Acoustics Treatment Ac4_AppendixELV_14may07(rev.akustic)__2.pdf

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Appendix ELV to ELECTRICAL WORKS BRIEF

CAWANGAN KEJURUTERAAN ELEKTRIK IPJKR MALAYSIA 14-05-2007 ELV 1 of 26

(J) Acoustics Treatment

1.0 Introduction

This section sets out briefly the room acoustics and sound insulation requirementsfor all the intended spaces. This section will also provide suitable design criteriaessential to achieve the set criteria within the intended spaces.

The contractor shall be responsible to deliver fully functional architectural acousticsystem, which include design, supply all materials and complete installation andtesting of acoustic works.

1.1 Scope of Work

1.1.1 The specifications and requirements under this section of the Pre-Bid Documentcover the general scope of works for the Acoustic Works. The work shall include allthe Scope of Services of the Architectural Brief.

1.1.2 The Contractor shall propose, design, supply all materials equipment and laborsand perform all installation and testing works required for the complete andsatisfactory completion of the works required of the whole project, repair andreplace all defective and faulty materials, equipment and works during theGuarantee Period as specified in the Contract.

1.1.3 All materials, accessories, equipment, works etc. required for the proper andeffective performance/operation of the university, except those clearly mentioned

not necessary, shall deem to be included in the Contract.

1.1.4 The contractor shall establish acoustical design criteria and environmentalrequirement for a satisfactory acoustic environment to suit intended usage of theidentified spaces. This includes identifying and establishing the magnitude anddynamic characteristics of the background sound and character of the occupiedspace.

1.1.5 The contractor shall propose the adjacencies, partition construction and ceilingdesigns for Speech Privacy Potential.

1.1.6 The contractor shall propose the interior room finish designs for control of excessive

reverberation to achieve optimum acoustics for specific space functions.

1.1.7 The contractor shall propose the partition construction for spaces adjacent tomechanical and electrical equipment spaces inclusive of reducing transmission pathof the structure, ducts and openings.

1.1.8 The contractor shall propose the control of the transmission of unwanted sound(sound isolation and impact noise isolation) into any of the identified spacesinclusive of transmission of sound through doors, windows floors and ceiling.





1.1.9 The contractor shall co-ordinate with architects, designers and engineers for properand through incorporation of acoustical design requirements.

1.1.10 The contractor shall incorporate in their acoustical requirements the reduction ofnoise sources of mechanical and electrical equipment of but not limited to the mainair handling system designs, ductwork distribution design and drawings, terminaldevices selections, generator sets system and proposed recommendationsconcerning their acoustical acceptability that includes but not limited to the selectionof quiet equipment, proper mountings and attenuators.

1.1.11 The contractor shall submit conceptual details and materials specification asnecessary inclusive of selection and distribution of the absorptive and reflectivematerials and constructions that will provide the optimum conditions for the growth,the decay and steady state distribution of sound in the identified spaces.

1.1.12 The contractor shall submit written reports of comments and recommendations withsubstantiated calculations, technical data, recognized standards and noise surveystudies.

1.2 Scope of Services

1.2.1 The contractor shall provide proposals to assure the achievement of goodacoustical design criteria to all intended spaces in terms of their volume,architectural shaping, form etc., for best acoustical results as well as to satisfyaudiovisual sightlines.

1.2.2 The contractor shall establish Noise Criteria (NC) levels for all intended functionalspaces.

1.2.3 The contractor shall propose reverberation time of intended spaces and design theceiling, floor, walls including finishes capable of providing optimum room acousticsand reverberation characteristics.

1.2.4 The contractor shall select types of equipment, acoustical treatment, materials,construction detailing, isolation techniques etc.

1.2.5 The contractor shall submit material specifications and mounting details.

1.2.6 The contractor shall ensure high levels of speech privacy and optimum roomacoustics for speech related activity in all intended spaces.

1.2.7 The contractor shall submit acoustical isolation constructions details andspecifications including performance criteria.

1.2.8 The contractor shall submit noise and vibration control specifications for mechanicalequipment.

1.2.9 The contractor shall submit acoustical material specifications and mounting details.





1.2.10 The contractor shall perform tests to confirm that all acoustical design criteria andconstruction requirements have been met and submit reports describing the resultsof these tests.

1.2.11 The contractor shall provide the following:

a) Acoustical report outlining criteria and commentariesb) Matrices of space function and NC criteriac) Matrices of space adjacencies and STC ratingsd) Sketches and details of room finishes, walls, windows, doors, partitions,

floors, ceiling etc.

1.3 Acoustical Issue

Acoustical conditions within the intended spaces must be carefully considered to ensurethat the rooms will function satisfactory. The primary acoustical issues which need to beaddressed are:-

Background Noise

Acoustics within the space/Room acoustics

Sound Insulation:-

* Noise intrusion from adjacent spaces* Noise intrusion from ancillary spaces* Rain Noise

* Noise breakout from mechanical & electrical plant room

1.3.1 Background Noise

The background noise, in any room, is composed of continuous and intermittentsounds. Ventilation and air-conditioning noise is one of the major contributors tocontinuous background noise.

The quality of all the spaces inside this building is largely dependent on theirbackground noise levels. It is therefore imperative that background noise levels inall the spaces be controlled to realistic design levels based on its intended usage.The criteria are based on NC (Noise Criteria).

1.3.2 Acoustics within the space-Room Noise

The acoustics of a space is predominantly dictated by the volume, absorption,reflection and diffusion of the space. Whilst volume and absorption determines thereverberation of the space, reflection and diffusion improves the distribution ofsound energy within the room.





Reverberation

The reverberation of a space is described by its reverberation time (RT). Thereverberation time is defined as the time taken for a sound pressure level to decayby 60dB

Excess reverberant energy can cause lack of clarity in music and poor intelligibilityof speech. On the other hand, deficiency in reverberation can cause poor tonalquality and lack of rhythmic urge in music.

The contractor is required to recommend the required acoustic absorption withinthese spaces to achieve a resultant RT that is most desirable for its proposedfunctional usage. The RT values of the reverberation time linking to the volume andfunctional use of space.

Diffusion

A diffused sound field implies a statistical randomness in which:-

1. Sound energy is uniformly distributed.2. Direction of propagation is totally random

Although absorption is necessary in many circumstances, eliminating reflections is notalways a useful thing to do. This is of key importance in rooms where an audience islistening to a performance or lecture. In this type of room, it is desirable that all audiencemembers heat the sound not only clearly, but without preference to seating location. This

can be accomplished by reflections off side walls and ceilings. Sharp echies can beeliminated by avoiding smooth, flat, reflective surfaces and having irregular and convexsurfaces to diffuse the sound evenly throughout the audience.

1.3.3 Sound Insulation

Sound insulation treatment aims to minimize noise intrusion from external andadjacent spaces. Airborne noise and Structure borne noise shall be reduced to areasonable degree of acoustic comfort and privacy. Both air and structure bornenoise generated in or outside a room can be transferred to adjacent rooms via anumber of transmission paths e.g. roofs, ceilings, walls, windows, floors and otherfaçade elements where else structure borne noise would also be transmitted via the

building structure.

Sound insulation in-between rooms would be of primary importance to ensure thateach room functions independently and free from disruptions due to simultaneousroom use. Controlling noise intrusion in-between adjacent spaces by providingsufficient sound insulation in imperative.

Whilst the air-conditioning/ventilation noise may be controlled at source, the controlof intrusive noise from adjacent spaces will have to be provided by the walls, doors,floor and ceiling.





The Sound Transmission Class (STC) is a single descriptor used for rating thesound transmission of a partition obtained by laboratory measurements.

1.4 Design Criteria

1.4.1 NC (Noise Criteria) and RT60 (Reverberation Time)

Based on the functional requirements, the guidelines for the design criteriaappropriate for all the intended spaces and other spaces that are not mention butare deem required can be refer in Table 1 for NC and Appendix A for RT 60. Thiscriteria should therefore, be considered as invaluable guidelines for the design ofthe mechanical services installations, selection of room furnishings and equipment,specification of anti-vibration treatment and the specification of partition

performance.

1.4.2 STC Ratings

The following are guidelines of Sound Privacy Associated with STC Ratings.

STC Range Sound Privacy

0 – 2020 – 4040 – 55

55 – 65

70

No privacy (voices heard clearly between rooms)Some privacy (voices heard in low background noise) Adequate privacy (only raised voices heard in low backgroundnoise)Complete privacy (only high-level noise heard in low background

noise)Practical limit

The contractor shall ensure that all transmission paths in all intended spaces haveappropriate STC ratings.

1.5 Effective Room Acoustics Design

1.5.1 The level of the background noise must be sufficiently low to avoid interfering withthe intended activities.

1.5.2 Sound energy must be evenly distributed throughout the space.

1.5.3 Avoid echoes and focusing effects; and in small rooms having relatively little soundabsorption, avoid any shapes which might emphasize certain frequencies (e.g. theratio of any two of the length, width and height dimensions should not be a wholenumber).

1.5.4 The desired sound must be sufficiently loud. Shape room surfaces to provide usefulsound reflections. If size and space use require a sound reinforcing system,carefully integrate the system with the room acoustic design.





1.5.5 Provide the proper reverberation time characteristics. The reverberation time mustbe long enough to give proper blending of sounds, any yet short enough that thereproper separation of successive sounds necessary for concise audibility. In roomsfor both speech and music there is a natural conflict. For example, a longreverberation time is desirable for music so that successive notes blend together,giving richness. However, for speech the reverberation time should be short so thatthe persistence of one syllable does not blur or mask subsequent syllables.

1.5.6 Provide a short enough initial-time-delay-gap for early reflections. Initial-time-delay-gap should be less than 30 milliseconds (i.e. sound path difference of less than 34ft) to provide useful reinforcement of the direct sound.

1.6 Typical Acoustics Room Finishes

Room finishes can be designed to affect acoustics in three difference ways: absorption,reflection and diffusion.

1.6.1 Wall Panel

a. Wall panel will typically be 100mm/50mm/25mm thick fiberglass(72kg/m3) with a facing of either perforated sheet metal or stretchedfabric depending on the architectural requirements. A UPVC tracksystem shall be used for stretching fabrics over walls and panels. All acoustic lining (fiberglass) shall meet BS476 Pt. 6 and Pt. 7 Class0 fire requirements of the Building regulations. The fabrics shall be

woven and acoustically transparent and to meet Class 1 or 0 firerequirements of the Building Regulations.

b. Wall panel will typically be 19mm thick plywood slot on a100mm/50mm thick fiberglass (48kg/m3).

c. Wall panel will typically be 160mm deep diffuser panels. Thediffuser shall be flushed/recessed mounted.

1.6.2 Walls

The sound insulation properties of the walls within an enclosed space is

critical and determined by various factors namely its material constituence,type and configuration of its erection. The contractor shall prepare a set ofmarked up wall types on the architectural drawings and attached togetherwith his acoustic report.

a. 220mm/100mm brick wall plastered on both sides.

b. 2 layers of 15mm/12mm gypsum/plaster board on steel studs,250mm airgap with 50mm 32kg/m3 fibreglass in the cavity and110mm brickwall, plastered on both sides.





c. 1 layer pf 15mm/9mm gypsum board on steel studs, 150mm airgapwith 50mm 32kg/m3 fibreglass in the cavity and 110mm brickwall,plastered on both sides.

1.6.3 Stud Details

All stud walls must be full height (slab to slab) wherever there is a soffit. Ifno soffit exists or it is unpractical to build ‘slab to slab’ due to very high soffit,a “box-up” using 2 x 15mm gypsum board is recommended over the top ofthe partition wall.

1.6.4 Wall Penetrations

Any penetrations through any or the acoustic rated walls must be treatedprevent flanking.

1.6.5 Ceilings

a) Fiberglass or equivalent with a minimum absorption performance ofNRC 0.9.

b) Mineral fibre tile or equivalent with a minimum absorptionperformance of NRC 0.9.

c) Fiberglass ceiling as (a) with :-* 2 layers of 12.5mm gypsum board supported off the slab orroof truss.

* 50mm thick 32kg/mm3 fiberglass lay on top of the gypsumboards.

* Minimum 50mm air gap to slab or roof above.

No penetration through the ceiling is permitted without prior approval. Anypenetration should be acoustically sealed tight.

1.6.6 Rain Noise Control

To prevent high levels of rain noise, it is important that some treatment isprovided for the roof system. This system should achieve a noise level of5dB above the design ambient level in the rooms, calculated based on arainfall rate of 100mm/hour or 200mm/hour.

Typical detail constructions are as follows:-

a) 50mm thick low density fiberglass sisalation directly below the tiles.





b) 1 layer of 12.5mm gypsum board supported off the roof truss,150mm minimum air gap and recommended ceilings.

c) 2 layers of 12.5mm gypsum board supported off the roof truss,150mm air gap and recommended ceilings.

1.6.7 Windows

Typically windows shall be as follows:-

a) Double glazing with glass thickness of 14mm and 10mm separatedby a minimum 200mm air gap. There must be no direct structuralconnection between the glass panes. Each layer of glass shouldindependently rest on separate reveals and wall supports.

b) Single layer 15mm laminated glass. Composition of glass layersmust be of different thickness, i.e. 7mm/lamination layer/5mm etc.

1.6.8 Floora) General

A floating floor system shall be used to increase the impact soundisolation and/or the sound reduction index of the structure.

The floor system shall include isolation mounts, perimeter isolationmaterial, penetration isolation, formwork stiffness, temporary

waterproofing, adhesive and caulking.

1. Floating Floor Types

There are two types of commercially available floating floorsystems:-

a) ‘Formwork’ floating floor system b) ‘Jack-up’ floating floor system.

For the ‘formwork’ floor system, vibration isolation pads arefixed to plywood to form sound isolation panels. The soundisolation panels are laid on the floor covered with polythene

membrane and the concrete floating floor slab poureddirectly onto the sound isolation panels which are used asformwork.

For the ‘jack-up’ floating floor system, vibration isolationmounts contained in specially designed housings are locatedon the floor at the correct spacing. The base floor slab isthen poured. When the slab has cured, the floor is raisedusing the threaded jacking elements incorporated into themount housing.





2. Design

The floating floor shall be designed and fabricated by arecognized manufacturer. Other systems would beacceptable if appropriate documentation is available.

The floating floor system shall be designed to ensure thatthe resonant frequency of the total installed system (mounts,floated structure and base) does not exceed 20 Hz, and thatit can withstand any differential loading caused by erectingperimeter structures on the floating slab, and or point loadingfrom machinery. Penetrations or up stands through the floorare to be avoided.

The manufacturer shall provided drawings showing thelocation and type of mounts for each floating floor slab. Forthe ‘formwork’ system, panel layout for the formwork shallalso be shown.

b. Material

1. Isolators

The isolators shall be designed to have a minimumstatic load deflection of 4mm.

2. Formwork System

Isolator’s panels shall consist of 10mmmarine/exterior grade plywood, factory bonded toand supported by either.

a) Pre-compressed moulded glass fiber noiseisolation pads individually coated with flexiblemoisture-impervous elastomeric membraneor

b. Solid rubber isolation pads having AASHO

Table B Bridge Bearing properties.

The isolation pads shall be located at centers of notgreater than 600mm for unloaded areas of the floor,and at centers of 300mm where the floor supportswalls or equipment loads.

50mm thick fiberglass or rock wool absorptionmaterial (24 – 48kg.m3) shall cover a minimum of95% of the area between the isolation pads. The





fiberglass sound absorption material shall beattached to the plywood isolation panels by anapproved method that is resistant to humidity anddryness and is permanent. The joints between allisolation panels shall be strengthened with steelplates. The steel plates shall be at least 1.6mmthick, 100mm square and shall be located at1200mm centers.

3. Jack-up System

The isolators shall be enclosed in a rigid housingincorporating devices which will enable reinforcingbars to be attached to the isolator assembly. Eachassembly shall be furnished with a jack-up screwminimum 19mm diameter to allow fitting of thefloating slab to operating level. The isolator elementshall be either.

a) minimum 50mm thick neopreneor

b) Steel spring with minimum 6mm thickneoprene noise stop pad.

A temporary plug shall be provided to preventconcrete from entering the threaded hole. Isolationpads shall be designed to withstand minimum

overload capacity of 100% for all design loads.

Isolators shall be spaced at no greater than 120mmcenters. Solid rubber pads should be neoprenehaving AASHO Table B Bridge Bearing properties.

4. Perimeter Isolation Board.

a. Perimeter isolation board for the “formwork”system shall be closed cell sponge neoprenebetween 12mm and 20mm thick.

b. Perimeter isolation board for the “jack-up”floating floor shall be closed cell spongeneoprene at least 10mm thick.

c. Isolation board shall be factory cut and shallbe adhered with approved bonding materialto walls, columns, etc. prior to installingisolation panels. Perimeter isolation boardshall be used to isolate floor penetrations to





prevent contact between the floor andpenetrations.

d. The supplier, prior to having materialinstalled, shall verify the building dimensions,the conditions of the area in which theisolation material is to be installed, etc.

c. Installation

1. The floating floor system shall be designed andfabricated at the facilities of an approvedmanufactur er. For ‘formwork’ systems, soundisolation panels must be prefabricated. For “jack-up”systems, this applies to the mounts themselves.Both systems shall be installed by manufacturer orunder their direct supervision.

The floating floor supplier shall be responsible for

Installation of bond breaking material

Layout of isolators

Installation of perimeter isolation board

Supervision of the construction of thereinforced concrete slab.

Raising the poured slab for the jack-upfloating floor system.

Caulking the perimeter for the floating floor.

2. The main contractor shall be responsible for placingreinforcing bars and pouring the concrete under thesupervision of the floating floor supplier. Any cracksappearing at the construction joints should not bemore than hairline cracks. Should any cracks appearto be excessive, it should be packed with caulkingcompound. The main contractor should note that theslab thickness shall not be less than 100mm.

3. The installation of all sound isolation materials shall

be in accordance with the procedures submitted byisolation materials manufacturer’s instructions.

4. All surfaces to be overlaid with a floating floor slabshall be removed of all dirt, debris, loose gravel, etc.in accordance with the manufacturer’s instructions.

5. The floating floor supplier should comment if thefinished of the existing structural slab is unsuitablefor accepting the floating floor system. The main





contractor should ensure that this surface is smoothand level (within normal concreting tolerance) beforeinstallation of the floating floor is to begin.

6. Prior to placement of isolator assemblies, a bondbreaker such as polyethylene sheeting shall beplaced over the entire floor.

7. All isolator shall be placed on the bond breaker inaccordance with the approved shop drawings.

8. Reinforcing bars shall be fixed to the isolatorassemblies in accordance with instructions from thestructural engineer.

9. After installation of the isolation material, theconcrete should be poured monolithically and beallowed to cure.

10. For “jack-up” systems, the floor shall be raised to theoperating elevation after the concrete is cured, inaccordance with the instruction from the floating floorsystem manufacturer. After raising, the screw holeshall be grouted and the perimeter isolation boardscaulked with a permanently flexible sealant.

11. The surface of the floating floor shall be leveled andtrowelled smooth unless surface water runoff isspecifically required by the mechanical engineer. Inany case, the minimum thickness of the floated slabshall be 100mm.

12. All floating floor materials and building componentssupported by the floating floor are to be completelyfree from rigid contact with any part of the buildingstructure.

d. Acoustical Performance

1. Airborne Sound Insulation: The floating floor wheninstalled in the building shall have a field measuredsound transmission loss performance of not lessthan RW 70. The field transmission lost shall bemeasured by an acoustic consultant or testingorganization in accordance to ISO 140/4.

2. Impact Sound Insulation: The impact soundinsulation performance measured in the field shall be





not less than Lp 40. The impact sound insulationshall be measured by an acoustic consultant ortesting organization in accordance to ISO 140/7.

3. The cost of such testing, and any modificationrequired to meet the specified performance, shall beborne by the supplier.

e. Reports.

At the time tender submission, documentation shall befurnished giving dimensional layout drawings of the area tobe covered by the floating floor, an explanation of how thefloor has been designed to accommodate point loading, andtypical details for wall junctions and penetrations. Testsreports showing the sound transmission loss and impactisolation performance of previous installation measured inthe field shall be submitted with tender documentation. Thetests shall have been carried out within the last 5 years inaccordance with the standard specified above or similarapproved national standards.

Prior to installation of the floating floor system, the floatingfloor supplier shall submit a report outlining any deviations tothe specifications which will be required. This report shallinclude:-

1. Complete description of the system.

2. For the “formwork” system, a complete dimensional panellayout for the specified area based on site verifieddimensions of the building including actual location ofwalls, partitions, columns, kerbs, penetrations, etc and acomplete dimensional layout showing the positioning andtype of all mounts.

3. For the ‘jack-up’ system, a complete dimensional layout forall mounts for the specified areas based on site verified

dimensions of the building, including actual location of thewalls, partitions, columns, kerbs, penetrations, etc.

4. Actual loading and deflection of each isolator, includinglive and dead loads imposed by concrete and reinforcing,plant items, pipework, walls, etc.

5. Load versus deflection characteristics of all isolationmounts proposed, including dynamic load characteristicsand ageing properties.





6. Clearly defined proposed installation instructions indicatingsequence of operation, construction sequence of formworkand steps of curing, trades required material storagerequirements, etc.

1.6.9 Doors

Doors shall be as follows:-

a) Proprietary timber door with STC 55/46/35 rated, with/out glazing,single or double leaf.

b) Solid Core Timber Door (Fire Door) shall be core timber door fittedwith an acoustic seal set to the jamb and bottom of the door. Thethickness must be at least 45mm or a surface mass of at least22kg/m2.

a) General

1. All acoustics doors shall provide a high degree of soundinsulation as specified below.

2. All acoustics doors shall have at least one-hour fire rating oras specified by Jabatan Bomba whichever is higher.

3. The supplier of the acoustics doors shall be responsible forreviewing the construction details for areas surrounding thedoor to ensure that flanking transmission does not degradethe acoustical performance of the door.

4. The door system shall incorporate suitable seals at all jointsincluding the head and sill.

5. Malaysian building practice normally requires the door frameto be installed at an early stage in the building construction.This can potentially result in poor fitting doors because ofinaccurate alignment of the frame. The door supplier shall

therefore satisfy the acoustics consultant that the requiredacoustical performance can be achieved with such aninstallation sequence can be achieved with such aninstallation sequence and that the seals and door leaf will notbe damaged during the remainder of the construction work. Alternatively, the supplier shall submit an alternativeinstallation method for approval by the acoustic consultant.

6. The door supplier shall provide the main contractor withwritten instructions and installation details for all doors. All





such instructions shall be copied to the architect andacoustic consultant.

7. Immediately prior to installation of the door system, thesupplier shall notify the acoustical consultant in writing of anypart of the building construction which the supplier believeswill degrade the final performance of the door system.

b. Acoustical Performance

1. Laboratory Testing

1.1 STC Performance

The acoustic door shall achieve a minimum soundtransmission class rating shown below based on laboratorysound transmission loss tests in accordance with ISO 140/3or similar approved national standard.

Acoustic Door Type Class Minimum SoundTransmission Class RatingRw (STC)

High Performance (D1) 55Medium Performance (D2) 45Low Performance (D3) 35

1.2 Octave Band Performance

In addition to clause 1.1, type D1 acoustic doors shallachieve the minimum octave band sound transmission lossshown below. Test data shall be in accordance with ISO140/3 or similar approved national standard.

Acoustic Door Minimum Octave Band SoundType Transmission Loss (dB)

D1 63 125 250 500 1K 2K 4K

20 35 47 52 55 60 55

2 Field Testing

The doors, when installed in the building, shall achieve a fieldmeasured sound transmission loss performance shown below. Thefield transmission loss shall be measured by an approved AcousticalConsultant or testing organization in accordance with ISO 140/4.The costs of such testing, and any modifications required to meet





the specified performance, shall be borne by the supplier.

Acoustic Door Type Minimum Sound Transmission ClassRating Rw (STC)

D1 50D2 40D3 30

2.1 Door frames

The door frames for door types D1, D2 and D3 must not beconnected to both studs of the wall in which they are installed. Theyshould be hung from the outer stud of the room they are servicing,e.g. for a door from studio to a corridor, the door should be hung offthe corridor stud. These doors will be quite heavy and appropriateweight allowances must be made when selecting the frames.

c. Tender Submission

1. Laboratory test certificates showing the acousticalperformance of any offered door systems shall be submittedwith the tender documentation. Tests shall have beencarried out within the last five years in accordance with ISO140/3 or similar approved national standard.

2. A test report showing the sound transmission loss of aprevious installation measured in the field shall be submittedwith the tender documentation. The test shall have beencarried out within the last five years in accordance with ISO140/4 or similar approved national standard.

3. A catalogue giving detailed information on the door systemincluding sealing arrangements and operational data shall besubmitted with the tender.

1.7 Acoustic General Requirement

1.7.1 After the installation works have been complete and tested and before handing over to theGovernment, the Contractor shall submit certificates, certificate by qualified and competentconsultants in the relevant fields, that the installations and equipment have beensatisfactorily completed and tested in accordance with the requirements of the Contract withregards to functions, operations, performances, safety etc.

1.7.2 The Contractor shall guarantee the installations and equipment free from defective/faultydesign, manufacture fabrication, installation works etc. during the Guarantee Period asmentioned in the Contract.





1.7.3 Any problem reported related to the equipment due to deficiency in the design, fabricationetc. shall be reported to the Project Director. The cost of modification and making goodthese deficiencies shall deemed to be included in the Contract.

1.8 GENERAL INSTRUCTION TO CONTRACTOR

1.8.1 The acoustic works to be provided/installed, unless mentioned otherwise, shall be inaccordance with normal JKR practices and the standard JKR specifications. The contractorshall deem to be familiar with the above mentioned specifications, practice, guidelines,recommendations and the site conditions before submitting their proposals. If there is anydiscrepancy in the above document, the matter shall be referred to the Project Directorwhose decision shall be a final.

1.8.2 The Contractor shall submit all the necessary layout drawings, schematic drawings, systemdrawings, wiring diagrams etc. together with their proposal submissions. Contractor shallsubmit full specifications, technical details, catalogues, name of manufacturers, modelnumbers etc. of the equipment and materials together with their proposal documents. Adetail programme of works shall also be submitted. The electrical section of the submissionshall be separate volume.

1.8.3 Wherever a manufacturer’s name and/or model are mentioned in this document, it isintended as a guide to the type of construction, general appearance, performance,characteristics, quality and standard of manufacture of the equipment or materials and shallnot exclude the Contractor from offering alternative equipment or materials of similar or

better type.

1.8.4 Technical drawings submitted together with this document reflects the design concept,technical application and does not constitute construction drawings.

1.9 Equipment, Materials, Workmanship and Schedule of Works

1.9.1 All materials, equipment and accessories shall be suitable for the function and environmentwhere they are to be installed/used.

1.9.2 Materials and equipment installed that are exposed to see breeze shall made of non

corrosive material for longer lasting.

1.9.3 If the project is situated near the sea, special attention shall be taken in the design of theequipment and selection of the materials to be used in order to minimize the effect of thecorrosive environment on the equipment and the materials.

1.9.4 All works shall be of good current engineering practices and shall be carried out andsupervised by qualified, competent and skilled personnel.





1.9.5 Detailed schedules of works indicating the sequence of design, preparation of drawings,fabrication, construction, execution, installation, testing etc. of each type of installations andworks shall be submitted within one month after the award of the Contract. A detailedschedules pf prices for the major equipment and works shall also be submitted togetherwith the schedules of works.

1.9.6 All design, installations and equipment offered shall be useful and beneficial to the user.The design shall be certified by qualified and competent consultants in the relevantfields. They shall be free from any defects, shortcoming or wastefulness in terms of everyaspect which cover installation, operation, maintenance, safety, security, aesthetic etc. aswell as related to cost. Design calculations, study report shall be submitted together withthe submission/proposal.

2.0 Drawings, Technical Details, Operation and Maintenance Manual

2.0.1 Within three months after the award of the Contract, the Contractor shall submit four sets ofdetail design and drawings to the Project Director’s office and one set at the site office.

2.0.2 The drawings shall be accompanied with detail calculations, technical data and catalogues.The Contractor shall also submit shop drawings and construction drawings to the ProjectDirector for comment prior to fabrication and installation. Installation manuals shall besubmitted before installing any equipment.

2.0.3 Within three months after the completion and handing over of the project, the Contractorshall submit two (2) sets of drawing in CD ROM complete with retrieving facility and four (4)

sets of prints of as-built drawings, technical information, catalogues, operation andmaintenance manuals, servicing schedules, testing and setting results etc. to the ProjectDirector for comment and retention. These documents shall be properly bound with hardcovers. If the Project Director shall make the necessary alternations and amendments andresubmit the documents within three weeks after the comment is made.

2.1 Supervision

Supervision of acoustic works shall be done by qualified or competent personnel in theacoustic field full time at site supported by technical staffs. The competent personnel haveminimum 4 years experience working at site.

2.2 Certification of Works, Final Inspection, Testing and Commisioning

2.2.1 After the installation works have been completed, the Contractor shall engage competentProfessional Engineers of the relevant disciplines to carry out inspections, performancetests of the installations and equipment according to the standards and the Contact.

2.2.1 The same Professional Engineers shall certify that the installations and equipment havebeen completed and are functional and safe to be used/operated according to the





requirements of the Contract, the recommendations of the manufacturers. A set of theabove testing results and reports shall be submitted to the Project Director for approvalbefore any commissioning work is to be commenced.

2.2.2 The format of the reports for the final inspection and testing of the installations andequipment shall be submitted to the Project Director for approval. A schedule for finalinspection and testing agreed upon by all the relevant parties shall be submitted to theProject Director at least two weeks in advances before any final inspection and testing is tobe commenced so that the testing and commissioning may be witnessed by the ProjectDirector/Project Director’s representatives.

2.2.3 All testing works shall be carried out in the presence of the Project Director’srepresentatives unless otherwise approved by the Project Director.

2.3 Training

The Contractor shall arrange for proper training courses, both classroom lectures and onsite practices, for Government personnel on the operation and maintenance of theinstallations and equipment at a suitable time before and/or after the testing andacceptance tests. Proper notes, instructions, manuals etc. shall be provided for thetrainees.

2.4 Guarantee and Maintenance

2.4.1 The Contractor shall guarantee the whole installation free from defect and inadequacy in

design, manufacture, fabrication, and installation works during the Guarantee Period afterthe official handing over of the project as specified in the Contract.

2.4.2 The Contractor shall be responsible for maintaining the whole installation during theMaintenance Period as specified in the Contract.

2.4.3 The Contractor shall repair/replace all defective/faulty equipment/works during theGuarantee Period and Maintenance Period. All materials, replacement parts, equipment,labour etc. required for the repair and maintenance of the installations, works, equipmentetc. during the Guarantee Period and Maintenance period shall be provided by theContractor.

2.4.5 The schedule of maintenance program shall be submitted to the Project Director before thecertificate of practical completion being issued. Scheduled and Preventive Maintenanceshall be carried out for overall system during the Maintenance and Guarantee Period.





2.4.6 The Contractor shall take immediate action to carry out any repair work and restore theinstallation to its normal operating conditions upon receipt of the complaint from the officer

in-charge of the university or his representatives. If no action is taken to carry out the repairwork within twenty four hours upon lodging of the report, the Project Director shall reservethe right to engage a third party to carry out the repair works with all the costs and expensescharged to the Contractor. If any equipment or plant requires more than two days to berepaired or replaced, the Contractor shall arrange for a similar equipment or plant to beinstalled and used temporary until such times the equipment or plant has been repaired orreplaced; failing which, the Project Director shall reserve the right to arrange for a similarequipment or plant to be used all expenses charged to the Contractor.





TABLE 1

RECOMMENDED DESIGN SOUND LAVELS FOR DIFFERENT AREAS OF

OCCUPANCY IN BUILDINGS

Type of occupancy/activity Recommended design Recommended

sound level reverberation

time (T)

Satisfactory Maximum s

1 EDUCATIONAL BUILDING

Art/craft studios 40 dB(A) 45 dB(A) -

Assembly halls up to 250 seats 30 dB(A) 35 dB(A) Curve 1*

Assembly halls over 250 seats 25 dB(A) 30 dB(A) 0.6 to 0.8

Audio-visual areas 40 dB(A) 45 dB(A) 0.6 to 0.8

Business study areas 40 dB(A) 50 dB(A) 0.6 to 0.8

Classrooms--

Single cell 35 dB(A) 40 dB(A) 0.6 to 0.7

Secondry "open space" teaching areas 40 dB(A) 45 dB(A) 0.5 to 0.6

Primary "open space" teaching aareas 40 dB(A) 45 dB(A) 0.4 to 0.5

Computer rooms--

Teaching 40 dB(A) 50 dB(A) 0.4 to 0.6

Working 45 dB(A) 55 dB(A) 0.4 to 0.6

Conference rooms 30 dB(A) 35 dB(A) 0.6 to 0.7

Corridors and lobbies 45 dB(A) 50 dB(A) -

Drama studios 30 dB(A) 35 dB(A) see note 4

Duplicating room/stores 45 dB(A) 50 dB(A) -Engineerring workshops 45 dB(A) 55 dB(A) -

Gymnasiums 45 dB(A) 55 dB(A) see note 4

Interview/counseling rooms 40 dB(A) 45 dB(A) -

Laboratories--

Teaching 35 dB(A) 40 dB(A) 0.5 to 0.7

Working 45 dB(A) 50 dB(A) 0.6 to 0.8

Lecture rooms up to 50 seat 30 dB(A) 35 dB(A) curve 1*

Lecture theaters--

Up to 250 seats 30 dB(A) 35 dB(A) Curve 1*

More than 250 seates 25 dB(A) 30 dB(A) Curve 1*

Libraries--

Reading areas 40 dB(A) 45 dB(A) -Stack areas 45 dB(A) 50 dB(A) -

Manual arts workshops 40 dB(A) 45 dB(A) -

Madical rooms (First Aid) 40 dB(A) 45 dB(A) 0.6 to 0.8

Music practice rooms 40 dB(A) 45 dB(A) 0.7 to 0.9

Music studios 30 dB(A) 35 dB(A) Curve 2*

Office areas 40 dB(A) 45 dB(A) 0.4

Professional and administrative office 35 dB(A) 40 dB(A) 0.6 to 0.8

Seminar rooms 30 dB(A) 35 dB(A) 0.6 to 0.7

Staff common rooms 40 dB(A) 45 dB(A) 0.4





Toilet/change/showers 45 dB(A) 55 dB(A) -

Tutorial rooms 30 dB(A) 35 dB(A) 0.6 to 0.7

2 HEALTH BUILDINGS

Audiological test room See AS 1269See AS

1269 -

Casualyty areas 40 dB(A) 45 dB(A) -

Corridors and lobby space 40 dB(A) 50 dB(A) -

Consulating rooms 40 dB(A) 45 dB(A) -

Delivery suites 45 dB(A) 50 dB(A) -

Dental clinics 40 dB(A) 45 dB(A) -

Geriatric rehabilitation 35 dB(A) 45 dB(A) -

Intensive care wards 40 dB(A) 45 dB(A) -

Kitchens,sterilizing and service areas 45 dB(A) 50 dB(A) -

Laboratories 45 dB(A) 50 dB(A) -Office areas 40 dB(A) 45 dB(A) -

Operating theater 30 dB(A) 35 dB(A) -

Pharmacies 45 dB(A) 50 dB(A) -

Sterilizing areas in operating theater 40 dB(A) 45 dB(A) -

Surgeries 40 dB(A) 45 dB(A) -

Ward spaces--

Single bed 30 dB(A) 35 dB(A) -

Two or more beds 35 dB(A) 40 dB(A) -

Waiting rooms,reception areas 40 dB(A) 50 dB(A) -

3 INDUSTRIAL BUILDING

Assembly lines--Light machinery 50 dB(A) 70 dB(A) -

Packaging and delivery 50 dB(A) 60 dB(A) -

Foremen"s offices 45 dB(A) 50 dB(A) -

Industrial processing or manufacturing See Note 1 See Note 1 -

Laboratories or test areas 40 dB(A) 50 dB(A) -

Lunch 40 dB(A) 55 dB(A) -

Precision assemblies 40 dB(A) 50 dB(A) -

Sick bays 40 dB(A) 50 dB(A) -

4 INDOOR SPORTS BUILDINGS

Billiard and snooker rooms 35 dB(A) 45 dB(A) -

All other indoor sports--

With coaching 45 dB(A) 50 dB(A) See Note 5

Without coaching 50 dB(A) 55 dB(A) See Note 5

5 OFFICE BUILDINGS

Board and conference rooms 30 dB(A) 35 dB(A) 0.6 to 0.8

Cafeterias 45 dB(A) 50 dB(A) -

Calculation and tabulationareas 45 dB(A) 55 dB(A) 0.4

Computer rooms 45 dB(A) 55 dB(A) -






Design offices 40 dB(A) 45 dB(A) 0.4

Draughting offices 40 dB(A) 50 dB(A) 0.4

General office areas 40 dB(A) 45 dB(A) 0.4

Private office 35 dB(A) 40 dB(A) 0.6 to 0.8

Public spaces 40 dB(A) 50 dB(A) -

Reception areas 40 dB(A) 45 dB(A) -

Rest rooms 40 dB(A) 45 dB(A) 0.4

Toilets and tea rooms 50 dB(A) 65 dB(A) -

Typing pool areas 45 dB(A) 55 dB(A) -

Undercover carparks 55 dB(A) 65 dB(A) -

6 PUBLIC BUILDING

Airport terminal--

Departure lounges 45 dB(A) 60 dB(A) -Luggage despatch and collection areas 45 dB(A) 60 dB(A) -

Passanger check in areas 45 dB(A) 50 dB(A) -

Art gallaries 40 dB(A) 50 dB(A) -

Auditoriums--

Cabarets and theater restaurants 30 dB(A) 35 dB(A) Curve 3*

Concert and recital hall 20 NR 25 NR Curve 2*

Conference and convention centres--

Without sound reinforcement--

Up to 50 person 30 NR 35 NR Curve 1*

From 50 to 250 25 NR 30 NR Curve 1*

With sound reinforcement--

Up to250 person 35 NR 40 NR Curve 1*More than 250 person 25 NR 35 NR Curve 1*

Drama theater 20 NR 25 NR See Note 4

Exhibition areas 40 dB(A) 50 dB(A) -

Motion picture theater 25 NR 30 NR See Note 4

Opera halls 20 NR 25 NR Curve 4*

Theaters for opretta and musical plays 25 NR 30 NR Curve 4*

Palace of worship--

Up to 250 congregation 30 dB(A) 35 dB(A) Curve 5*

More than 250 congregation 25 dB(A) 30 dB(A) Curve 5*

With speech amplification system 35 dB(A) 40 dB(A) Curve 5*

Municipal buildings--

Administrative offices 35 dB(A) 40 dB(A) 0.6 to 0.8

Genetal offices 40 dB(A) 45 dB(A) 0.4

Public spaces 45 dB(A) 50 dB(A) 0.4

Council chambers 25 dB(A) 30 dB(A) Curve 1*

Courts--

Court rooms 25 dB(A) 30 dB(A) Curve 1*

Court reporting and transcript areas 35 dB(A) 40 dB(A) 0.6 to 0.8

Judge" chamber 30 dB(A) 35 dB(A) 0.4 to 0.6

Legal and interview rooms 40 dB(A) 45 dB(A) 0.6 to 0.8





Waiting areas 40 dB(A) 50 dB(A) -

Libraries--

Administrative offices spaces 35 dB(A) 40 dB(A) -

Reading areas 40 dB(A) 45 dB(A) -

Stack areas 45 dB(A) 50 dB(A) -

workshop areas 45 dB(A) 55 dB(A) -

Museums (exhibition spaces) 40 dB(A) 45 dB(A) -

Parking stations (carpark areas) 55 dB(A) 65 dB(A) -

Post offices and general banking areas 45 dB(A) 50 dB(A) -


Railways and bus terminal--

Ticket sales areas 45 dB(A) 55 dB(A) -

Waiting areas 45 dB(A) 60 dB(A) -

Restaurants and cafeterias--

Cafeterias 45 dB(A) 55 dB(A) -Coffee bars 40 dB(A) 50 dB(A) -

Restaurants 40 dB(A) 45 dB(A) -

7 RESIDENTIAL BUILDINGS

Private houses (rural and outer suburbs)--

Recreation areas 30 dB(A) 40 dB(A) -

Sleeping areas 25 dB(A) 30 dB(A) -

Work areas 35 dB(A) 40 dB(A) -

Private houses (inner suburbs)--

Recreation areas 35 dB(A) 40 dB(A) -


Work areas 35 dB(A) 40 dB(A) -Hotel and motels--

Bar and lounges 45 dB(A) 55 dB(A) -

Conference areas 30 dB(A) 35 dB(A) Curve 1*

Dinind rooms 40 dB(A) 45 dB(A) -

Enclosed carparks 55 dB(A) 65 dB(A) -

Foyer and recration areas 45 dB(A) 50 dB(A) -

Kitchen,laundries and maintenance areas 45 dB(A) 55 dB(A) -


Washrooms and toilets 40 dB(A) 55 dB(A) -

Hotel ,residential hall and barracks--

Cafeterias 40 dB(A) 55 dB(A) -

Common rooms 35 dB(A) 40 dB(A) -

Games rooms 40 dB(A) 50 dB(A) -

Kitchens and service areas 45 dB(A) 55 dB(A) -


8 SHOP BUILDINGS

Department stores--

Main floor 50 dB(A) 55 dB(A) -

Upper floor 45 dB(A) 50 dB(A) -





Enclosed carparks 55 dB(A) 65 dB(A) -

Show rooms 45 dB(A) 50 dB(A) -

Small retail stores (general) 45 dB(A) 50 dB(A) -

Speciality shops (where detailed discussion is

necessary in transactions) 40 dB(A) 45 dB(A) -

Supermakets 50 dB(A) 55 dB(A) -

9 STUDIO BUILDINGS (see note 2 and 3)

Drama studios 15 NR 25 NR See Note 4

Flim or televasion studios 20 NR 25 NR Curve 6*

Music recording studios 15 NR 20 NR Curve 2*

Saund stages 15 NR 20 NR -

Talks studios 20 NR 25 NR Curve 7*

* See Appendix A

NOTES:

1 A very wide range of noise levels can occur in the occur in the occupied state in spaces housing

manufacturing processes, being limited only by statutory regulations aimed at hearing

conservation. The possibilities for segregating very noise processes from quieter ones, by

partitioning very between particular industries and plants. For reason such as these, it difficult to

make generalized recommendations for desirable,or even maximum,design levels for the

unoccupied state, but one guiding principle may still be observed-when the activity in one area of

a manufacturing plant is desirable that the local lavel should if possible drop to 70dB(A) or lower,

to permit speech communication without undeu effort.

2 In spaces in which high quality sound recordings are to be made, the levels set for the low

frequency octave bands should not be exceeded. Subsequent replay of recordings may cause an

amplifications of the ambient sound resulting in an overemphasis of its low-frequency

components. Recommended levels are given in Appendix C. Specialist advice should always be

sought when these spaces are being designed. In some circumstances, for purposes of very high

quality recording, even lower than those specified in Table 1 may be required.

3Recommended reverberation times is 10 percent to 20 percent higher than Curve 1 of Appendix

A.

4 Reverberation times should be not more than twice that for speech auditoria (see Curve 5) of

comparable volume if speech communations is important

5 The specifying authority concerned with mechanical services in buildings may use design and

acceptance sound levels in terms of noise rating numbers.Where NR values are not in the table,

an NR value which is numerically 5 less than the recommended sound level in decibels(A) maybe

used. In this case, caution should be used as there is not a universal relationship between

decibels(A) and noise rating numbers which would enable the noise rating to be derived from a

measured noise level in decibels(A) and vice versa.

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