Laboratory tests

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:

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:

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

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)

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.

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)

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.

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
	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
Go to the Impact Noise test report (PDF)	Go to the Airborne Noise test report (PDF)

System 1

Scheme	Description
	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
Go to the Impact Noise test report (PDF)	Go to the Airborne Noise test report (PDF)

System 2

Scheme	Description
	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
Go to the Impact Noise test report (PDF)	Go to the Airborne Noise test report (PDF)

System 3

Scheme	Description
	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
Go to the Impact Noise test report (PDF)	Go to the Airborne Noise test report (PDF)

System 4

Scheme	Description
	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
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

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

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 air gap, while the rigid solution has been tested with a 430mm air gap, 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
	RIGID SOLUTION 22mm Chipboard 80x220 mm section wooden beams (with 100mm mineral wool interleaved) Nonius Rigid Fixation - 210mm Plasterboard * Air gap: 430mm
	ELASTIC SOLUTION 22mm Chipboard 80x220 mm section wooden beams (with 100mm mineral wool interleaved) Akustik 1 Nonius + Sylomer® - 180mm Plasterboard * Air gap: 400mm
Impact noise results - calculated according to Standard ISO 10140-3	Airborne noise results - calculated according to Standard ISO 10140-2
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
	RIGID SOLUTION 65mm fibreboard 22mm chipboard 80x220 mm section wooden beams (with 100mm mineral wool interleaved) Nonius Rigid Fixation - 210mm Plasterboard * Air gap: 430mm
	ELASTIC SOLUTION 65mm fibreboard 22mm chipboard 80x220 mm section wooden beams (with 100mm mineral wool interleaved) Akustik 1 Nonius + Sylomer® - 180mm Plasterboard * Air gap: 400mm
Impact noise results - calculated according to Standard ISO 10140-3	Airborne noise results - calculated according to Standard ISO 10140-2
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 3

Scheme	Description
	REFERENCE Concrete Slab 140 mm
	RIGID SOLUTION Concrete Slab 140mm RockWool 100 mm Rigid Fixation Metal Profile Plasterboard 2x13mm * Air gap: 100mm
	RUBBER SOLUTION Concrete Slab 140mm RockWool 100 mm Rubber Fixation Metal Profile Plasterboard 2x13mm * Air gap: 100mm
	SYLOMER SOLUTION Concrete Slab 140mm RockWool 100 mm Akustik+Syomer® Metal Profile Plasterboard 2x13mm * Air gap: 130mm
Impact noise results - calculated according to Standard ISO 10140-3	Airborne noise results - calculated according to Standard ISO 10140-2
Go to the Impact Noise Results Report (PDF) - REFERENCE	Go to the Airborne Noise Results Report (PDF) - REFERENCE
Go to the Impact Noise Results Report (PDF) - RIGID SOLUTION	Go to the Airborne Noise Results Report (PDF) - RIGID SOLUTION
Go to the Impact Noise Results Report (PDF) - RUBBER SOLUTION	Go to the Airborne Noise Results Report (PDF) - RUBBER SOLUTION
Go to the Impact Noise Results Report (PDF) - SYLOMER SOLUTION	Go to the Airborne Noise Results Report (PDF) - SYLOMER SOLUTION

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

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
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
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
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
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
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
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
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
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 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
Overview Impact noise results - calculated according to Standard ASTM E1007

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

Main Characteristics

The floor plan of the test area and the arrangement of the "Akustik+Sylomer® 25 Floor Mount" mounting elements on the CLT raw ceiling is shown in figure below:

Measurement conditions

• Test area: 13,4m2
• Mass per unit area: 115Kg/m2
• Air temperature in test room 1/2: 20 / 19 °C
• Rel. humidity in test room 1/2: 30 / 31 %
• Static pressure in test room 1: 1006 hPa
• Static pressure in test room 2: 1005 hPa
• Floor surface temperature: 20°C
• Volume of test room 1/2: 52/56 m3

Construction

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		1. CLT 140 5s by Stora Enso
Floating Floor Variant 1		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		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.

Results

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

BARE 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
Ln,w: 90 dB	IIC 20	Rw: 37 dB	STC 37

VARIANT 1
			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
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
			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
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
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.

The majority of buildings use concrete structures as the base material for the construction of different works. It is a low-priced material compared to steel, with a resistance similar to or greater than that of brick, which offers the possibility of building elements of almost any shape.

For this study, a range of tests have been carried out using different solutions for floating floor and the suspended ceiling installations with different types of supports.

The tests were carried out by the National Research Council (NRC) of Canada.

AKUSTIK + SYLOMER FLOOR MOUNTS

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

These supports are normally installed every 0.5 meters, however this distance can be adjusted to suit the load or natural frequency requirement of the application. The natural frequency at its optimum load point reaches values below 12 Hz. These properties provide a high level of noise and vibration insulation when used in light wooden structures.

SRS + SYLOMER SPRING HANGERS

The SRS + Sylomer® are acoustic hangers that have been designed for the suspension of false acoustic ceilings and also machinery that must be suspended. The excellent properties of Sylomer, combined with the low stiffness of the springs, give this product superior anti vibration characteristics when compared with other traditional elements.

Support spacing and spring stiffness can be adjusted to suit the load or natural frequency requirement of the application. The natural frequency at its optimal load point reaches values below 5 Hz. These properties provide a high level of noise and vibration isolation.

RESULTS OF LABORATORY TESTS

In order to show the acoustic advantages of using the aforementioned supports in a concrete structure, impact noise and airborne noise tests are carried out with different configurations:

Configuration	Scheme	Materials
Reference		155mm thick concrete slab.
Configuration C2		155mm thick concrete slab. AMC Mecanocaucho SRS 25 + Sylomer hangers. “C”Channel 1-1/2. Furring Channel 7/8”. 3-1/2” fiberglass insulation. 2 plasterboard plates 16mm thick.
Configuration F1		9mm plywood sheet. 19mm plywood sheet x2 3-1/2” fiberglass insulation. 2x4” wooden profiles. AMC Mecanocaucho Akustik + Sylomer Floor Mount 25. 155mm thick concrete slab.
Configuration C2+F1		9mm plywood sheet 19mm plywood sheet x3 3-1/2” fiberglass insulation. 2x4” wooden profiles. AMC Mecanocaucho Akustik + Sylomer Floor Mount 25. 155mm thick concrete slab. AMC Mecanocaucho SRS 25 + Sylomer hangers. Furring Channel 7/8”. 1” fiberglass insulation. 16mm plasterboard plates x2

The acoustic performance of different solutions can be compared.

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

REFERENCE
Reference concrete slab
Impact noise results – calculated according to Test ASTM E492		Airborne noise results - calculated according to Test ASTM E90
IIC=30	Lnw=80	STC=55	Rw=55
Link for complete report (PDF)

CONFIGURATION C2
SRS 25 + Sylomer
Impact noise results – calculated according to Test ASTM E492		Airborne noise results - calculated according to Test ASTM E90
IIC=59	Lnw=51	STC=75	Rw=75
Link for complete report (PDF)
Estimated natural frequency: 4,0Hz

CONFIGURATION F1
Akustik + Sylomer Floor Mount 25
Impact noise results – calculated according to Test ASTM E492		Airborne noise results - calculated according to Test ASTM E90
IIC=69	Lnw=41	STC=68	Rw=68
Link for complete report (PDF)
Estimated natural frequency: 13,2Hz

CONFIGURATION C2+F1
Akustik + Sylomer Floor Mount 25 + SRS 25 + Sylomer
Impact noise results – calculated according to Test ASTM E492		Airborne noise results - calculated according to Test ASTM E90
IIC=87	Lnw=23	STC=87	Rw=88
Link for complete report (PDF)
Estimated natural frequency: 4,0//13,2Hz

REVIEW
Impact noise results – calculated according to Test ASTM E492	Airborne noise results - calculated according to Test ASTM E90

These results clearly show how acoustic insulation can be improved in concrete structures by using floating floors and suspended ceilings using Akustik + Sylomer® supports.

The use of supports on both sides of the slab allows higher insulation values to be obtained. The solution using SRS + Sylomer supports allows lower natural frequencies to be obtained, this in turn results in a higher isolation level, particularly at low frequencies. The results can be seen for the C2 and C2+F1 configurations.

Feel free to contact our application engineers for more information on these products.

INTRODUCTION

Every day gyms are becoming more popular and the activities in them more extreme. Due to the boom in this type of activity and the business behind it, gyms have moved closer to urban centres.

The proximity of a quality sports facility has innumerable benefits but brings with it a difficult coexistence with the neighbours who are in the same building. Activities such as dumbbell throwing, weight dropping, jumping, etc. generate annoying inconvenience to the neighbours.

This problem is aggravated when this sport activity takes place at night and makes difficult the rest of the neighbours. On many occasions, municipal regulations force the closure of gyms for exceeding the maximum admissible noise limits, resulting in the end of the gym activity and loss of investment.

The correct design of an acoustic solution with a floating floor such as the Sylomer Gym Dry Floor systems can put an end to these disturbances, allowing the coexistence of the neighbour’s rest and the activity of the gym.

THE SYSTEMS THAT HAVE BEEN TESTED ARE:

SYLOMER® GYM DRY FLOOR – BASE:

This system is based on 50 mm Sylomer AFB Floor block installed approximately every 500 mm with metal profiles. Next, 12 mm thick Sylomer SR28 strips, glued to the top of the profiles, and the mineral wool installed in the space between the profiles. The dry floor is made of double 18 mm OSB type 3 board with an interlayer of agglomerated neoprene. A Getzner floor mat 29 final elastic layer is finished with a rubber sports floor on top.

SYLOMER® GYM DRY FLOOR – ADVANCE:

This previous Base system is improved with an additional OSB type 3 board and additional interlayer of agglomerate neoprene. Moreover, the finishing elastic layer is improved with more elastic Getzner floor mat 33 and an extra damping layer with 12,5 mm shock absorb.

SYLOMER® GYM DRY FLOOR – PRO:

The best result is obtained when in the Advance system is replace the finishing elastic layer with the high performance Getzner floor mat 35, besides 25 mm shock absorb is added. The higher damping coefficient helps to dissipated part of the impact energy.

RESULTS OF THE LABORATORY TESTS

In order to show the acoustic advantages when using Sylomer Gym Dry Floor systems, impact noise tests are carried out with different configurations. In addition to this noise tests have been conducted to show the performance of each alternative in the most extreme gym activity. Different weight dumbbells have been thrown from different heights causing different energy impacts in the dry floating floor, at the same time the noise is measured in the lower chamber.

		Impact noise measurement: EN ISO 10140-3	Impact noise improvement evaluation: ISO 717-2	Test Report
Sylomer Gym Dry floor: BASE				Impact Sound GYM Dry Floor Base
Sylomer Gym Dry floor: ADVANCE				Impact Sound GYM Dry Floor Advance
Sylomer Gym Dry floor: PRO				Impact Sound GYM Dry Floor Pro

Together to the standard impact noise, additional measurements have been carried out throwing some dumbbells from different heights. In this way we are simulating the extreme activity in a gymnasium.

Noise level

Tests carried out in Audiotec.

CONCLUSIONS

These results clearly show how the Sylomer Gym Dry Floor can improve noise transmission for gym activity. Impact noise is significantly improved by more than 50 dBs with any of the alternatives.

But what is particularly interesting is the reduction in the maximum noise level achieved in the lower chamber when the dumbbells are thrown. The use of a usual rubber sport floor only achieves a reduction of 10 dBs while Sylomer Gym Dry floor systems achieve reductions of around 50 dBs.

Another point to take into account is the high noise level obtained during dumbbell throwing, the use of a usual rubber sport floor means a noise level around 80 dBs, this level of noise can be very uncomfortable. With Sylomer Gym Dry systems we have managed to reduce the noise level by more than half.

These type of floating floors are absolutely a must for the agreement on the activity of a gymnasium in a building with neighbours.