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MCU21.0193-Att 1 Acoustic Report
Attachment 1 Acoustic Report Response to Council’s Information Request – Application for a Development Permit to Establish an Indoor Sport and Recreation Use (MCU21/0193) Shop 15, 29 Sunshine Beach Road, Noosa Heads 4567 Lot 15 on SP111607 LiFT Strength and Conditioning
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Page 2
18 January 2022
Reference: 2022001 L01A 29 Sunshine Beach Road, Noosa Heads VIB.docx
ATTN: Chad O’Brian
CO & KN Pty Ltd
87 Ridgeview Drive
Peregian Springs QLD 4573
Dear Chad,
RE: Gym Vibration Assessment – Lift Strength and Conditioning
1. Introduction
This letter provides the results of a noise investigation assessment of vibration and airborne
noise transmission between the existing Life Strength and Conditioning and the neighbouring
tenancies BBC Cinema Noosa and Davidson Hair. Measurements were conducted by Acoustic
Works on 12 January 2022 to determine the extent of vibration impacts from weight drops
and airborne noise transmission from speakers to the neighbouring tenancies.
2. Testing
2.1 Vibration Testing
Vibration levels between the tenancies were tested by measuring various weight drops from
the standard weight drop areas and measuring it at the closest point within the neighbouring
tenancy.
The following acoustic floor samples were tested:
1. SMAI Rubber Gym Flooring 15mm thick
2. Single Layer Regupol 4080
3. Double Layer Regupol 4080
To facilitate the assessment and to determine the attenuation of vibration from the tested floor
samples, a 25kg dumbbell was dropped repeatedly on each sample.
The samples were situated at locations ‘1’ (shown in Figure 1) in order to determine noise
impacts from the floor system and determine the suitability of the free weight area.
Measurements were taken in locations A, B and C within the nearest tenancies. The nearby
tenancies with the highest possibility of being impacted are:
i. Davidson Hair, located to the east of the gym on the same level (ground).
ii. BCC Cinema Noosa – Foyer, located to the west of the gym on the same level
(ground).
iii. BCC Cinema Noosa – Cinema 1, located above and to the west of the gym on level
1.
Acoustic Works, 2/8 Castlemaine St, Coorparoo QLD 4151 Internet: www.acousticworks.com.au
P.O. Box 1271 Coorparoo DC 4151 Phone (07) 3393 2222 Email: [email protected]
ABN: 56 157 965 056 [email protected]
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Figure 1: Gym Site Plan, Davidson Hair and BCC Cinema Noosa – Foyer (Ground Floor)
N
1
BCC Cinema
Noosa – B
Foyer
Entry
A
Davidson
Hair
Entry
Entry
1 Weight Drop Locations
A Measurement Locations
Speaker Locations and Orientation
Acoustic Works 2/8 Castlemaine St, P.O. Box 1271 Coorparoo DC QLD 4151 Phone (07) 3393 2222 Page 2
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Figure 2: BCC Cinema Noosa – Cinema 1 Plan (Level 1)
Screen N
Emergency
Exit Doors C
Entry
A Measurement Locations
Acoustic Works 2/8 Castlemaine St, P.O. Box 1271 Coorparoo DC QLD 4151 Phone (07) 3393 2222 Page 3
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2.1 Airborne Noise Testing
An airborne noise transmission loss test was conducted across the intertenancy wall between
the gym, Davidson Hair and BCC Cinema Noosa - Foyer. This test was conducted by playing
pink noise through the common tenancy wall and measuring the reduction in noise to the
hairdresser and the cinema. The results determine the acoustic rating of the wall system and
so determine the potential noise impacts of weight drops, music and voices from the gym, and
any particular issues related to wall construction.
2.1.1 Methodology
The acoustic wall testing procedures were carried out in general accordance with the following
standards;
• AS/NZS ISO 140.4:2006 Acoustics – Measurement of sound insulation in buildings and
of building elements Part 4: Field measurements of airborne sound insulation between
rooms (ISO 140-4:1998, MOD)
• AS/NZS ISO 717.1:2013 Acoustics - Rating of sound insulation in buildings and of
building elements Part 1: Airborne sound insulation.
• AS1045 - 1988 Method of Measurement of Absorption Coefficients in a Reverberation
Room
2.1.2 Equipment
The equipment used to perform the wall transmission loss testing comprised of the following:
• Norsonic Nor140 Sound Level Meter.
• Pulsar Instruments Model 106 Acoustic Calibrator.
• Electro Voice ETX15P 2000 Watt loudspeaker.
• Sony Walkman MP3 player (Generating Pink Noise)
Acoustic Works 2/8 Castlemaine St, P.O. Box 1271 Coorparoo DC QLD 4151 Phone (07) 3393 2222 Page 4
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3. Davidson Hair Test Results
To test the floor samples, a 25kg dumbbell was dropped repeatedly in a manner that would
be expected during operation. Weight drops were conducted in the centre of the proposed
gym area on the existing floor on each sample and then measured at the respective sensitive
receivers.
The results of the measurements from the Davidson Hair are presented in the table below:
Table 1: Results of Free Weights (Davidson Hair)
Receiver Background Floor Test Lmax Vibration
Drop Area Audibility
Room L90 (dBA) Sample Scenario (dBA) impact
SMAI
Rubber 25kg Clearly
56 Moderate
Gym Dumbbell Audible
Flooring
Centre of
Single Layer
proposed gym 25kg
Davidson Hair 39 Regupol 46 Moderate Audible
floor Dumbbell
4080
(Location 1)
Double
Layer 25kg Just
41 Minor
Regupol Dumbbell Audible
4080
Weight drops from the 25kg Dumbbell conducted on proposed flooring and Single Layer
Regupol 4080 produced significant noise and vibration impacts to the adjacent tenancy,
primarily through the floor. When testing a double layer of Regupol 4080, noise and vibration
impacts to the Davidson Hair were substantially reduced.
Tests conducted on all samples were still audible at the measurement location due to structural
vibration primarily through the floor.
3.1 Wall (Airborne Noise) Test Results
An airborne noise transmission test was conducted through the intertenancy wall. The results
of the wall testing are presented in Table 2 as follows;
Table 2: Wall Transmission Loss Test Results
Source Receiver DnT,w Ctr DnT,w + Ctr
Lift Strength and
Davidson Hair 38 -2 36
Conditioning Noosa
The result is based on the overall composite sound transmission loss of the wall partition, plus
potential flanking over the ceiling and via the flooring. The PA system will need to be limited
to improve the subjective levels within the gym. See Section 5.2 for recommendations.
Acoustic Works 2/8 Castlemaine St, P.O. Box 1271 Coorparoo DC QLD 4151 Phone (07) 3393 2222 Page 5
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4. BCC Cinema Noosa Test Results
The results of the measurements from BCC Cinema Noosa are presented in the table below:
Table 3: Results of Free Weights (BCC Cinema Noosa)
Receiver Background Floor Test Lmax Vibration
Drop Area Audibility
Room L90 (dBA) Sample Scenario (dBA) Impact
SMAI
Rubber Clearly
57 Moderate
Gym Audible
Flooring
Free Weights
Single Layer 25kg
Area Foyer Clearly
45 Regupol Dumbbell 55 Moderate
(Location 1) Audible
4080
Double
Layer
54 Minor Audible
Regupol
4080
SMAI
Rubber Clearly
46 Moderate
Gym Audible
Flooring
Free Weights
Single Layer 25kg
Area Cinema 1
34 Regupol Dumbbell 37 Minor Audible
(Location 1) (Level 1)
4080
Double
Layer Just
35 Minor
Regupol Audible
4080
Weight drops from the 25kg Dumbbell conducted on the proposed floor SMAI Rubber
Flooring again produced significant noise and vibration impacts to the adjacent foyer and the
cinema above. The double layer of Regupol 4080 was able to significantly reduce the
vibration impact and audibility of weight drops in the foyer and cinema.
4.1 Wall (Airborne Noise) Test Results
An airborne noise transmission test was conducted through the intertenancy wall. The results
of the wall testing are presented in Table 2 as follows;
Table 4: Wall Transmission Loss Test Results
Source Receiver DnT,w Ctr DnT,w + Ctr
Lift Strength and BCC Cinema Noosa
24 -1 23
Conditioning Noosa - Foyer
The result is based on the overall composite sound transmission loss of the wall partition. As
the wall tested is a temporary tenancy wall, recommendations will be made to reduce the
noise in the neighbouring tenancy. See Section 5.2 for recommendations.
Acoustic Works 2/8 Castlemaine St, P.O. Box 1271 Coorparoo DC QLD 4151 Phone (07) 3393 2222 Page 6
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5. Discussion 5.1. Acoustic Flooring During the weight drop tests it was observed that significant structural vibration was being produced through the walls of the neighbouring Davidson Hair and BCC Cinema Noosa tenancies. Vibration through the floor was also noticed in Cinema 1 at BCC Cinema Noosa, located above and to the west the gym. The issues are primarily related to the lack of stiffness and inherent flexibility of the floor structure. These problems with the slab are inherent to the structure and would require a significant amount of work to improve given the large size of the building. To achieve the minimum noise and vibration impact to neighbouring tenancies, the most effective solution for the gym floor would be a double layer of Regupol 4080. This system would not make all activities inaudible at the neighbouring tenancies, and there is still a potential for adverse impacts. Refer to Section 5.3 for methods to further reduce vibrational impacts to tenancies. 5.2. Airborne Noise Transmission and Speakers The current intertenancy wall between the gym and the cinema foyer consists of a temporary wall with a single sheet of 10mm plywood. The airborne noise transmission test conducted during the site visit and shown in Table 4 was not an accurate representation as to the wall construction will change during the fit-out. The builder has informed us they will likely be installing 6.38lam glazing throughout the intertenancy wall. Therefore, the estimated impacts below are based on the intertenancy wall being constructed with 6.38lam glazing, acoustic seals and 13mm plasterboard. It is recommended to have an additional test done after the gym is fully constructed to ensure an accurate noise level is implemented within the gym. With the hairdresser's current intertenancy wall system and the cinema's proposed wall system it is recommended that to minimise noise impacts to the neighbouring tenancies, a noise level of approximately 70dBA is achieved within the gym, including music and speech from patrons. If a higher noise level is desired, the wall system between the gym and hairdresser must be improved. An improvement in the rating would allow an identical increase in the allowable noise levels inside, e.g., 10 rating points would increase the allowable noise levels inside by 10dB. For a satisfactory noise level, it is encouraged that the client proactively discusses impacts with the neighbours. To reduce impacts further, it is also recommended that any installed speakers are to face away from adjoining tenancies, not located on intertenancy walls and/or should be isolated from the structure using a spring isolation system with a minimum static deflection of 25mm. Acoustic Works 2/8 Castlemaine St, P.O. Box 1271 Coorparoo DC QLD 4151 Phone (07) 3393 2222 Page 7
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5.3. Noise Management Plan
5.3.1. Gym Activities – Free Weight Area
Although a floor system will be installed for the free weight area, it does not mean that
occupants of the gym can drop weights without the potential for impacts to the adjoining
tenancies. For the new floor isolation system to be successful, management of the free weights
area will be required. Suitable operation of the gym shall require the following management
controls:
1. Signage shall be placed within the free weights area to inform club members that the
dropping of heavy weights on the floor is not allowed and should include a notice that
behaviour will be monitored by the surveillance system.
2. Members shall be instructed about the appropriate behaviour within the free weights
area and shall include specific instruction on handling weights and placing them on
the floor in place of dropping.
3. Staff shall be trained to be vigilant and monitor the free weight area and shall
intervene if a member does not handle the free weights correctly, firstly providing
instruction if required or reprimanding the non-compliant member.
5.3.2. Responsible Person
1. The gym shall nominate a person (senior staff member) who is onsite during normal
operating hours and is available outside of normal hours to implement and manage
the noise management plan.
5.3.3. Responsible Person – Duties
1. The “Responsible Person” is required to receive, document and respond in an
appropriate manner to complaints regarding the gyms operation with regards to noise.
2. The “Responsible Person” shall ensure commercial tenants of the building have their
contact details in the event of complaints.
3. The “Responsible Person” shall regularly review the Noise Management Plan (NMP)
and ensure the NMP continued implementation for the site. They shall review the plan
performance based on aforementioned indication including comments from staff,
patrons and tenants in the building.
4. The nominated person shall be responsible for documenting changes and
modifications to the NMP.
5. The responsible person shall ensure that staff and patrons actively support the noise
Management plan and its continued use for the Gym.
6. The “Responsible Person” shall ensure the NMP is available for all patrons upon
request and post the relevant sections in locations within the gym for patrons and
staff to view.
Acoustic Works 2/8 Castlemaine St, P.O. Box 1271 Coorparoo DC QLD 4151 Phone (07) 3393 2222 Page 8
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7. Staff shall be educated about the requirements of the NMP and action required
regarding complaints.
8. The “Responsible Person” shall contact commercial tenants monthly to ensure that
their contact details are available and there are no issues or complaints regarding the
gym.
5.3.4. Complaints
1. Commercial tenants in the immediate vicinity of the gym shall be provided with
contact details of the “Responsible Person” in the event of a noise complaint.
2. The “Responsible Person” shall maintain a log of all complaints with the following
information:
• Time and date of the complaint.
• Contact details of the complainant.
• The source of the complaint including a description of the source and how it
was rectified or if further investigation is required by an acoustic consultant.
3. In the event of a complaint, the “Responsible Person” shall respond in the appropriate
and friendly manner and investigate the source. They will then take action to rectify
the matter if the complaint is reasonable. During the process a log shall be kept to
document the process.
4. The “Responsible Person” shall regularly contact the complainant to advice on the
progress or resolution of the noise issue and how it has been or will be resolved.
If the complaint is ongoing an acoustic consultant shall be engaged to determine any control
measures required.
Acoustic Works 2/8 Castlemaine St, P.O. Box 1271 Coorparoo DC QLD 4151 Phone (07) 3393 2222 Page 9
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6. Disclaimer Note the recommendations within the report are to achieve the acoustic requirements only, and do not consider onsite safety issues in relation to the materials which is the responsibility of gym management. 7. Conclusion On the condition the recommended solutions stated in Sections 5 and 6 are adopted, it is our opinion that the gym is predicted to operate within the centre while minimising impacts to the adjoining tenants. In addition, we recommend the gym takes a proactive approach with neighbouring tenants to ensure that any potential issues are managed. This could be achieved by providing contact details to the other tenants and addressing any issues that arise. Regarding the remaining floor areas, it is recommended that the appropriate flooring is used to minimise impacts to the adjoining tenancies and isolation is used under the gym equipment. We trust this information meets with your current requirements. Should you have any queries please do not hesitate to contact us. Yours faithfully, Kayleigh Duce Acoustic Consultant Acoustic Works 2/8 Castlemaine St, P.O. Box 1271 Coorparoo DC QLD 4151 Phone (07) 3393 2222 Page 10
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