Innovative Sound Control with Sylodyn®
for the Timber Construction Sector
Decoupling of Flanking Sound

Highly effective sound decouplingwith Sylodyn®

Approved static certification (abZ):
Z-16.8-468

Comprehensive system solutions
from bearing to fastener

Stick with what works
and welcome what’s new

Building projects, and therefore the planners and companies
carrying out the construction work, have faced steadily increasing requirements in recent years. As a result, timber construction is proving to be particularly innovative. Cost savings
through short construction times and precise prefabrication, areduction in grey energy through the increased use of raw materials with a negative CO2 balance, flexible planning thanks to low
dead weights, as well as digitalisation in project planning and in
manufacturing, are just a few of the key areas at present.

2

At the same time, smart solutions to the requirements placedon the statics, fire protection, and even sound control, are being
found as a result of the ongoing development of planning methodologies and increasingly innovative products.
Getzner Werkstoffe has for many decades now been providing
active support with its expertise and its Sylodyn® and Sylomer®
products.

Time and costsavings

Low
dead weight

Negative CO2balance3

Keyparameters
Sound control level
Sound
Rated sound reduction index R
Level difference
Impact noise levelLow-frequency noise
Flanking transmission paths
Vibration reduction index Kij

Comfort is more than just aminimum of sound control

Defining the requirements

The appropriate sound control level

Choosing the correct target value is a prerequisite for optimum
project planning in the area of sound control. This is normallychosen according to national standards or guidelines. The minimum requirements specified in these standards only rarely satisfy the expectations of the residents who will be living in theproperty in the future. On the one hand, this is because the subjective response to someone walking around in the room above
can only be replicated to a limited extent using standard parameters and, on the other hand, because some countries use component parameters as planning values, which sheds very little lighton the actual conditions in the room. Getzner therefore recommends discussing and defining the desired sound control levelwith the future residents in advance.

To help choose the right sound control level, various associations
have developed categories that allow a more precise selection to
be made. As well as defining various classes, an attempt has also
been made to represent the subjective perception. As perception
differs from person to person, the comparison shown in Table 2
has to be seen purely as a guideline.
Additional classifications exist that lend themselves to the definition of the sound control level. The classification shown in the tables below is based on DEGA recommendation 103.1

F

E

D

C

B

A

A*

L‘n,w

> 60 dB≤ 60 dB≤ 50 dB≤ 45 dB≤ 40 dB≤ 35 dB≤ 30 dB

R‘w< 50 dB≥ 50 dB≥ 54 dB≥ 57 dB≥ 62 dB≥ 67 dB≥ 72 dB

Tab. 1 DEGA recommendation 103 for the sound insulation of ceilings and walls

Walking noises

Very clearly audible

Clearly audible

AudibleStill audible

Not audible

Not audible

Loud speech

Very intelligible, very clearly audible

Very intelligible,
clearly audible

Partly intelligible,
in general audible

In general, notintelligible, partly
audibleNot intelligible,
still audible

Not intelligible,
not audible

Tab. 2 DEGA recommendation 103 Noise perception

1

6

Austrian Standard B8115-5, Sound control and room acoustics in buildings - Part 5: Classification;
VDI 4100, Sound insulation between room in buildings - Dwellings - Assessment and proposals for enhanced sound insulation between rooms;
DEGA Recommendation 103 (2018), Sound insulation in housebuilding - sound insulation certificate;
SS 25267, Building acoustics - Sound classification of spaces in buildings - Housing;
ISO FDIS 19488, Acoustics - Acoustic classification of dwellings

SoundSound is a physical phenomenon. It describes a mechanicalvibration that emanates from a source and is distributed via
a medium by causing the mass particles to become agitated.

Rated sound reduction index R
The rated sound reduction index R describes the difference inlevel between two rooms and hence the sound insulating characteristics of a partitioning element. This value can only be tested
in the laboratory. Other transmission paths exist that will affectthe level in the receiving room. This is referred to as the construction rated sound reduction index R‘. The higher the difference inlevel, the better the soundproofing properties of the component.

Sound level difference D
The standard sound level difference DnT describes not just thesound attenuation between two rooms, it also considers roomcharacteristics such as reverberation time and room volume.
The relationship between the variables R‘ and DnT is describedas follows.

R‘ = L1 – L2 + 10 log
L1
L2
SS
A

( SA )s

Mean level in transmitting room
Mean level in receiving room
Area of partitioning element in m2
Equivalent absorption area in receivingroom in m2

0.16 VDnT = R’ + 10 log
T0 Ss
0.32 VR‘ + 10 log
Ss

(

(

V
T0

)=

)

Volume of receiving room in m3
Reference reverberation time 0.5 s

Impact noise level L( AA )The normalised impact noise level Ln describes the level of aseparating ceiling which is artificially agitated by using a standard hammer mill. The lower the measured level, the better the
impact noise insulation properties of the separating ceiling.

L’n = Li + 10 log

The relationship between the normalised impact noise level L’nand the standard impact noise level L’nT is described as follows.

L‘nT = L‘n – 10 log

Li
A0

0

Mean level in receiving room
Reference absorption area, A0 = 10 m2

V( 0.16
A T )=

L’n – 10 log (0.032 V)

0

0

7

Low-frequency impact noise

Today, project requirements in terms of impact noise are still
normally defined as L‘nw or LnTw. This definition deals exclusively
with frequencies of between 100 and 3150 Hz, in other words justpart of the range that is perceivable to the human ear. However,
the impact noise of footfall has a much lower frequency, particularly when walking. As numerous studies have shown2, this is far
better expressed using the value LnTw + CI50-2500. As no standardised
computation methods are available for this variable, Getznerrecommends using tested component data during the planningphase.

Impact noise level in dB

A closer look at low-frequency impact noise LnTw + CI50-2500

80

70

60

50

40

LnTw + C150 – 2500
LnTw
C150-2500

Computed standard impact noise level
Spectrum adaptation value

30

20

10

0
25

40

63

100

160

250

400

640

1,000

Frequency in Hz
L Standard hammer mill
L Walker
2

8Andreas Rabold / Ulrich Schanda / Joachim Hessinger: Correlation of impact noise transmission between walker
and standard hammer mill, Conference proceedings, DAGA’ 11, Düsseldorf 2011

Flanking transmission paths

In addition to the direct transmission path through the partitioning element itself, a significant amount of the acoustic energy isalso transmitted via the adjacent flanking components. There are
therefore different initiating and radiating scenarios dependingon the excitation. The sum of the transmission paths then gives
the rated sound reduction index R‘ for the building and the total
impact noise level L’n. The computation for the individual transmission paths is based on EN 12354-1 and EN 12354-2. 3
As the quality of the ceiling component improves, the greater
the effect of the flanking. This can be exemplified using the correction value K as per DIN 4109, which, depending on the implementation, can deviate significantly from the curve (see page 8).
In the case of impact noise, the effect of the flanking is primarily
determined by the type of false ceiling, as the screed and finishof the raw ceiling can both contribute towards an improvementin the transmission paths Dd and Df. The following equations canbe used for the individual transmission paths:

Df
Fd
Ff

Dd

F – Flank excitedD – Directly excitedf – Flank radiatedd – Directly radiated

Airborne sound transmission as per EN 12354-1

S
Rij,w = Ri,w + Rj,w + ∆Rij,w + Kij + 10 log S dB
2l0 lij(R’w = –10 log 10
Rij,w
Ri,w
Ri,w
∆Rij,w-RDd,w10+ ∑10-RDf,w10+ ∑10-RFd,w10+ ∑10-RFf,w
10

Computed flanking sound reduction index for the transmission path ij
Computed rated sound reduction index of the initiating component i
Computed rated sound reduction index of the radiating component i
Overall improvement in airborne noise reduction index through theuse of additional constructions in the transmitting and receivingrooms of the flanking component

)dB
R’w
Kij
SS
l0
lij

Computed overall flanking sound reduction index
Vibration reduction index for the transmission path ij
Area of partitioning element
Reference coupling length, l0 = 1 m
Combined coupling length of the components i and j

Impact noise transmission as per EN 12354-2

SLn,ij,w = Ln,eq,0,w ∆Lw + Ri,w + Rj,w – ∆Rj,w – Kij –10 log i dBl0 lij2(

Ln,d,w

Ln,Df,w

L’n,w = 10 log 10 10 + ∑10 10
Ln,ij,w
Ln,w
Ln,eq,0,w
∆Lw
Si

3

)dB

Computed normalised impact noise level for the transmission path
Computed overall normalised impact noise level
Equivalent computed normalised impact noise level of the raw ceiling
Computed impact noise reduction of floor covering in the transmitting room
Ceiling area

EN 12354-1, Building acoustics - Estimation of acoustic performance of buildings from the performance of elements - Part 1: Airborne sound insulation between rooms
EN 12354-2, Building acoustics - Estimation of acoustic performance of buildings from the performance of elements - Part 2: Impact sound insulation between rooms;
DIN 4109, Sound insulation in buildings, requirements and verification
9Vibration reduction index Kij

The vibration reduction index Kij has a key role in transmission
via flanking elements. It provides information about the qualityof the acoustic coupling of a component joint. The higher the
Kij value, the less sound is transmitted via the joint. Getzner has
collaborated with various external testing institutes to calculate
this reduction for different kinds of joints by carrying out test rig
measurements according to EN ISO 10848. The Kij values shownin Table 3 (p. 20) can therefore be used as reliable planning values
in the respective forecasting models. Note that the values havebeen tested with the fastening to provide realistic results.

Addition K for flanking transmission

13 dB
potential for
improvement

12

10

8

6

4

2

0
30

35

40

45

50

55

60

65

70

Ln,w of the partitioning element in dB

Kij = Dv,ij + 10 log
Dv,ij
lij
ai
ai

10

( ala )ij

i j

Averaged velocity level difference between
the initiating and radiating components in dB
Combined edge length of the initiating andradiating components in m
Equivalent absorption length of the initiating
component in m
Equivalent absorption length of the radiating
component in m

Fig. 1: Sound control in timber construction – fundamentals
and initial assessment, Informationsdienst HolzProducts &assessment
Sylodyn®
Assessment
Approvals
Fasteners

Product overview

Sylodyn® strip bearing
6 and 12 mm bearing thickness
8 bearing stiffnesses with a static range of use of up to 12 N/mm2

GEPI angle bracket
3 types (GEPI 80, GEPI 100 and GEPI 240)

Sylodyn® washers
With and without centring aid
M8 to M27 screw diameter

Adhesive
Spray adhesive
Spray tank

Self-adhesive version
14

Sylodyn® –part of a system solution

Sylodyn® strip bearing
Sylodyn® is a closed cellular polyurethane material with outstanding spring characteristics, which make it particularly suitable forthe decoupling of vibration and sound. The elastic bearings areavailable in various degrees of stiffness and colour-coded to enable
them to be identified and checked easily on site.
Ranges of use in timber construction:— Glued laminated timber (BSH)— Cross laminated timber (CLT)— Laminated veneer lumber (LVL)— Hollow enclosed-section elements— Wooden frame construction— Modular construction— Wood-concrete composite systems
Advantages:— Proven vibration reduction Kij— Compensates for unevenness— Suitable for high loads— Excellent long-term behaviour and high degree of ageing
resistance— Can be applied during prefabrication— Structural analysis by means of assessment concept based ontechnical approval— Negligible settlement and creep behaviour
Dimensions:— Bearings of various thickness can be selected according to
the level of effectiveness required. The standard thickness forGetzner Sylodyn® materials is 12 mm; 6 mm and 25 mm options
are available on request.
— Generally speaking, the width of the elastomer bearing depends
on the wall thickness, but can be adjusted to meet a customer’s
requirements.
— The standard delivery length is 1500 mm. Any remnants can bereused as required, meaning there is hardly any waste.
— Implementation: Getzner will, if required, apply a double-sided
adhesive tape to its bearings prior to prefabrication in thefactory.

Sylodyn®
NB

Sylodyn®
NC

Sylodyn®
ND

Sylodyn®
NE

Sylodyn®
NF

Sylodyn®
HRB HS 3000

Sylodyn®
HRB HS 6000

Sylodyn®
HRB HS 12000

0.075 N/mm2

0.150 N/mm2

0.350 N/mm2

0.750 N/mm2

1.500 N/mm2

3.000 N/mm2

6.000 N/mm2

12.000 N/mm2

15

Kij in dB

Acousticallydecoupled fasteners

35

Sound bridges must be avoided during planning and implementation. This involves ensuring the right fastener is chosen. Thesefasteners must be acoustically optimised and statically verifiable.

30

For this purpose, Getzner has worked with established partners in
the timber construction industry to develop solutions for corners,
screw connections and plug-in connections.

25

20

15

10
Sylodyn® with rigid fasteners
Sylodyn® with decoupled fasteners
Rigid fastening

5

0
100

160

250

400

630

1,000

1,600

2,500

Fig. 2: K1.2 Plot for a T-joint with Sylodyn® and elastic fastener,
Sylodyn® with rigid fastener and without elastomer
intermediate layer

Frequency in Hz

Acoustically optimised joint detail

6
5
2

16

Sylodyn® flank decoupling2

Elastic washer

3

Elastic angle bracket

4

Akustik + Sylomer® ceiling hangers

5

AFM impact noise insulation

6

Elastic edge insulation strip

3

1

1

1

4

Optimal angle bracket

Among other things, two high-performance, acoustically decoupled brackets were developed in a collaboration between Pitzl
Metallbau, the University of Innsbruck and Getzner Werkstoffe.
These provide high levels of resistance to shear and tensile
forces and verifiably prevent sound transmission via flanking

Angle bracket GEPI 80

elements. The three angle brackets are suitable for both timbertimber and timber-concrete connections and have European Technical Approval for a reliable structural analysis. Dynamic studies
have also examined the earthquake resistance of GEPI 240.

Angle bracket GEPI 100

Typical load-bearing capacity

Angle bracket GEPI 240

Typical load-bearing capacity

Typical load-bearing capacity

F1 tensile

F2/3 shear

F4/5 shear

Serviceclasses

F1 tensile

F2/3 shear

F4/5 shear

Serviceclasses

F1 tensile

F2/3 shear

F4/5 shear

Serviceclasses

8 kN

5 kN

5 kN

1+2

16 kN

12 kN

12 kN

1+2

50 kN

60 kN

12 kN

1+2

Installation tip
Use the assembly tool to ensure the bracket is pre-tensioned
correctly.

Screws required
Quantity

Type

Size

ThreadShank 1

3

Roundheaded

8 × 80 mm

PartialthreadShank 2

2

Countersunk

8 × 160 mm

Full thread

Shank 1

5

Roundheaded

8 × 80 mm

PartialthreadShank 2

4Countersunk

8 × 160 mm

Full thread

Shank 1

16

Roundheaded

8 × 80 mm

PartialthreadShank 2

11

Countersunk

8 × 160 mm

Full thread

GEPI 80

GEPI 100

GEPI 240

Fig. 3: Elastic angle bracket GEPI Connect 240

17

How to make a goodscrew connection

One of the most important fasteners in timber construction is
the screw connection. The avoidance of sound bridges in thisarea requires a clean implementation and the use of elasticallydecoupled washers.
Packaging unit 100 pcs.

Fig. 4: Predrilled hole

Illustration

18

Installation instructions:— Elastically decoupled screw connection should always be
predrilled in the component above the bearing.
Ø predrilled hole = Ø screw thread— Screw head and washers should be countersunk.
— Use of partially threaded screws so that the thread is only
anchored in the component under the bearing.
— Elastic washers are to be used.

Fig. 5: Use of an elastic washer

Fig. 6: Installation

ArticleThicknessScrew size

External diameter

Hole diameter

EW M8-6

6 mm

M8

35 mm

9 mm

EW M10-6

6 mm

M10

40 mm

11 mm

EW M12-6

6 mm

M12

50 mm

13 mm

EW M16-6

6 mm

M16

55 mm

17 mm

EW M8-8

8 mm

M8

28 mm

9 mm

EW M10-8

8 mm

M10

34 mm

11 mm

EW M12-8

8 mm

M12

44 mm

13 mm

EW M16-8

8 mm

M16

56 mm

17 mm

EW M8-12

12 mm

M8

35 mm

9 mm

EW M10-12

12 mm

M10

40 mm

11 mm

EW M12-12

12 mm

M12

50 mm

13 mm

EW M16-12

12 mm

M16

55 mm

17 mm

EW M8-21

21 mm

M8

28 mm

9 mm

EW M10-21

21 mm

M10

34 mm

11 mm
13 mm

EW M12-21

21 mm

M12

44 mm

EW M16-21

21 mm

M16

56 mm

17 mm

EW M20-21

21 mm

M20

60 mm

21 mm

EW M27-21

21 mm

M24, M27

70 mm

28 mm

Construction rules

No dry lining on the walls andno suspended ceilings

Dry lining on walls,
no suspended ceiling

Sylodyn® bearing above the ceiling

Sylodyn® bearing above the ceiling

Suspended ceiling andno dry lining on walls

Two-shell ceiling systems andno dry lining on the walls

Sylodyn® bearing above and below the ceiling

Sylodyn® bearing between the ceiling components

19Vibration reduction index

An elastic joint with an Sylodyn®
will result in the same acoustic
efficiency, than an additional
dry lining layer.
Rigid

K12 = 10.1 dB
Average value from different test rigs

Ensure that elastic decoupling is installed across the entire system.
This will mean that all fasteners, such as brackets or screws, areacoustically optimised. Rigid fasteners reduce the effectivenessof the overall solution compared to bearings with elastically decoupled fasteners.

Sylodyn® 12.5 mm

Sylodyn® 6 mmincl. elastic fastenerincl. elastic fastener

K12 = 23.1 dB
with bearing

K12 = 17.2 dB
with bearing

Joint design1
2

K12 = 12.6 dB
Average value from different test rigs

K12 = 24.5 dB
with bearing

K12 = 20.6 dB
with bearing

4
K24 = 20.8 dB
Average value from different test rigs

K12 = 13.6 dB
Average value from different test rigs

K24 = 25.6 dB
Average value from different test rigs

K24 = 33.3 dB
Top or bottom bearing

K24 = 29.6 dB
Top or bottom bearing

K24 = 35.1 dB
Top and bottom bearing

K24 = 32.2 dB
Top and bottom bearing

K12 = 25.5 dB
with bearing

K12 = 20.2 dB
with bearing

K24 = 35.8 dB
Top or bottom bearing

K24 = 33.2 dB
Top or bottom bearing

K24 = 39.0 dB
Top and bottom bearing

K24 = 35.7 dB
Top and bottom bearing

K13 = 3.8 dB
Top and bottom bearing

K13 = 4.2 dB
Top and bottom bearing

1
2

4

3

1
2

K13 = 6.7 dB
Average value from different test rigs

Tab. 3: Kij values compared: rigid, Sylodyn 12.5 mm and Sylodyn 6 mm
Frequency-dependent Kij values and values for other bearing thickness and fastening solutions available on request.
Figures taken from 4

420

Teibinger, M., Dolezal, F., Matzinger, I., (2009), Deckenkonstruktionen für den Mehrgeschossigen Holzbau, Vienna [Ceiling structures for multi-story timber buildings];
Schoenwald, S., Kummer, N., Wiederin, S., Bleicher, N., Furrer, B., (2019) Application of elastic interlayers at junctions in massive timber buildings, Aachen;
Measurement report STM001 ACOM Research (2020);
Measurement report 5211.01299-1 EMPA (2018)

Assessment

Choice of bearing andstatic certification
1. Certificate of application suitability (GZG)
Getzner has defined a static range of use σR,perm in order toachieve a dynamically optimum and lasting level of effectiveness.
The quasi-permanent specific loads σE,quasiperm that impinge on thematerial in the long term must lie within the static range of useof the respective Sylodyn® product. This will ensure that undernormal usage conditions the material is used in the correctmanner and will be acoustically effective.

2. Certificate of structural safety (GZT)
An appropriate assessment concept based on national technicalapproval (abZ) must be used for the structural analysis in thebuilding and construction industry. Getzner has appropriately
tested and approved elastomers and an assessment concept
based on this that has been verified by experts. The permissible
bearing resistances σR,d can be found in the diagram below.

Static range of use and design loads

Sylodyn® NF

Sylodyn® NE

Design level

Quasi-static
load

Sylodyn® ND

Design level

Quasi-static
load

Sylodyn® NC

Sylodyn® NB

Design level

Quasi-static
load

Design level

Quasi-static
load

Design level

Quasi-static
load

0.05

0.1

0.15

0.2

0.3

0.4

0.5

1.0

1.5

2.0

2.5

3.0
4.0
5.0
Specific load in N/mm²

Line loads for the choice of bearing for residential buildings can be calculated in GZG as follows: gk + 0.3 qk
Sylodyn® insulating strips are designed in such a way that the acoustic characteristic values on page 8 can be used when employing
the materials, including elastically optimised fasteners, with the specified loads.
The design of the bearing can be determined using the free online TimberCalc tool (https://apps.getzner.com).

21

Tested and certified
product quality

The national technical approval provides evidence of the suitabilityof our materials with respect to construction requirements suchas reliability, durability and quality.
Product-specific properties of Sylodyn®, such as creep behaviour,
settlement behaviour and torsion, have been tested.

By granting approval, the Deutsches Institut für Bautechnik
DIBt [German Institute for Building Technology] officially certifies that the bearings meet all the requirements for reliable use
in the building and construction industry.

Certificate of vertical load transmission

Non-slip certificate

FE,z,d ≤ FR,z,dFE,xy,d ≤ FE,z,d • μFR,z,d = σR,d • AAFE,z,dFR,z,dσR,dLoaded surface of the bearing
Vertical effect at design level
Vertical bearing resistance at design level
Bearing resistance at design level according toSylomer® and Sylodyn® assessment concept
by Getzner

Certificate of horizontal load transmission

FE,xy,d ≤ FR,xy,dFR,xy,d = G • A • εxy,dExtract from the assessment concept. Complete version available on request.

22

If this cannot be achieved, suitable anchor points or design
enhancements (e.g. elastically insulated shear keys) must be
provided.
A
Fxy,dFE,xy,dFR,xy,dFE,z,dGεx y,dμ

Loaded surface of the bearing
Bearing reset force
Horizontal effect at design level
Horizontal bearing resistance at design level
Vertical effect at design level
Shear modulus according to assessment concept
Measured shear distortion
Coefficient of friction of elastomer on the adjacent component; μ values for concrete = 0.7; for steel and wood = 0.5 (or measured value)

Maximum bearing resistances for vertical and horizontal loadtransmission are derived using the TimberCalc online app.

Statically investigatedconnection details

Getzner offers the timber industry a variety of elastomer-based
acoustic solutions that also meet static requirements. As partof a study5 carried out by Getzner in collaboration with the University of Innsbruck, the properties of Sylodyn® bearings incombination with elastic screw connections in timber construction were tested. Two different approaches are illustrated below:

A normal connection with 8 standard screws with noelastic bearing

2 A connection with an elastomer strip, 8 standard screws

The main findings— Elastomers are a very good way of meeting both the acoustic
and static requirements.
— The test results demonstrate that the horizontal characteristic load capacity of both tested connections is more or lessidentical, and in any event significantly larger than the values
calculated according to Eurocode 5. As the superimposed loadincreases, the elastically mounted test scenario returns evenbetter values than the rigid joint.
— The initial rigidity of the joint is reduced by the introduction ofan elastomer.

120

8,000

100

7,000

80

6,000

60

5,000

40

4,000

Slip modulus in kN/mm/m

and elastic washers

Horizontal thrust in kN/m

1

Preload force
0 kN/m
30 kN/m

20

V01a

V00

3,000

Variant

5

Reichelt, H., Gerhaher U., Wiederin, S., Maderebner, R., (2016), Characteristics of acoustic layers for structural design of timber constructions, Vienna

23

Fire properties of Sylodyn®

Study6— Fire resistance of wall-ceiling connections in cross laminatedtimber constructions— Two connections: implemented using Sylodyn® bearings— The fire load was exposed to a standard temperature curve for
60 minutes in a fire chamber— The solid wood elements were screwed together with a
12.5 mm thick Sylodyn® bearing placed between the elements— A 12.5 mm thick gypsum plaster fire protection board was applied to the party wall - the structural component; the ceiling
was made of unplanked exposed timber.
— The connecting joint exposed to the fire between the wall andthe ceiling was filled with two different materials, an intumescent material (Intumex AN) and a conventional acrylic paste.

ResultIn both tested configurations, the temperature on the side of thejoint facing away from the fire remained below 30 °C for the duration of the test. The joints therefore satisfy the fire-resistancerequirements for at least 60 minutes.
Conclusion
The experiments demonstrated that Sylodyn® meets the fireresistance requirements in the connecting joint between the walland ceiling.

Fig. 7: Connection detail after exposure to fire for 60 minutes

6

24

Research report by Holzforschung Austria: Urbanes Bauen in Holz- und Holzmischbauweise (Untersuchungen zum Brandverhalten von Wand- und Deckenanschlüssen), [Urban construction in timber and mixed timbers (studies of the fire properties of wall-ceiling connections)] Vienna 2008, M.Teibinger, I.Matzinger

Airtightness of Sylodyn®

The flow of air through the cracks or joints in the shell of abuilding should be prevented for a number of reasons. A highpercentage of building damage can be laid at the door of apoorly constructed building shell. In addition to excessively
high heat loss, draughts cause an uncontrolled transport ofmoisture and add to the discomfort of the residents.
Measuring airtightness
The airtightness of a building is measured using what is known
as the “blower door test”. This procedure determines the air exchange rate and identifies leakages and weak points in the building shell.
The use of elastic Sylodyn® strips compensates for any slight unevenness in the joint between the ceiling and the wall, thus sealing any potentially weak spots and preventing any gaps forming.
The Sylodyn®-based elastomer bearings are made from polyurethane with a closed cellular structure, which is perfect for creating airtight connections between the wall and the ceiling. In order
to meet the usual requirements in terms of wind protection, it isimportant to ensure that the bearings are installed correctly andwithout any gaps (joint to joint). This assumes that the bearing isinstalled according to the installation instructions.

Differential pressure
measurement∆ p = 50 Pa(0.5 mbar)

Door

V = ..... m3/h
Volumetric flow
measurement
Fann 50 = .....

Volumetric flow
[1/h]
Building volume

25

Installation instructions

1 Carefully read through the instructions

2 Check that the supplied materials

match your installation plan. Ensurethat you are aware of the exact position of the elastomers.

construction specifications (e.g. setting threshold, base connection) andmark the positions of the bearings.

4 Refer to the construction or installa-

5 The bearings can now either be applied

6 Installation of bearings according totion plan to cut the materials to therequired length.

with a spray adhesive or fastened mechanically to prevent them slipping
while the timber elements are positioned.

installation plan. The bearings can be
butt-joined if required.

Any remnants can be reused, reducing
waste to a minimum.

Please note: Mechanical fastenings
must lie at least 3 mm below the surface of the material.

3 mm

26

3 Prepare the substrate as set out in thein the Installation Instructions before
starting any work.

Please note: Airtightness can only beachieved if the bearings are installed
correctly.

7 Positioning the timber elements

Please note: If the elastomers are notsecured, care must be taken during
positioning to ensure the bearings are
not moved.

10 A complete separation or elastic decou-

pling of adjacent components (façade,inferior purlin) is also required.

8 Frictional connections between decou-

9 Screw connections must be pre-drilled.

pled elements must also be decoupled(e.g. GEPI angle brackets).

Elastic washers must be used to decouple the screw.

11 Repeat the process for all other re-maining levels.

Please note: Continuous elements
can create secondary sound paths.

Installation video
27

Smooth and efficient
project planning with TimberCalc

SimpleClear

1 Based on the structural conditions and any already definedceiling and wall structures, the necessary bearing positions
can be ascertained with the help of the construction rules on
page 19.

Quick

3 The appropriate Sylodyn® bearings for the loads in question

are selected using the TimberCalc calculation program. TimberCalc is available free of charge from http://apps.getzner.com.

4 All the data necessary for determining the ideal Sylodyn®
2 Various components that make up the ceilings and partitions

can be found on pages 33-38. Together with the Kij values(page 20), these can be used for the EN 12354 calculation(page 9) to determine the expected level of sound control.

28

bearing is entered from the input screen— Item number— Length, width and thickness of the bearing— Type of bearing (point / strip)— Characteristic dead weight— Characteristic working loadGive it a try!

5 The program determines which type of Sylodyn® is best anddisplays all the relevant material data at a glance— Existing bearing pressure— Optimum material— Deflection (after 1 day and 10 years)— Natural frequency— Capacity of material

7 It will then be available at every workstation for the straight-

forward creation of a parts list and an installation plan basedon existing plans.

8 The Sylodyn® bearings are installed in accordance withthis parts list and the installation plan created by Getzner
Werkstoffe at the request of the customer (charged at cost).
This will ensure a problem-free installation. It is also possible
for a Getzner employee to oversee the installation on site.

6 The table produced by the program canbe downloaded in PDF format. The data can also easily be imported into other programs, e.g. Excel, for further processing.

29

Detailed
drawings
Structures
Detailed solutions
Ceiling-party wall joints

Detailed drawingsG

etzner provides appropriate solutions to a variety of challenges and can draw on years of experience. We develop
bespoke design drawings in collaboration with our customers,
taking the respective project-specific requirements into account.

Maßstab:
1:5

8
7
6
13

5
4

12
3
11

2

10
1
9

7 Estrich
1 Abgehängte Decke

8 Fußboden

2 Decken Balken

9 Holzrahmenkonstruktion

3 PE Folie

10 Sylodyn® 12 mm

4 OSB

11 Elastische Unterlagscheibe

5 Schüttung

12 Montageschwelle

6 Trittschalldämmung

13 Aussenwandverkleidung

Getzner Werkstoffe GmbHA - 6706 Bürs | Herrenau 5
T +43-5552-201-0 | F +43-5552-201-1999
E info.buers@getzner.com | www.getzner.com

Holzrahmen Wand-Deckenverbindung
mit elastischer Entkoppelung

32

Format:Maßstab:

1:5
Gezeichnet:

DIN A4
Datum:

BAJ

23.04.2020

ALLE RECHTE VORBEHALTEN. Die Vervielfältigung oder Weitergabe dieses Dokuments ist ohne vorherige schriftliche Zustimmung der Getzner Werkstoffe GmbH untersagt.

Sound control ex works
To further enhance the level of prefabrication, Getzner offers theoption of applying the bearings directly to the corresponding elements in the factory. Two approaches have proved themselves
over the years: Bonding the bearings to the elements using sprayadhesive and the use of Sylodyn® secured with double-sided adhesive tape.

Component catalogue – ceilings

Airborne noise

Impact noise

Box element with dry screed

25 mm

Dry screed 28.7 kg/m2

20 mm

Wood fibre s‘≤ 30 MN/m3

30 mm

Honeycomb filling 45 kg/m2

200 mmSurface element 39 kg/m2
with stone chippings 90 kg/m2

Rw 68 dB

Lnw 48 dB
CI50-2500 +6 dB

Box element with cement screed

50 mm

Cement screed 110 kg/m2

40 mm

Mineral fibre insulation s‘ < 7 MN/m3

60 mm

Stone chippings 84 kg/m2

200 mmPanel element 39 kg/m2

Rw 71 dB

Lnw 45 dB
CI50-2500 +6 dB

Box element with false floor

32 mm

False floor deck 52 kg/m2

100 mm

Support with Sylodyn® false floor pad

50 mm

Cement screed

40 mmMineral fibre insulation s‘≤ 7 MN/m3

200 mmPanel element 39 kg/m2
with stone chippings 50 kg/m2

Rw 74 dB

Lnw 41 dB
CI50-2500 +12 dB

33

Component catalogue – ceilings

Airborne noise

Impact noise

Timber ceiling with concrete slab filling

50 mm

Cement screed 120 kg/m2

40 mm

Mineral fibre insulation s‘≤ 6 MN/m3

40 mm

Concrete slabs 100 kg/m2

22 mm

Planking 15 kg/m2

280 mmBeam ceiling 30.7 kg/m2

Rw 72 dB

Lnw 47 dB
CI50-2500 +4 dB

Timber ceiling with stone chippings

50 mm

Cement screed 120 kg/m2

40 mm

Mineral fibre insulation s‘≤ 6 MN/m3

30 mm

Chippings 45 kg/m2

22 mm

Planking 15 kg/m2

280 mmBeam ceiling 30.7 kg/m2

Rw 67 dB

Lnw 50 dB
CI50-2500 +4 dB

Timber ceiling with suspended substructure and dry screed

2 × 10 mm

Dry screed 36.5 kg/m2

65 mm

Pressure-resistant mineral fibre insulation s‘≤ 50 MN/m2

25 mm

Solid wood panel 11.8 kg/m2

220 mmBeam ceiling with void damping, Akustik + Sylomer® ceiling hangers

50 mm

Suspended substructure 1.8 kg/m2

15 mm

Ceiling lining 16 kg/m2

Rw 69 dB34

Lnw 50 dB
CI50-2500 +6 dB

Airborne noise

Impact noise

Timber ceiling with suspended substructure, dry screed and ceiling filling
25 mm

Dry screed 26.7 kg/m2

22 mm

Wood fibre s‘≤ 30 MN/m3

60 mm

Stone chippings 90 kg/m2

25 mm

Planking 11.8 kg/m2

280 mmJoist support structure with void damping 30.7 kg/m2

50 mm

Akustik + Sylomer® ceiling hangers with substructure 1.8 kg/m2

2 × 15 mm

Double-layer ceiling lining 32 kg/m2

Rw 75 dB

Lnw 40 dB
CI50-2500 +6 dB

Timber ceiling with suspended substructure and cement screed

55 mm

Cement screed 110 kg/m2

30 mm

Mineral fibre insulation s‘≤ 6 MN/m3

25 mm

Planking 11.8 kg/m2

280 mmBeam ceiling with void damping, 30.7 kg/m2

50 mm

Akustik + Sylomer® ceiling hangers
with substructure 1.8 kg/m2

2 × 15 mm

Double-layer ceiling lining 22 kg/m2

Rw 67 dB

Lnw 48 dB
CI50-2500 +10 dB

Timber ceiling with Sylomer® and insertion boards

53 mm

Cement screed on trapezoidal profile 176 kg/m2

12 mm

Sylomer® bearing

220 mmBeam ceiling with insertion board and filling 120 kg/m2

18 mm

Ceiling lining 26 kg/m2

Rw 70 dB

Lnw 46 dB
CI50-2500 +8 dB

35

Component catalogue – ceilings

Airborne noise

Impact noise

Timber beam ceiling with Sylomer® and suspended substructure

53 mm

Cement screed on trapezoidal profile 176 kg/m2

12 mm

Sylomer® bearing

220 mmJoist support structure with void damping 120 kg/m2

20 mm

Akustik + Sylomer® ceiling hangers with substructure 1.8 kg/m2

25 mm

Double-layer ceiling lining 26.7 kg/m2

Rw 77 dB

Lnw 38 dB
CI50-2500 +4 dB

Cross laminated timber ceiling with cement screed

80 mm

Cement screed 176 kg/m2

30 mm

Mineral wool s‘≤ 6 MN/m3

60 mm

Stone chippings 84 kg/m2

200 mmCross laminated timber ceiling (CLT) 94 kg/m2

Rw 70 dB

Lnw 45 dB
CI50-2500 +6 dB

Cross laminated timber ceiling with dry screed and suspended substructure
25 mm

Dry screed 26.7 kg/m2

22 mm

Wood fibre s‘≤ 30 MN/m3

60 mm

Stone chippings 84 kg/m2

200 mmCross laminated timber ceiling (CLT) 94 kg/m2

120 mmAkustik + Sylomer® ceiling hangers with substructure
and void damping 1.8 kg/m2

15 mm

Ceiling lining 16 kg/m2

Rw 69 dB36

Lnw 46 dB
CI50-2500 +8 dB

Airborne noise

Impact noise

Cross laminated timber ceiling with cement screed and suspended substructure

50 mm

Cement screed 105 kg/m2

30 mm

Mineral wool s‘≤ 8 MN/m3

65 mm

Stone chippings 90 kg/m2

200 mmCross laminated timber ceiling (CLT) 94 kg/m2

100 mmAkustik + Sylomer® ceiling hangers with substructure
and void damping 1.8 kg/m2

2 × 12.5 mm

Double-layer ceiling lining 26.7 kg/m2

Rw 82 dB

Lnw 23 dB
CI50-2500 +26 dB

Cross laminated timber ceiling with cement screed and rigid substructure

80 mm

Cement screed 176 kg/m2

30 mm

Mineral wool s‘≤ 6 MN/m2

200 mmCross laminated timber ceiling (CLT) 94 kg/m2

40 mm

Counterbattening 2 kg/m2

15 mm

Ceiling lining 16 kg/m2

Rw 64 dB

Lnw 51 dB
CI50-2500 +5 dB

Cross laminated timber ceiling with terrace grating

26 mm

Wooden floorboards 10 kg/m2

44 mm

Squared timber

12 mm

Sylomer® terrace pad

40 mm

Concrete slabs and stone chippings 90 kg/m2

200 mmEPS isolation 2.5 kg/m2

140 mmCross laminated timber ceiling (CLT) 63 kg/m2

90 mm

Akustik + Sylomer® ceiling hangers with substructure
and void damping 1.8 kg/m2

2 × 12.5 mm

Double-layer ceiling lining 26.7 kg/m2

Rw 72 dB

Lnw 45 dB
CI50-2500 +4 dB

37

Component catalogue – ceilings

Airborne noise

Impact noise

Timber-concrete hybrid ceiling with cement screed

50 mm

Cement screed 120 kg/m2

40 mm

Mineral wool s‘≤ 7 MN/m3

80 mm

Top concrete layer 200 kg/m2

120 mmLaminated timber ceiling 54 kg/m2

Rw 67 dB

Lnw 46 dB
CI50-2500 +5 dB

Timber-concrete hybrid ceiling with false floor

70 mm

False floor deck 96 kg/m2

180 mm

Support on Sylodyn® false floor pad

120 mmTop concrete layer 288 kg/m2

100 mmLaminated timber ceiling 45 kg/m2

Rw 70 dB

Lnw 43 dB
CI50-2500 +2 dB

LVL ceiling with suspended substructure

17 mm

Floor covering with impact noise insulation

18 mm

Drywall panel 20 kg/m2

2 × 15 mm

Drywall panels 22 kg/m2

31 mm

LVL panel

303 mm

LVL beam support structure with void damping

93 mm

Akustik + Sylomer® ceiling hangers with substructure 1.8 kg/m2

2 × 15 mm

Drywall panels 22 kg/m2

Rw 55 dB

Lnw 53 dB
CI50-2500 +12 dB

The listed values are partly out of databases and can be even better in reality.
Sources: Schallschutz im Holzbau, Holzbauhandbuch [Sound control in timber construction, Timber construction handbook], Informationsdienst Holz
Schalltechnische Sanierung, Holzbalkendecken gezielt auf Vordermann bringen [Acoustic renovation, knocking timber beam ceilings into shape], Mikado plus 3/2008
Deckenkonstruktionen für den mehrgeschossigen Holzbau, Schall- und Brandschutz [Ceiling structures for multi-storey timber buildings, Sound control and fire
prevention], Holzforschung Austria
lignumdata.ch; dataholz.eu; opensourcewood.com; lignatur.ch; rigips.at38

Example calculation for asolid timber construction

Wall 3

Assessedroom

Wall 4

To demonstrate the effect of flanking noise insulation, an example calculation for a solid timber construction was performed on
the basis of the simplified calculation method according to EN
12354 using the flanking sound reduction index computed in thelaboratory (see page 9).

Wall 2

Acoustic certification according to EN 12354-1 and EN 12354-2

Wall 1The scenario envisaged two rooms located on top of each otherin the corner of a multi-storey dwelling built of solid timber. The
room dimensions are 4 × 3 m. The building façade was ignoredwith regard to flanking transmission from the upper to the lower
room.

Separating component (ceiling):
55 mm floating screed, 110 kg/m2
30 mm impact noise insulation, 6 MN/m2
60 mm chippings, 84 kg/m2
200 mm solid timber ceiling, 94 kg/m2(Lnw = 48 dB | Rw = 67 dB)
With elastically suspended ceiling as option, 32 kg/m2

Flanking components (external walls):
Planked on the inside with 80 mm solid timber, 47 kg/m2
The façade on the outside was ignored(Rw = 35 dB)

Flanking components (internal walls):
Planked on both sides with 80 mm solid timber, 69 kg/m2(Rw = 37 dB)
As an additional sound control solution, elastic flank decoupling
was initially installed on top of the ceiling. In a subsequent step,
it was also placed underneath the ceiling and a suspended ceiling installed.
The classification defined in DEGA recommendation 103 wasused for the qualitative assessment (see page 6). In practice, thisassessment should be made according to the respective projectspecific requirements and/or national regulations.

Fig. 8: Impact and airborne noise transmission paths using apartition wall as an example

In the following calculation, the individual transmission paths forall existing internal and external walls, together with the directtransmission, were computed and cumulated.
In other words, the calculated impact noise level – shown in bluein Fig. 8 – is derived from the total of the four flanking transmission paths (all four wall elements), plus the direct transmission
through the actual partitioning element.
In order to arrive at a computed result for airborne noise transmission – shown in red – a total of twelve transmission paths via
the flanks (all four wall elements, each with three potential transmission paths) have to be considered in addition to the direct
sound transmission.
The formulae on page 9 and the corresponding project details
were used for this purpose. See page 42 for the results in diagrammatic form.
39

Example calculation for asolid timber construction

Simplified procedure as per EN 12354-1 and EN 12354-2: Increased sound control

Airborne noise
One transmission path was calculated for example purposes and added to the results of the other transmission paths.

The rated sound reduction index for the ‘ceiling-wall 1’ transmission path is calculated as follows:

12.0 m2
RD1,w = 48.0 dB + 37.0 dB + 19.0 dB + 25.5 dB + 10lg
= 91.8 dB
2
1.0 m • 4.0 m
The results for all ‘ceiling-wall’ transmission paths are as follows:

RD1,w = 91.8 dB
RD2,w = 93.0 dB
RD3,w = 89.8 dB
RD4,w = 91.0 dB

The cumulated rated sound reduction index for the ‘ceiling-wall’ transmission path is calculated as follows:(-RDf,w

Sum RDf,w = –10 log ∑ 10 10)= –10 log (10-91.8 dB10

+ 10-93.0 dB10

+ 10

-89.8 dB10

+ 10-91.0 dB10

) = 85.2 dB

The results for all cumulated ‘ceiling-wall’, ‘wall-ceiling’,‘wall-wall’, and ‘ceiling-ceiling‘ transmission paths are as follows:

RDd,w = 80.0 dB
Sum RDf,w = 85.2 dB
Sum RFd,w = 88.7 dB
Sum RFf,w = 71.4 dB

The cumulated rated sound reduction index for the ‘ceiling-wall’ transmission path is calculated as follows:(R‛w = –10 log 1040-80.0 dB10

+ 10-85.2 dB10

+ 10

-88.7 dB10

+ 10-71.4 dB10

) ≈ 71 dB

Impact noise
One transmission path was calculated for example purposes and added to the results of the othertransmission paths.

The rated normalised impact noise level for the ‘ceiling-wall 1’ transmission path is calculated as follows:

12.0 m2
Ln,D1,w = 74.0 dB – 26.0 dB + 48.0 – 37.0 – 0.0 dB – 25.5 dB – 10 log= 23.2 dB
2
1.0 m • 4.0 m
The results for all ‘ceiling-wall’ transmission paths are as follows:

Ln,D1,w = 23.2 dB
Ln,D2,w = 22.0 dB
Ln,D3,w = 25.2 dB
Ln,D4,w = 24.0 dB

The cumulated normalized impact sound pressure level for the ‘ceiling-wall’ transmission path is calculated
as follows:(

Ln,Df,w

Sum Ln,Df,w = 10 log ∑ 10 10)= 10 log (1023.2 dB10+ 10

22.0 dB10+ 1025.2 dB10+ 10

24.0 dB
10) = 29.8 dB

The results for all cumulated ‘ceiling-wall’, ‘wall-ceiling’,‘wall-wall’, and ‘ceiling-ceiling‘ transmission paths are as follows:

Ln,Dd,w = 33.0 dB
Sum Ln,Df,w = 29.8 dB

The overall normalized impact sound pressure level is thus derived by adding together all transmission paths
as follows:(L‛n,w = 10 log 1033.0 dB10+ 10

29.8 dB10)dB ≈ 35 dB

41

Example calculation for asolid timber construction

Low sound control
Result without flank decoupling and nosuspended ceiling:
Rated sound reduction index R‘w∑ 54.3 dB

Impact noise L’n,w

48.0 dB

67.0 dB∑ 73.3 dB∑ 41.7 dB

R’w = 52 dB

Class E

L’n,w = 49 dB

Class D

Requirements for the legal minimum levelof sound control generally not satisfied.
Disturbance caused by sound transmission
from the room above is to be expected.

∑ 57.3 dB

Average sound control
With flank decoupling above, no suspended
ceiling:
Rated sound reduction index R‘w∑ 69.5 dB

Impact noise L’n,w

48.0 dB

67.0 dB∑ 43.7 dB∑ 71.3 dB

R’w = 63 dB

Class B

L’n,w = 49 dB

Class D

Requirements for the legal minimum levelof sound control generally satisfied. Noisefrom the room above will still be audible
every now and then.

∑ 69.3 dB

Increased sound control
With flank decoupling above and below,
with suspended ceiling:
Rated sound reduction index R‘w∑ 85.2 dB∑ 71.4 dB

42∑ 88.7 dB

80.0 dB

Impact noise L’n,w∑ 29.8 dB

33.0 dB

R’w = 71 dB

Class A

L’n,w = 35 dB

Class A

Increased level of sound control provided.
Everyday noises from the room above do
not disturb or can usually no longer beheard.

ConclusionM

ore stringent sound control requirements in timber construction have led to the development of high-quality walland ceiling structures. The higher the level of the partitioning
elements, the greater the importance of efficient acoustic decoupling of the flanking elements, as we were able to demonstrate inan example calculation.
The method adopted to calculate the level of required noise insulation, including the flanking elements, is described in EN 12354.
The vibration reduction index Kij specified in the standard defines
the effectiveness of the flank decoupling. A series of comprehensive measurements using Sylodyn® insulating strips was carriedout, from which Kij values for all existing transmission situations
could be derived.
The Kij values to be applied should take account of the effect of
the fasteners used. Investigations into the effect of the fastening showed hardly any reduction in effectiveness when carefully installed, elastically decoupled screws were used. In the caseof rigid fasteners, by contrast, a reduction of 35% was measured;
even the use of an occasional rigid screw produces discernible
sound bridges and consequently has an adverse effect on vibration reduction.

Getzner Werkstoffe GmbHetzner Werkstoffe was founded in 1969 as a subsidiaryof Getzner, Mutter & Cie. Its headquarters are in Buers,
Austria.
We are proud to be the leading global specialist in vibration isolation in the railway, construction and industry sectors.
Our innovative products are based on the materials we havedeveloped in-house, such as Sylomer®, Sylodyn® and Sylodamp®, and are complemented by elastic modules like Isotop. They effectively reduce vibrations and noise, improve theapplication suitability and extend the service life of the bedded
components.
Alongside three further locations in Germany, Getzner also has
offices in Australia, China, France, India, Japan and the USA. Itsinternational network is complemented by sales partners in 40
other countries.

Timber construction references (extract)— Temporary premises of the Austrian parliament,
Vienna (AT)— Asunto Oy Seinäjoen Mäihä (FI)— Five-storey dwelling, Joensuu (FI)— Sonnenzone residential complex, Mondsee (AT)— Nursery, Lofer (AT)— Eight-storey building, Residence Dezobry,
St. Dié des Vosges (FR)— Egenes Park, Stavanger (NO)— Lykseth Eiendom AS, Moelven (NO)— Hall of residence, UDQ Hamburg (DE)— Klintbacken, Luleå (SE)— Living modules, Drespitz, Basel (CH)— Asylum centre, Zihlacker, Zurich (CH)
— Messe Dornbirn (AT)— Hall of residence, CROUS du Bourget Du Lac (FR)— Alpine hotel, Ammerwald, Reutte (AT)AUSTRIA — Bürs GERMANY — Berlin — Munich — Stuttgart FRANCE — Paris — Lyon JAPAN — Tokyo
INDIA — Pune CHINA — Beijing USA — Charlotte AUSTRALIA — Melbourne
www.getzner.com

PC Sylodyn® Timber construction catalogue en © Copyright by Getzner Werkstoffe GmbH l 06-2023

G