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Earcon Acoustics Limited, Level 26, PWC Tower - 188 Quay St - Auckland www.earcon.co.nz 09 443 6410 Info@earcon.co.nz
Acoustic Assessment
INZIDE Flooring Systems on Concrete Intertenancy Floor
Date: 7th February 2020 Prepared for: INZIDE Prepared by: Earcon Acoustics Limited Reference: J003781
Earcon Acoustics Limited, Level 26, PWC Tower - 188 Quay St - Auckland www.earcon.co.nz 09 443 6410 Info@earcon.co.nz
Document Control
INZIDE
J003781
Contact Issue Date Rev
Alex Jacob
Alex.jacob@earcon.co.nz
021 572 518
For Internal Review 07/02/2020 A
Fadia Sami
Fadia.sami@earcon.co.nz
021 437 893
For Client Review 07/02/2020 A
Earcon Acoustics Limited, Level 26, PWC Tower - 188 Quay St - Auckland www.earcon.co.nz 09 443 6410 Info@earcon.co.nz
Table of Contents 1 Introduction ............................................................................................................................. 1
2 Site Tests .................................................................................................................................. 1
2.1 Test Conditions ................................................................................................................ 2
2.2 Tested Flooring Samples ................................................................................................. 3
3 Field Measurements ................................................................................................................ 3
3.1 Field measurement of airborne sound insulation (FSTC) ................................................ 3
3.1.1 STC Definition (Sound Transmission Class) .............................................................. 3
3.1.2 Verification Method G6/VM1 for Airborne Sound Insulation Field Tests ................ 3
3.2 Field measurement of impact sound insulation (FIIC) ..................................................... 4
3.2.1 IIC Definition (Impact Insulation Class) .................................................................... 4
3.2.2 Verification Method G6/VM1 for Impact Sound Insulation Field Tests ................... 4
4 Compliance Criteria – NZ Building Code .................................................................................. 4
5 Methodology ........................................................................................................................... 5
5.1 Standards ........................................................................................................................ 5
5.2 Requirement ................................................................................................................... 5
5.2.1 Airborne Sound Insulation ....................................................................................... 5
5.2.2 Impact Sound Insulation .......................................................................................... 5
5.3 Equipment ....................................................................................................................... 6
5.4 Measurements ................................................................................................................ 6
6 Results - Building Construction ................................................................................................ 7
6.1 Airborne Sound Insulation – Bare Concrete Floor ........................................................... 7
6.2 Impact Insulation – Bare Concrete Floor ......................................................................... 8
7 Results - Flooring Systems ....................................................................................................... 9
7.1 Interface CushionBac Carpet Tile – Stand alone ............................................................. 9
7.2 Interface Carpet Tile on Sarlibase Acoustic Underlay.................................................... 10
7.3 Tessera Carpet Tile on Sarlibase Acoustic Underlay ...................................................... 11
7.4 Sphera Sheet Vinyl on Sarlibase Acoustic Underlay ...................................................... 12
7.5 Eternal Sheet Vinyl on Sarlibase Acoustic Underlay ...................................................... 13
7.6 Marmoleum Sheet on Sarlibase Acoustic Underlay ...................................................... 14
Earcon Acoustics Limited, Level 26, PWC Tower - 188 Quay St - Auckland www.earcon.co.nz 09 443 6410 Info@earcon.co.nz
7.7 Interface LVT on Sarlibase Acoustic Underlay ............................................................... 15
7.8 Surestep Safety Vinyl on Sarlibase Acoustic Underlay................................................... 16
7.9 Sarlibase Acoustic Underlay .......................................................................................... 17
7.10 Forbo Allura Vinyl Tile ................................................................................................... 18
7.11 Interface Vinyl Tile ......................................................................................................... 19
8 Summary ................................................................................................................................ 20
9 Conclusions ............................................................................................................................ 21
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1 Introduction INZIDE Commercial is an established, NZ based provider of flooring systems to the construction
industry. As part of INZIDE’s commitment to the quality of flooring systems, an acoustic assessment
was commissioned to assess the effectiveness of different flooring systems in attenuating impact
noise, when installed on a typical concrete intertenancy floor in a multi-storey building. This report
details the tests, results and analysis pertaining to the assessment of the acoustic qualities of the
systems in this report.
The brand names of the systems, are reported in this report as advised by INZIDE. Associated
copyrights or trademarks are the responsibility of INZIDE.
2 Site Tests Tests were performed in-situ, within a multi-storey concrete apartment building currently under
construction, to simulate commonplace apartment building structures used in New Zealand.
Tests were conducted on the 14th of January 2020, within the building under construction at 19 Dunn
Road, in Panmure, Auckland. The building was in the latter stages of construction, and the rooms where
testing was undertaken on the 4th and 3rd floor, were complete with internal 10mm Plasterboard Wall
lining and 13mm Plasterboard ceiling lining, and with internal and external doors and glazing installed.
The internal lining however still had unsealed penetrations as shown in the figure below from the
receiver room 308.
Figure 1 – Test Receiver Room 308.
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2.1 Test Conditions
The building was an active construction site, and while all efforts were made to minimise noise
intrusion, the tests were nonetheless in-situ and not to be interpreted as laboratory tests. It would be
reasonable to expect the same tests, if conducted under a more acoustically sterile laboratory, would
result in higher performance measures. Based on this, we note that the results in this report are
representative of real-world performance of the subject flooring systems tested in combination with
the construction of the building. The same flooring systems are likely to exhibit different impact
insulation characteristics when installed on a floor/ceiling of different construction.
The floors of the subject apartments were bare concrete, and the systems tested were installed on a
designated part of the living rooms of apartments 408 and 405, and sound insulation was then
measured to the corresponding living rooms of apartments 308 and 305 directly below the installed
flooring systems. The samples installed were at least 2mx2m at the upper floor apartments.
Subsequent tests involved the removal of one flooring system and installation of another. Installations
were performed by INZIDE specialists in a manner representative of actual installations. An example
of an installation is shown below:
Figure 2 – Sample Installation
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2.2 Tested Flooring Samples
Baseline reference tests were also conducted with the bare concrete floor:
1. Airborne Sound Insulation of floor construction with bare concrete floor.
2. Impact Sound Insulation on bare concrete
Acoustic tests were conducted on the following flooring trade references:
1. Interface CushionBac carpet tile – Stand alone
2. Interface carpet tile on Sarlibase acoustic underlay
3. Tessera carpet tile on Sarlibase acoustic underlay
4. Sphera Sheet Vinyl on Sarlibase acoustic underlay
5. Eternal Sheet Vinyl on Sarlibase acoustic underlay
6. Marmoleum Sheet on Sarlibase acoustic underlay
7. Interface LVT on Sarlibase acoustic underlay
8. Surestep Safety Vinyl on Sarlibase acoustic underlay
9. Sarlibase acoustic underlay
10. Forbo Allura Vinyl Tile
11. Interface Vinyl Tile
3 Field Measurements
3.1 Field measurement of airborne sound insulation (FSTC)
3.1.1 STC Definition (Sound Transmission Class)
A single number derived from measured values of transmission loss in accordance with classification
ASTM E 413. The STC rating is given by the value of the contour at 500 Hz.
3.1.2 Verification Method G6/VM1 for Airborne Sound Insulation Field Tests
The performance for airborne sound insulation may be verified using the procedures detailed in ASTM
E 336, and the field sound transmission class may be verified using the method described in ASTM E
413. Field test results shall be within 5dB of the performance requirement.
• Noise source: Loudspeakers radiating broadband random noise.
• Sound level meter: Calibrated B&K 2270 Type 1 integrating sound level meter with 1/3 octave
band real-time analyser.
• Test method: ISO 140-4.
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• Test procedure: pink noise was generated in the source room using an amplifier and speaker,
then the sound level was measured in both the source and receiving room in 1/3 octave
bands. We also measured the reverberation time and background noise levels in the receiving
room.
• Rating method: ASTM E 413 and ISO 717-1.
3.2 Field measurement of impact sound insulation (FIIC)
3.2.1 IIC Definition (Impact Insulation Class)
A single number derived from measured values of transmission loss in accordance with classification
ASTM E989-89. The STC rating is given by the value of the contour at 500 Hz.
3.2.2 Verification Method G6/VM1 for Impact Sound Insulation Field Tests
The performance for impact sound insulation may be verified using the procedures detailed in ISO 140:
Part VII, and the field impact insulation class may be verified using the method described in ASTM E
989. Field test results shall be within 5dB of the performance requirement.
• Noise source: Tapping Machine.
• Sound level meter: Calibrated B&K 2270 Type 1 integrating sound level meter with 1/3 octave
band real-time analyser.
• Test method: ISO 140-4: Part VII.
• Test procedure: the noise was generated in the source room using a tapping machine, then
the sound level was measured in both the source and receiving room in 1/3 octave bands. We
also measured the reverberation time and background noise levels in the receiving room.
• Rating method: ASTM E989-89 and ISO 717-2.
4 Compliance Criteria – NZ Building Code STC (Sound Transmission Class) 55 and IIC (Impact Insulation Class) 55 ratings are required between
the inter-tenancy floors and walls to prevent undue noise transmission from other occupancies or
common spaces to the habitable spaces of the household units. The STC and IIC ratings are required
for common walls and floors of different tenancies. The code allows 5dB for field situation; i.e., FSTC
50 and FIIC 50 in situ, where the letter “F” in the designation refers to “Field”
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5 Methodology
5.1 Standards
The following details the testing methodology for the calculation of insulation of airborne sound
through external facades. The levels of insulation are represented by the calculated Weighted
Apparent Sound Reduction Index R’w / Field Sound Transmission Class (FSTC) in accordance with
• ISO 16283-1:2014 - Acoustics -- Field measurement of sound insulation in buildings and of building elements -- Part 1: Airborne sound insulation
• ISO 16283-2:2015 - Acoustics -- Field measurement of sound insulation in buildings and of building elements -- Part 2: Impact sound insulation
• ISO 140-5:1998(E) - Measurement of sound insulation in buildings and of building elements -- Part 4: Field measurements of airborne sound insulation between rooms
• ISO 140-7:1998 - Acoustics -- Measurement of sound insulation in buildings and of building elements -- Part 7: Field measurements of impact sound insulation of floors
• ISO 3382-2:2008: Acoustics -- Measurement of room acoustic parameters -- Part 2: Reverberation time in ordinary rooms
5.2 Requirement
5.2.1 Airborne Sound Insulation
The procedures in the ISO standards above are used in determining the airborne sound insulation of a
floor or wall using sound pressure measurements. These procedures are intended for room volumes
in the range from 10 m3 to 250 m3 in the frequency range from 50 Hz to 5000 Hz. The measured
airborne sound insulation is frequency-dependent and can be converted into a single number quantity
to characterize the acoustic performance using the rating procedures in ISO 717-1.
5.2.2 Impact Sound Insulation
The procedures in the ISO standards above are used in determining the impact sound insulation of a
floor using sound pressure measurements. These procedures are intended for room volumes in the
range from 10 m3 to 250 m3 in the frequency range from 50 Hz to 5000 Hz. The measured impact
sound insulation is frequency-dependent and can be converted into a single number quantity to
characterize the acoustic performance using the rating procedures in ISO 717-2
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5.3 Equipment
The following equipment was used in the measurements required for the calculation of R’w / Field
Sound Transmission Class (FSTC) and Field Impact Insulation Class (FIIC)
• Sound Level Meter: Type 1 B&K 2270 - 1/3 octaves from 50Hz to 5kHz.
• Tapping Machine: B&K Type 3207 Impact Sound Generator
• Speaker: B&K OmniSource Type 4295
• Amplifier: B&K Type 2734
Calibration certificates are attached in Appendix I
5.4 Measurements
For the calculation of FSTC / FIIC through a floor, the following measurements are taken:
• Receiving Room Background Measurements (B2): Background measurements are made in
the receiving room and are used to correct the receiving levels for the background noise.
Several B2 measurements should be taken at different locations in the receiving room. These
measurements are taken around the same time of the receiving levels measurements.
Measurements are taken with no sound from the speakers or the tapping machine, and for
10 seconds each reading. These readings are repeated 3 times at different points in the
receiving room.
• Reverberation Time (T2): This is the decay time for sound in a room after an excitation stops.
It is defined as the time for a 60dB drop in level. It can however be evaluated over a 20dB or
30dB drop using regression lines. This measurement is repeated several times in the
receiving room and at different locations in the room. This is to allow for spatial variations in
the room.
• Source Level Measurements (L1): This measurement is taken within the sound source area
and with the sound source generating the required Pink noise or impact noise. Several
measurements are taken with the sound level meter in different locations depending on the
shape and contents of the area. Pink Noise is generated by the B&K 2734 Amplifier through
the B&K 4295 Speaker. Impact noise is generated by the B&K Type 3207 tapping machine.
• Receiving Room Level Measurements (L2): This measurement is taken in the receiving room
and with the sound source generating the required Pink noise or Impact noise. Several
measurements are taken with the sound level meter in different locations depending on the
shape and contents of the area.
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6 Results - Building Construction
6.1 Airborne Sound Insulation – Bare Concrete Floor
The following graph shows the 1/3 Octave sound reduction for airborne noise, which yielded:
Result: FSTC 62
Figure 3 – Sound Reduction Graph - FSTC
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6.2 Impact Insulation – Bare Concrete Floor
Result: FIIC 30
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7 Results - Flooring Systems The following graphs represent the 1/3 Octave sound reduction for impact noise, for each of the tested
systems.
7.1 Interface CushionBac Carpet Tile – Stand alone
Result: FIIC 66
Figure 4 - Sound Reduction by Frequency - Test Reference #1
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7.2 Interface Carpet Tile on Sarlibase Acoustic Underlay
Result: FIIC 64
Figure 5 - Sound Reduction by Frequency - Test Reference #2
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7.3 Tessera Carpet Tile on Sarlibase Acoustic Underlay
Result: FIIC 65
Figure 6 - Sound Reduction by Frequency - Test Reference #3
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7.4 Sphera Sheet Vinyl on Sarlibase Acoustic Underlay
Result: FIIC 58
Figure 7 - Sound Reduction by Frequency - Test Reference #4
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7.5 Eternal Sheet Vinyl on Sarlibase Acoustic Underlay
Result: FIIC 57
Figure 8 - Sound Reduction by Frequency - Test Reference #5
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7.6 Marmoleum Sheet on Sarlibase Acoustic Underlay
Result: FIIC 58
Figure 9 - Sound Reduction by Frequency - Test Reference #6
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7.7 Interface LVT on Sarlibase Acoustic Underlay
Result: FIIC 57
Figure 10 - Sound Reduction by Frequency - Test Reference #7
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7.8 Surestep Safety Vinyl on Sarlibase Acoustic Underlay
Result: FIIC 59
Figure 11 - Sound Reduction by Frequency - Test Reference #8
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7.9 Sarlibase Acoustic Underlay
Result: FIIC 56
Figure 12 - Sound Reduction by Frequency - Test Reference #9
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7.10 Forbo Allura Vinyl Tile
Result: FIIC 55
Figure 13 - Sound Reduction by Frequency - Test Reference #10
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7.11 Interface Vinyl Tile
Result: FIIC 55
Figure 14 - Sound Reduction by Frequency - Test Reference #11
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8 Summary The following table is a summary of FSTC and FIIC values for the different combinations of flooring:
Type Configuration Result Building
Code Status
Airborne Bare Concrete Floor FSTC 62 FSTC 50 Pass
Impact Bare Concrete Floor FIIC 30 FIIC 50 N/A
Impact Interface CushionBac carpet tile – Stand alone FIIC 66 FIIC 50 Pass
Impact Interface carpet tile on Sarlibase acoustic underlay FIIC 64 FIIC 50 Pass
Impact Tessera carpet tile on Sarlibase acoustic underlay FIIC 65 FIIC 50 Pass
Impact Sphera Sheet Vinyl on Sarlibase acoustic underlay FIIC 58 FIIC 50 Pass
Impact Eternal Sheet Vinyl on Sarlibase acoustic underlay FIIC 57 FIIC 50 Pass
Impact Marmoleum Sheet on Sarlibase acoustic underlay FIIC 58 FIIC 50 Pass
Impact Interface LVT on Sarlibase acoustic underlay FIIC 57 FIIC 50 Pass
Impact Surestep Safety Vinyl on Sarlibase acoustic underlay FIIC 59 FIIC 50 Pass
Impact Sarlibase acoustic underlay FIIC 56 FIIC 50 Pass
Impact Forbo Allura Vinyl Tile FIIC 55 FIIC 50 Pass
Impact Interface Vinyl Tile FIIC 55 FIIC 50 Pass
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9 Conclusions The tests conducted on the INZIDE flooring systems on a concrete floor are representative of field
based (in-situ) results and not intended as laboratory based design performance tests. This is in
consideration of the fact the site was active with presence of background noises, in addition to
presence of open penetrations in the internal linings of the walls and ceiling in the sample
apartments where tests were conducted.
The following is concluded from the results:
• The concrete structure of the building is effective in insulation airborne noise, as would be
expected, with a measured FSTC 62. This collates with measurements conducted within
similar buildings.
• The buildings concrete structure is susceptible to impact noise transfer, as would be
expected, resulting in a low performance for the bare concrete floor of FIIC 30. This collates
with measurements conducted within similar buildings.
• The Sarlibase Acoustic Underlay is noted to be effective on its own in insulting impact noise
with an impact insulation performance measured at FIIC 56 for the underlay alone.
• With the effectiveness of the underlay taken into account, the different flooring systems atop
the underlay also performed effectively with results all above FIIC 57
• Carpets are generally expected to be more effective than solid surfaces in insulating impact
noise. This is supported in the results with all carpets tested yielding insulation levels above
FIIC 60.
We note the following:
• The results are only representative of the performance of the combination of ceiling lining,
intertenancy floor construction, and the different flooring systems. A timber floor for example
would likely exhibit different performance results to those stated here.
• For reference; subtracting the FIIC value of one system from the FIIC value of another cannot
be used to infer the performance of one part of the system present on one test and absent in
another. Each test result is only indicative of the overall combination of materials and
construction elements constituting the whole path between the source of impact on the
upper floor and the receiver on the lower floor.
• The analysis of the mechanics of noise and vibration transmission in the different
combinations of flooring, and assessment of the performance of the flooring systems on
other floor constructions are outside the scope of this report.
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Appendix I – Calibration Certificates
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