NEW RESULTS OF LABORATORY TESTS FOR AKUSTIK + SYLOMER MOUNTS USED ON CONCRETE SLABS

NRC Test Result

Acoustic insulation results for installations with 150mm thick concrete slabs using different solutions from the akustik + Sylomer range.

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 C1		155mm thick concrete slab. Akustik + Sylomer Sound Clip. Furring Channel 7/8”. 1” fiberglass insulation. 2 plasterboard plates 16mm thick.
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 C1+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 Akustik + Sylomer Sound Clip. Furring Channel 7/8”. 1” fiberglass insulation. 16mm plasterboard plates x2
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 C1
Akustik + Sylomer Sound Clip.
Impact noise results – calculated according to Test ASTM E492		Airborne noise results - calculated according to Test ASTM E90
IIC=46	Lnw=64	STC=68	Rw=68
Link for complete report (PDF)
Estimated natural frequency: 22,8Hz

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 C1+F1
Akustik + Sylomer Floor Mount 25 + Akustik + Sylomer Sound Clip.
Impact noise results – calculated according to Test ASTM E492		Airborne noise results - calculated according to Test ASTM E90
IIC=69	Lnw=41	STC=76	Rw=76
Link for complete report (PDF)
Estimated natural frequency: 22,8 // 13,2 Hz

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.