NEW LABORATORY TEST RESULTS FOR THE AKUSTIK + SYLOMER FLOOR MOUNTS IN CROSS-LAMINATED TIMBER (CLT) STRUCTURES

New Clt Laboratory Results

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		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.

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.