2

Do not hesitate to contact our application engineers for more information on this product.

ift ROSENHEIM - Rigid vs. Elastic systems for ceilings
 

DIFFERENCES AT LOW FREQUENCIES (50HZ-100HZ) BETWEEN RIGIDLY INSTALLED CEILINGS VS ELASTICALLY SUSPENDED CEILINGS

INTRODUCTION

In many buildings we can observe rigidly suspended ceiling solutions, this solution is however a pathway for the transmission of structural noise. An elastic solution can significantly reduce noise transmission, to demonstrate this AMC Mecanocaucho® has been working together with acoustic laboratories to obtain test results showing the effectiveness of elastic solutions versus rigid solutions.

This article compares the results of the tests of a suspended ceiling using a rigid solution versus an elastic solution in two configurations with the same construction conditions for light wooden structures.

THE PRODUCTS TESTED ARE THE FOLLOWING:

To begin with a suspended ceiling with rigid Nonius fixings was tested and then the same suspended ceiling was tested with the Akustik 1 + Sylomer® support with the Nonius fixation, also called Akustik 1 Nonius + Sylomer®.

Akustik 1 Nonius + Sylomer® acoustic hangers have been conceived for the suspension of acoustic false ceilings, vibrating pipes and machinery that must be suspended. The outstanding properties of Sylomer® microcellular polyurethane achieve excellent insulation values compared to other substrates that use rubber or cork or a combination of both.

These anti vibration mounts are manufactured in three special Sylomer® mixtures to better adapt to the load of each application. A wide variety of fixing elements facilitate their installation and are better adapted to each type of work. Their robust metal parts resist tensile loads of 650 to 1000 Kg and are supplied with an anticorrosive treatment capable of withstanding the most demanding environments.

The natural frequency at its optimal load point can reach values below 8 Hz. These technical properties also provide a high level of noise and vibration isolation when used in lightweight wooden structures.

RESULTS OF LABORATORY TESTS

To demonstrate the benefits of acoustic insulation in light wooden structures by using elastic acoustic hangers, an independent external laboratory has carried out different tests for airborne noise and impact noise, using two constructive configurations in light wooden structures.

Analysing the results over the entire frequency range (50-5000Hz), it can be observed that a reduction of impact noise of 4 to 5dB (Ln, w) is obtained with the elastic solution. An airborne noise reduction of 3 to 4dB (Rw) is achieved, always comparing both constructive configurations.

If we focus on the low frequencies (50-100Hz), an impact noise reduction of 1 to 6dB is obtained with the elastic solution, while for airborne noise the reduction obtained is 2 to 6dB. As in the previous case, always comparing both constructive configurations.

Taking into account that the elastic solution has been tested with a 400mm plenum, while the rigid solution has been tested with a 430mm plenum, we can conclude that the elastic solution has been tested under worse acoustic conditions. Even so, the values obtained are better with the elastic solution.

The configurations tested can be seen below:

CONSTRUCTION SYSTEM 1

Scheme Description
light_slab_22mm

RIGID SOLUTION

  • 22mm Chipboard
  • 80x220 mm section wooden beams (with 100mm mineral wool interleaved)
  • Nonius Rigid Fixation - 210mm
  • Plasterboard
  • * Plenum: 430mm

light_slab_22mm

ELASTIC SOLUTION

  • 22mm Chipboard
  • 80x220 mm section wooden beams (with 100mm mineral wool interleaved)
  • Akustik 1 Nonius + Sylomer® Binding - 180mm
  • Plasterboard

* Plenum: 400mm

Impact noise results - calculated according to Standard

ISO 10140-3
Airborne noise results - calculated according to Standard

ISO 10140-2
Impact_noise Airborne_noise
Impact_noise Airborne_noise
Impact_noise Airborne_noise
Go to the Impact Noise Results Report (PDF) - Nonius Fixation Go to the Airborne Noise Results Report (PDF) - Nonius Fixation
Go to the Impact Noise Results Report (PDF) - Akustik 1 Nonius + Sylomer® Go to the Airborne Noise Results Report (PDF) - Akustik 1 Nonius + Sylomer®

CONSTRUCTION SYSTEM 2

Scheme Description
light_slab_22mm

RIGID SOLUTION

  • 65mm fibreboard
  • 22mm chipboard
  • 80x220 mm section wooden beams (with 100mm mineral wool interleaved)
  • Nonius Rigid Fixation - 210mm
  • Plasterboard
  • * Plenum: 430mm

light_slab_22mm

ELASTIC SOLUTION

  • 65mm fibreboard
  • 22mm chipboard
  • 80x220 mm section wooden beams (with 100mm mineral wool interleaved)
  • Akustik 1 Nonius + Sylomer® Binding - 180mm
  • Plasterboard
  • * Plenum: 400mm

Impact noise results - calculated according to Standard

ISO 10140-3
Airborne noise results - calculated according to Standard

ISO 10140-2
Impact_noise Airborne_noise
IFT-graph. Airborne_noise
Impact_noise Airborne_noise
Go to the Impact Noise Results Report (PDF) - Nonius Fixation Go to the Airborne Noise Results Report (PDF) - Nonius Fixation
Go to the Impact Noise Results Report (PDF) - Akustik 1 Nonius + Sylomer® Go to the Airborne Noise Results Report (PDF) - Akustik 1 Nonius + Sylomer®


Do not hesitate to contact our technical department. They can help you to make vibration calculations using this new anti vibration mount.

Dowel-Laminated Timber (DLT) structures
 

LABORATORY TEST RESULTS WITH THE AKUSTIK + SYLOMER MOUNTS IN DOWEL-LAMINATED TIMBER (DLT) STRUCTURES

INTRODUCTION

Dowel-Laminated Timber (DLT) structures are similar to Nail-Laminated Timber (NLT) structures but without the need for nails or metal fasteners. Dowel-Laminated panels are an all-wood structure and can be easily processed using CNC machinery, allowing on site modifications.

Different tests have been carried out using different solutions for the floating floor from a naked structure to an installation with several cement board layers with our floating mounts.

THE PRODUCTS THAT HAVE BEEN TESTED ARE:

AKUSTIK + SYLOMER FLOOR MOUNTS

The Akustik + Sylomer® Floor mounts are anti vibration mounts that have been designed for the installation of wooden floors with a batten system. Their easy installation and low space requirement allows exceptional vibration and noise isolation as part of a floating floor application.

These mounts are typically installed every 0.5 meters. But this feature may be tuned in order to adapt to the load or natural frequency requirement of the application. The natural frequency at their optimal loading point reaches values below 12 Hz. These technical properties provide a high level of noise and vibration isolation when used in light wooden structures.

RESULTS OF THE LABORATORY TESTS

In order to show the acoustic advantages when using Akustik+Sylomer® Floor mounts in a Dowel-Laminated Timber structure, an independent external technological centre has performed impact noise tests using different building configurations.

Based on the obtained test results, an impact noise reduction up to 26dB can be obtained, compared to the reference configuration, without any Akustik+Sylomer® Floor mount

The tested configurations are shown below as well as different comparisons between different configuration systems:

System A1

Scheme Impact noise results - calculated according to Standard ASTM E1007
A1 System A1
Description
  • DLT floor 151 mm (140 mm DLT +11 mm OSB)
Go to the Impact Noise Results Report (PDF)

System A2

Scheme Impact noise results - calculated according to Standard ASTM E1007
light_slab_22mm System A2
Description
  • DLT floor 151 mm (140 mm DLT +11 mm OSB)
  • 50mm wooden battens
  • Akustik + Sylomer® floor mount 25
  • 8 mm OSB

Go to the Impact Noise Results Report (PDF)

System A3

Scheme Impact noise results - calculated according to Standard ASTM E1007
A3 System A3
Description
  • DLT floor 151 mm (140 mm DLT +11 mm OSB)
  • 50mm wooden battens
  • Akustik + Sylomer® floor mount 25
  • 89mm Rockwool insulation
  • 8 mm OSB

Go to the Impact Noise Results Report (PDF)

System A4

Scheme Impact noise results - calculated according to Standard ASTM E1007
A4 System A4
Description
  • DLT floor 151 mm (140 mm DLT +11 mm OSB)
  • 50mm wooden battens
  • Akustik + Sylomer® floor mount 25
  • 89mm Rockwool insulation
  • 1 layer cement board

Go to the Impact Noise Results Report (PDF)

System A5

Scheme Impact noise results - calculated according to Standard ASTM E1007
A5 System A5
Description
  • DLT floor 151 mm (140 mm DLT +11 mm OSB)
  • 50mm wooden battens
  • Akustik + Sylomer® floor mount 25
  • 89mm Rockwool insulation
  • 2 layer cement board

Go to the Impact Noise Results Report (PDF)

System A6

Scheme Impact noise results - calculated according to Standard ASTM E1007
A6 System A6
Description
  • DLT floor 151 mm (140 mm DLT +11 mm OSB)
  • 50mm wooden battens
  • Akustik + Sylomer® floor mount 25
  • 89mm Rockwool insulation
  • 3 layer cement board

Go to the Impact Noise Results Report (PDF)

System A7

Scheme Impact noise results - calculated according to Standard ASTM E1007
A7 System A7
Description
  • DLT floor 151 mm (140 mm DLT +11 mm OSB)
  • 50mm wooden battens
  • Akustik + Sylomer® floor mount 25
  • 89mm Rockwool insulation
  • 2 layer cement board
  • 11mm laminated floor

Go to the Impact Noise Results Report (PDF)

System A8

Scheme Impact noise results - calculated according to Standard ASTM E1007
A8 System A8
Description
  • DLT floor 151 mm (140 mm DLT +11 mm OSB)
  • 50mm wooden battens
  • Akustik + Sylomer® floor mount 25
  • 89mm Rockwool insulation
  • 38 mm, normal strength concrete topping

Go to the Impact Noise Results Report (PDF)

OVERVIEW

Influence of the Rockwool installation Impact noise results - calculated according to Standard ASTM E1007 Comparation between different layers of the Cement Board Impact noise results - calculated according to Standard ASTM E1007
Influence Rockwool Comparation Cementboard
Influence of the laminated floor Impact noise results - calculated according to Standard ASTM E1007 Comparation between the Cement Board layers and the Concrete Topping Impact noise results - calculated according to Standard ASTM E1007
Influence Laminated floor Comparation Cementboard
Overview Impact noise results - calculated according to Standard ASTM E1007
Overview Impact noise results
Akustik + Sylomer Floor Mounts in CLT structures
 

LABORATORY TEST RESULTS FOR THE AKUSTIK + SYLOMER FLOOR MOUNTS IN CLT STRUCTURES

This article shows the tests results for floating floor installations when used in Cross-Laminated Timber (CLT) structures, comparing them to the results of the bare CLT structure.

INTRODUCTION

Cross-Laminated Timber (CLT) structures are made of layers of timber boards that are glued to each other. The boards of each layer are oriented perpendicular to adjacent layers so similar structural properties can be obtained in both directions.

In general, timber structures are harder to acoustically isolate due to their lower mass compared to concrete structures. Due to this, the proper selection of acoustic insulation products becomes more critical.

Different tests have been carried out using different solutions for the floating floor from a bare CLT structure to an installation with several fibreboard layers with our floating mounts.

THE PRODUCTS THAT HAVE BEEN TESTED ARE:

AKUSTIK + SYLOMER FLOOR MOUNTS

The Akustik + Sylomer® Floor mounts are anti vibration mounts that have been designed for the installation of wooden floors with a batten system. Their easy installation and low space requirement allow exceptional vibration and noise isolation as part of a floating floor application.

These mounts are typically installed every 0,5 meters. But this feature may be tuned to adapt to the load or natural frequency requirement of the application. The natural frequency at their optimal loading point reaches values below 12 Hz. These technical properties provide a high level of noise and vibration isolation when used in light wooden structures.

RESULTS OF THE LABORATORY TESTS

In order to show the acoustic advantages when using Akustik+Sylomer® Floor mounts in a Cross-Laminated Timber structure, impact noise and airborne noise tests are carried out with different configurations:

Bare CLT A1
  • 1. CLT 140 5s by Stora Enso
Floating Floor Variant 1 A1
  • 1. Gypsum fibreboard screed, Rigidur 25
  • 2. OSB Board 22mm
  • 3. Wooden battens 50x60mm
  • 4. Insulation, Mineral Wool
  • 5. Akustik+Sylomer® Floor Mount 25
  • 6. CLT 140 5s by Stora Enso
Floating Floor Variant 2 A1
  • 1. Gypsum fibreboard screed, Rigidur 12,5
  • 2. Gypsum fibreboard screed, Rigidur 25
  • 3. OSB Board 22mm
  • 4. Wooden battens 50x60mm
  • 5. Insulation, Mineral Wool
  • 6. Akustik+Sylomer® Floor Mount 25
  • 7. CLT 140 5s by Stora Enso

   

This way, the acoustic performance of a floating floor suspended on Akustik + Sylomer® Floor Mounts can be compared to a bare CLT structure without floating floor.

The results of the acoustic tests with each configuration are shown below:

BARE CLT
clt
  • 1. CLT 140 5s by Stora Enso
Impact noise results - calculated according to ISO 10140-3: 2021 Airborne noise results - calculated according to ISO 10140-2: 2021
g1 g1
Ln,w: 90 dB IIC 20 Rw: 37 dB STC 37
   

VARIANT 1
v2
  • 1. Gypsum fibreboard screed, Rigidur 25
  • 2. OSB Board 22mm
  • 3. Wooden battens 50x60mm
  • 4. Insulation, Mineral Wool
  • 5. Akustik+Sylomer® Floor Mount 25
  • 6. CLT 140 5s by Stora Enso
Impact noise results - calculated according to ISO 10140-3: 2021 Airborne noise results - calculated according to ISO 10140-2: 2021
g2 air2
Ln,w: 49 dB IIC 61 Rw: 63 dB STC 64
Go to the Impact Noise Report(PDF) Go to the Airborne Noise Report(PDF)
Estimated natural frequency: 16,5Hz
   

VARIANT 2
A1
  • 1. Gypsum fibreboard screed, Rigidur 12,5
  • 2. Gypsum fibreboard screed, Rigidur 25
  • 3. OSB Board 22mm
  • 4. Wooden battens 50x60mm
  • 5. Insulation, Mineral Wool
  • 6. Akustik+Sylomer® Floor Mount 25
  • 7. CLT 140 5s by Stora Enso
Impact noise results - calculated according to ISO 10140-3: 2021 Airborne noise results - calculated according to ISO 10140-2: 2021
imp airb
Ln,w: 46 dB IIC 64 Rw: 64 dB STC 64
Go to the Impact Noise Report(PDF) Go to the Airborne Noise Report(PDF)
Estimated natural frequency: 14,2Hz
   

OVERVIEW
graph graph
Go to the Report(PDF)
   

These results clearly show how the noise insulation can be improved in CLT structures by using floating floors suspended on Akustik + Sylomer® Floor Mounts.

The use of Akustik + Sylomer® Floor Mounts allows an improvement in impact noise level between 41dB and 44dB, while the improvement in airborne noise is 26dB to 27dB, depending on the tested floor variant.

The difference is particularly noticeable at high frequencies, in which a difference up to 55dB in impact noise and up to 39dB in airborne noise can be seen.

These results show how effectively a CLT structure can be acoustically isolated by implementing a floating floor suspended on Akustik + Sylomer® Floor mounts.

Do not hesitate to contact our application engineers for more information on this product.