APT Sound Testing - Telephone 01525 303905
APT Sound Testing

Sound Testing Services


APT Sound Testing provide UKAS accredited sound insulation testing throughout the UK as required by Approved Document E of the Building Regulations. We undertake sound testing on all types of residential buildings and commercial buildings. We also undertake sound testing on schools and buildings containing rooms for residential purposes.

Our team of experienced sound test engineers are dedicated to giving our customers the best quality of service and offer acoustic design advice where possible, to help our clients achieve the required acoustic results to pass the sound testing and attain building completion. We can also undertake ‘in house’ UKAS accredited air tightness testing and sound testing in one seamless package, lowering costs and negating coordination issues.

We pride ourselves on offering:

• Fully Accredited – we are one of the few companies that is UKAS accredited for both air and sound testing, so you can rest assured our reports will be accepted by building control.
• Fast response - we can usually get to your project within one working week, sometimes faster if it’s an emergency.
• Acoustic remedial advice - if your development fails any of the tests we can offer a remedial acoustic solution to help you achieve compliance.
• Quick results - sound testing is arranged around your build schedule and you will receive an immediate indication of test performance on site.
• Electronic reportage – all or reports are sent electronically so you can send it straight to building control for immediate sign off - no snail mail with us.
• One stop solution for Parts E & L - A complete compliance UKAS accredited solution for both sound and air tightness testing to lower costs and negate coordination issues

What is Sound Testing & How to Pass
We often get asked the same questions in regards to sound testing. Over the last couple of years we have collated and answered these questions which are shown below. Sound Testing is completed near the end of a development to show that the performance of the party wall and floor partitions meet the standards as stipulated in Building Regulations Approved Document E. The testing methods for airborne and impact sound insulation is in full accordance with the suggested methods presented in BS EN ISO 140-parts 4 & 7: 1998.

Our clients often asked what types of sound testing and noise surveys we undertake. Here is a quick summary of our acoustic services:

We are UKAS accredited to carry out Sound Insulation testing for:

» Houses and flats in compliance with Part E of the Building Regulations.
» Houses & Flats in compliance with the Code for Sustainable Homes.
» Classrooms within schools in compliance with BB93.
» All commercial buildings in compliance with BREEAM.

We also carry out carryout noise surveys to comply with the following:

» Noise Surveys BS8233 for Planning Applications.
» Background Noise Surveys for Air Conditioning Plant BS4142
» Industrial Noise Surveys

Apartment blocks often require airborne wall, floor and impact sound tests. Airborne sound tests are normally required between horizontally and vertically separated pairs of rooms. The sound tests are undertaken by using a sound source, amplifier and loudspeaker to generate a high noise level in one room (the source room). Noise measurements are then taken in both the source and receiver rooms using a prescribed number of source and microphone positions. The background levels in the receiver room are measured and the reverberation time in the receiver room is also measured. From the results, the airborne sound insulation (DnT,w + Ctr) is calculated and compared to the requirements of Approved Document E.

For or vertically separated rooms impact sound testing may also be required. This sound test is undertaken using a » tapping machine» , which drops a series of weights/small hammers onto the floor of the upper room. The noise level in the lower (receiver) room is measured for a prescribed number of source and microphone locations. The background levels in the receiver room are measured and the reverberation time in the receiver room is also measured. From the results, the impact sound insulation (L'nT,w) is calculated and compared to the requirements of Approved Document E.

The sound levels required are usually 45dB for airborne wall and floors and 62dB for Impact sound testing. for converted properties the sound levels change to 43dB for airborne wall and floors and 64dB for Impact. the amount of sound tests you require depends on the size of the development. All new build properties and conversions require 10% of each party wall/floor construction type to be tested, i.e. if you have 10 flats you would require 1 x 6 pack, this consists of 2 airborne wall, 2 airborne floor & 2 Impact sound tests. However if you have 11 units this would rise to 12 Sound Tests or 2 x 6 pack. If you are complying with code for sustainable homes the standard required may rise between 3-8dB so if you need to comply with more stringent standard, than it's worth asking us to undertake an acoustic design review. For a small fee you have a peace of mind that the acoustic elements will be robust enough to pass the sound insulation test.

There are two types of sound testing, they are:

Airborne Sound Tests
Airborne sound tests may be required between horizontally and vertically separated pairs of rooms. The sound tests are undertaken by using a sound source, amplifier and loudspeaker to generate a high noise level in one room (the source room). Noise measurements are then taken in both the source and receiver rooms using a prescribed number of source and microphone positions.

The background levels in the receiver room are measured and the reverberation time in the receiver room is also measured. From the results, the airborne sound insulation (DnT,w + Ctr) is calculated and compared to the requirements of Approved Document E.

Impact Sound Tests
For vertically separated rooms, an Impact sound test may also be required. This sound test is undertaken using a » tapping machine» , (as above) which drops a series of weights onto the floor of the upper room. The noise level in the lower (receiver) room is measured for a prescribed number of source and microphone locations. The background levels in the receiver room are measured and the reverberation time in the receiver room is also measured. From the results, the impact sound insulation (L'nT,w) is calculated and compared to the requirements of Approved Document E.

Our Acoustic Design Pathway to Sound Testing Success

Site Visits & Sample Sound Testing
We offer a professional proactive approach to acoustic design, onsite construction checks and pre-completion sound testing. Using our on-going, proactive approach we ensure clients receive professional advice every step of the way, with an on-going continual consideration of cost. The importance of undertaking design reviews and on site construction checks is often forgotten resulting in sound test failures at the end of the project prior to building control signoff. This can be extremely costly in terms of programme and possible claims by the client. By undertaking careful acoustic design from the initial design stage through to completion it greatly reduces the risk of sound testing failure.

Acoustic Surveys
We offer Acoustic Site Survey Visits to let us view the existing site construction. This allows us to check for potential problematic areas such as lightweight blocks haven't been used in the existing construction. It also lets us check that the installation teams are installing the acoustic materials as per manufacturer's guidelines, thus avoiding crucial onsite mistakes. In our experience a sound test failure is often due to the poor workmanship rather than the actual design. The site survey visits negate the risk of sound test failure.

We also undertake sample sound testing of the existing construction. This offers an accurate overview of the acoustic performance of the existing partitions which enables us to offer an acoustic design which correlates with the existing construction.

Defect Diagnosis & Remedial Advice
With over 30 years' experience in building acoustics, we are able to diagnose the reasons for the sound test failure and recommend a cost-effective solution. Often, the reasons for the partition failure are obvious to the test engineer in which case the advice will be minimal and subsequently the cost for acoustic design advice will be minimal. Sometimes, there are more technical issues which require more detailed diagnosis and invasive investigation, such as large amounts of noise flanking due to serious design faults, e.g. the use of lightweight blocks in the construction of an apartment development.

Acoustic Design Knowledge
We have considerable experience in all matters related to architectural acoustic design and detailing. We can help develop the initial acoustic design of the project from the initial design scheme stage. Our approach is robust and does not leave any room for errors using our In-depth knowledge of acoustic materials, construction systems and Regulations we can provide the following:

» Provision of cost-effective and practical acoustic solutions
» Thorough understanding of the desired character of the space
» It is essential that strong communication among the members of the design team members is essential, to facilitate this we can undertake design meetings and site inspections to finalise the acoustic solutions in full accordance with the project's aims.
» Specification of External Building Fabric and including walls, doors and windows in order to minimise noise break-in, or break-out for privacy and overall acoustic quality within dwellings.
» Acoustic testing of existing wall façades to ISO 140-5, to check the existing sound levels so new targeted wall upgrades can be specified.
» Acoustic Investigation and design of rooms/spaces for a wide range of environments such as schools, offices and commercial spaces.

Improving Sound Insulation Results on Existing Dwellings
Many of the dwellings in London consist of flats converted from large Victorian houses.. Unfortunately at the time of the building conversion, designing for sound insulation was not a high priority and so many of the dwellings suffer from adverse noise transference between the floor and wall partitions. This can be extremely stressful to the occupant's wellbeing is a major cause for concern.
There are ways to improve the airborne and impact performance by improving the wall/floor partitions ability to reduce the amount of sound transmission from one side of a construction element to the other. By isolating the different materials may not be enough its own and you may need to improve the mass of the partition as well.

Improving Existing Floor Partitions
In our experience of undertaking hundreds of sound tests on refurbishment projects usually achieve 30-35dB for airborne sound and 70dB for Impact Sound, if the existing construction has not been acoustically upgraded. These figures do not meet the required 43dB & 64dB as stipulated in Part E of Building Regulations. As sound double every 10dB this is a massive failure and acoustic improvements must be made. Many existing construction consist of a similar construction as shown in as detail 1 below.

Detail 1: Existing Floor Partitions Rated At Approx. 30dB

existing floor partitions


Acoustic Improvements to Existing Floor Partitions
To reduce airborne and impact sound transmission this usually means adding density and isolation to the floor construction. This can be as simple as adding a drop ceiling consisting of 125mm timber frame. The top of the frame must be a minimum of 25mm below the existing ceiling finish - such as lathe and plaster. Then, to the inside of the timber frame add 100mm of Acoustic Wool and two layers of sound-board tacked to the bottom of the timber frame - all boards to be lapped. This should improve your sound test results by approx. 10-15dB depending on the existing site conditions and quality of the installation. Detail 2 shows this in more detail.

Detail 2: Acoustic Flooring Partition Upgrade

acoustic flooring


Improving Existing Wall Partitions
The standard onsite construction for existing internal walls may be a mixture of 100mm masonry with render applied to either side; or, 100mm timber partition with lathe and plaster to either side. Unfortunately neither of these existing wall constructions will have the acoustic properties to pass Part E in their existing state due to lack of mass and poor isolation values.

One way to quick and simple way improve the acoustic performance of a the dividing wall partition, is to install a 70mm metsec partition in front of the existing wall - its usually best to install this in the largest room. Leave approx. 25mm gap between the back of the metsec and the wall. Then install 50mm acoustic wool to the inside of the metsec and add two layers of soundboard to the outside of the metsec frame, ensuring all boards are properly lapped and the perimeter joints are filled with acoustic mastic.

Taking the above into account is it essential that the acoustic design is addressed right from the start of the refurbishment project, so it prevents delays in handover, i.e. to prevent the dwelling failing the sound testing at building control signoff stage.- a common problem.

We can also offer acoustic design advice and UKAS sound testing on existing flats to ensure that the building handover is not delayed due to noncompliance with Part E. We can also undertake sample sound testing on projects where clients are worried about existing 'hybrid' construction/s to help highlight the existing noise levels so acoustic upgrades - if required) can be quickly targeted and implemented.

SOUND TESTING - QUESTIONS AND ANSWERS
Please find our list of common questions and answers, to help you prepare for the sound testing:

Q. How do I know if my project is ready for a sound insulation test?
A. All plots should be at least at second fix stage - for further details please refer to our sound testing checklist

Q. Will the sound testing disrupt other site works?
A. During the sound testing, high levels of noise are generated but in order to make accurate test measurements, relatively quiet conditions are needed. Anyone working in the testing area will have to leave temporarily and any noisy works in the vicinity of the test rooms will need to be halted. The time taken for sound testing varies with the site conditions, but generally a set of tests on houses and flats takes about one to two hours so it's over fairly quickly.

Q. Do I need to inform my neighbours of the sound testing?
A. If the building under test is attached in any way to occupied properties then you will need to inform the neighbours. To comply with Part E we need to gain access to the neighbouring properties to undertake the sound test. You will need to ensure that access is provided to the neighbouring properties throughout the sound testing.

Q. Will all internal and external doors and windows need to be fully installed?
A. Yes, all internal and external doors must be fitted and operable prior to the sound testing

Q. What if I only have 110 volt on site?
A. Unfortunately we cannot undertake the testing; we will need 240V to undertake the sound testing.

Q. Can you offer advice on how to pass the sound testing?
A. Yes, we can offer an acoustic design advice service. If you send through the relevant drawings such as sections, plans etc. during the earlier stages of construction, we can look at your design to check if the design is robust enough to pass Part E and/or there are any junctions or details where 'noise flanking' may occur. You can then change your design to reduce the chance of a sound test failure.

Q. Do you have a check-list we can download to help us prepare for the sound test.
A. Yes we do, please click on our sound test checklist; this should help you prepare for the testing.

 

 

sound testing data



What Levels Do I Need To Achieve To Pass Part E?
The Building Regulations Part E require that builders demonstrate the sound insulation performance of separating walls/floors in new-build dwellings and/or converted dwellings or rooms for residential purposes (as well as those newly formed by a material change of use).

This applies when separate dwellings are attached via a common partition not exclusively used by the same occupants. The only way to satisfy the relevant compliance with building regulations is to undertake sound insulations testing.

The regulations set minimum performance requirements for sound insulation between spaces, as to provide reasonable conditions for living. Performance can be demonstrated either by sound testing a sample of as-built constructions/properties.



Basically, for new build properties you need to achieve 45dB or higher for airborne wall and floor sound tests and 62dB for Impact sound tests. For Converted properties the levels are slightly easier to achieve with 43dB for airborne wall and floor sound testing and 64dB for impact sound testing. Brief descriptions of the different types of sound testing are:

Airborne Sound Tests
Airborne sound tests may be required between horizontally and vertically separated pairs of rooms. The sound tests are undertaken by using a sound source, amplifier and loudspeaker to generate a high noise level in one room (the source room). Noise measurements are then taken in both the source and receiver rooms using a prescribed number of source and microphone positions.

The background levels in the receiver room are measured and the reverberation time in the receiver room is also measured. From the results, the airborne sound insulation (DnT,w + Ctr) is calculated and compared to the requirements of Approved Document E.

Impact Sound Tests
For vertically separated rooms, an Impact sound test may also be required. This sound test is undertaken using a » tapping machine» , (as above) which drops a series of weights onto the floor of the upper room. The noise level in the lower (receiver) room is measured for a prescribed number of source and microphone locations. The background levels in the receiver room are measured and the reverberation time in the receiver room is also measured. From the results, the impact sound insulation (L'nT,w) is calculated and compared to the requirements of Approved Document E.

Sound Testing and Noise Flanking Paths

One of the most common reasons for partitions failing the sound testing is down to noise flanking.
Noise Flanking is a term used by acoustic engineers wherein the sound passes over the top or under the primary partition separating the two spaces under test. Flanking sound transmission can be especially bothersome in multi-family residential buildings do to the sheer number of dividing partitions.

One way to reduce the chance of flanking transmission/s is at the design phase of the dwelling. Unfortunately, by simply specifying high performance wall and floor partitions between dwellings is no guarantee to a sound isolation and subsequently a successful sound test. APT Sound Testing offer both preconstruction and post construction design solutions to achieve the required sound isolation requirements of Part E of Building Regulations. We also offer an acoustic onsite inspection service to ensure that the sound insulation elements are being installed as per manufactures guild lines and the quality of the workmanship is consistent with 'best practice' noise control procedures.

You can also undertake you own checks by asking the design consultant i.e. the architect or the builder what steps have been taken to insure your building will be sound adequately sound proofed from your neighbours and from noise intrusion through perimeter envelope from outside the building, after all there isn't any point your dwelling having high spec acoustic insulation between the inner partitions if sound is transferring through the outer envelope.

 

wall sound test


It is never safe to assume because the architect has specified high performance walls, windows and floor/ceiling assemblies that the materials and onsite workmanship will result in compliance with the anticipated results and ultimately a successful sound test. In all these instances successful sound isolation in your home depends on the workmanship during the sound insulation installation phase, the problem is the site installer may know little about noise control techniques unless he is give the right supervision and direction the construction phase.

Part E of Building Regulations stipulates the minimum standards for noise control between residential dwelling units. Upon completion of the building the Building inspection department will need the sound test certification prior to the issue a certificate of occupancy. This shows that the building meets minimum building code standards including sound isolation.

Typical Flanking Sound Transmission Pathways:

» Dividing Floors - Through Floor and Floor Joist Space (if insulation has not been installed or direct fixing to joists without a drop ceiling below the partition under test)
» Dividing Ceilings - Above and Through the Ceiling Space (where an adequate acoustic break has not been carried on through the ceiling void) » Through Structural Steel (structural steel beams are often a major cause of noise transmission as plasterboard is often fixed directly to the steel without sound breaks)
» Shared Structural Building Components - Floor Boards, Floor Joists, Continuous Drywall Partitions, Continuous Concrete Floors, and Cement Block Walls.
» Through Windows (if they are no double glazed or have secondary glazing as a minimum)
» Fixtures & Outlets - Light Switches, Telephone Outlets, and Recessed Lighting Fixtures (if penetrations have been cut back to back with the opposite dwelling under test)
» Structural Joints - Perimeter Joints at Wall & Floor, Through Wall & Ceiling Junctures (these should be filled with acoustic mastic) » Plumbing Chases - Junctures Between the Walls & Floor Slab Above or at the Exterior Wall Juncture (this should be filed with mortar etc. to add mass to this weakened area)
» Around the End of the Partition Through the Adjacent Wall (acoustic mastic should be used to seal this junction)

Even if you your wall/floor has been designed so it should provide a high acoustic rating exceeding Part E requirements, this may not be enough. Unfortunately, sound will always find the weakest link, for instance construction workers will usually jack the plasterboard tight to the ceiling in order to achieve a nice tight joint at the ceiling. This often leaves a void or potential noise transference point at the floor/wall junction, which will eventually be covered with a piece of thin skirting board. Failure to fill the joint between the wall and the floor with acoustic mastic can reduce even a 50dB rated wall to under 40dB which will fail the minimum standard of 45dB as stipulated within the Building Regulations Part E. Often the sound insulation manufacture will provide test lab results for their material. However, you should usually reduce the acoustic target by 4-5dB due to onsite construction. When the construction assembly is tested in the lab it is also certified and the installation techniques are described in detail. Unfortunately it is not always possible to replicate the exact conditions on the site compared to the ideal conditions within in a lab setting, which is a far more controlled and scrutinised environment. This is the reason why a 5 point difference is allowed between the construction design on paper and the actual on site performance.

APT Sound Testing can advise on all types of acoustic design, whether it's accomplished during initial construction or during a refurbishment/renovation project. We have the technical experience to help identify and rectify your soundproofing or noise control problem.

Good Tips to Pass Your Sound Testing
In our experience to improve your chance of passing your sound testing at the first attempt it is important not only that you use the right products, but also you install them correctly.

We have collated a list to show the major construction problems that can increase the chance of sound test failures.

1. Ensure that the sub-floor is watertight and sealed with mastic or silicon.
2. If installing floating screed ensure all isolation layer joints are overlapped and taped.
3. Ensure that the Acoustic floor is fitted with staggered joints.
4. Ensure all the Acoustic floor is sealed watertight even around heating pipes.
5. Do not nail or screw through an Acoustic Floor.
6. Do not screw plaster board into joists, when using Resilient Bars.
7. Ensure the insulation fills the whole width of void, also pack around pipe work.
8. Ensure that the plasterboard on any walls is complete right down to sub-floor, seal all gaps.
9. Ensure you use the isolation tape around the wall of each room.
10. Ensure plasterboard is fitted with staggered layers and all joints sealed.
11. If using Resilient Bars ensure that they are fitted as per manufacturer's recommendations.
12. Ensure all Fireplaces are blocked up with brick or plasterboard.
13. Ensure that any RSJ's or supporting steel work is insulated and isolated from plasterboard.
14. Ensure all waste pipe service runs are boxed in with insulation and plasterboard.
15. Do not fit carpets or laminated flooring before you have passed the test.
16. You must fit doors and windows before the test is carried out, to stop noise transference.
17. Please ensure 240v power is available on each floor, we cannot use 110V.
18. Please ensure we have access to all areas under test, i.e. for flats the plots to the sides, above and below. For houses the plots either side.
19. No building work can take place during tests as it excess background noise levels can have adverse effect on the results.

Designing your Building to Pass Part E Sound Testing
We often get asked what architectural features or plan arrangements can reduce the level of sound insulation or introduce additional sources that may cause us to fail our sound testing. Here is a quick list of the most common problems:

» Internal stairs directly beside a separating wall - this can lead to footsteps being heard inside the adjacent dwelling, especially in bedrooms.
» Using lightweight blocks on flats - lightweight blocks are often used in the construction of internal walls despite the block manufacturer's warnings that they should not be used for the inner envelope or dividing wall construction. The walls are so lightweight they vibrate (almost like a snare drum) so sound can travel up or across the partition.
» Chimney stacks, flues and fireplaces built within a separating wall - this can lead to sound traveling up the flue and being heard in flats above and/or below.
» Recessed cupboards (presses) within a separating wall - this usually means that the width of the sound insulation is compromised which directly leads to a reduction in sound insulation levels.
» A flat spanning over several flats below, for instance a penthouse;
» Communal stairs beside a separating wall - as this is a heavy trafficked area it can lead to footsteps being heard inside the adjacent dwelling, especially in bedrooms.
» Communal vertical soil vent pipes and horizontal service pipes within a separating floor - if the services are not properly boxed out this can lead to general noise going straight through the floor as well as the noise of flushing water as it runs down the SVP pipes etc. » Lifts beside separating walls - this is often a bad scenario due to the higher start up current that's needed to start a lift, this can cause a loud whine when the lift first starts and if there is insufficient sound insulation within the lift wall this will usually be heard by the adjacent resident/s
» Water pumps used to raise water pressure - this can be problematic especially where a bedroom is located on the opposite side of the partition.
» Chimney stacks, flues and fireplaces built within a separating wall - this is often a major cause of noise problems as they are often built quite close to each other thus reducing the mass of the separating wall/partition.
» Recessed cupboards (presses) within a separating wall - again this reduces the sound insulation levels as it reduces the mass of the wall partition.

It is worth noting that with careful consideration during the design phase most potential sound transference problems can be negated.

It is worth noting that general exposure to noise from adjacent dwellings may act as a catalyst affecting the occupant's health and well-being. Noise that is unavoidable, unimportant or emotive is often the most annoying. Disrupted sleep and listening to television/radio are the most common noise-disrupted activities. Noise transmission between dwellings causes increased tension between neighbours and leads to disputes, which may result in physical assaults.

Sound Testing - Broken Down Rating Methods

The sound insulation rating methods that follow are defined in:

Sound insulation testing is usually undertaken near the end of a project to show that the party wall and floor partitions meet the standards shown in Building Regulations Approved Document E. The method for sound testing for airborne and impact sound insulation is in full accordance with: the suggested methods presented in BS EN ISO 140-parts 4 & 7: 1998. Sound tests are broken down into various rating methods.

The sound insulation rating methods that follow are defined in:

Rating Method - RW
This single figure rating method is the rating used for laboratory airborne sound insulation tests. The figure indicates the amount of sound energy being stopped by a separating building element when tested in isolation in the absence of any flanking paths.

Rating Method - DnTw
The single figure rating method that gives the airborne sound insulation performance between two adjacent rooms within a building as measured within site conditions. The result achieved is affected not only by the separating element also by the surrounding structure and junction details.

Rating Method - Ctr
The Ctr adaptation term is a correction that can be added to either the RW (laboratory) or DnTw (site) airborne rating. The Ctr term is used because it targets the low frequency performance of a building element and in particular the performance achieved in the 100 - 315 Hz frequency range. This term was originally developed to describe how a building element would perform if subject to excessive low frequency sound sources, such as traffic and railway noise.

his rating is expressed as RW + Ctr and allows the acoustic designer to critically compare performances. The rating method has not been universally welcomed. Some acousticians believe that the method is too crude as it only considers the low frequency performance, and because site measurements at low frequencies are prone to difficulties, which can lead to a lack of confidence in the results achieved.

Rating Method - Lnw
This single figure rating method is the rating used for laboratory impact sound insulation tests on separating floors. The figure indicates the amount of sound energy being transmitted through the floor tested in isolation, in the absence of any flanking paths. With impact sound insulation, the lower the figure the better the performance.

Rating Method - LnTw
The single figure rating method that is used for impact sound insulation tests for floors. The figure indicates the sound insulation performance between two adjacent rooms within a building as measured on site. The result achieved is affected not only by the separating floor but also by the surrounding structure, e.g. flanking walls and associated junction details.

Rating Method - Dncw
The single figure laboratory rating method, which is used for evaluating the airborne sound insulation performance of suspended ceilings. Laboratory tests simulate the room-to-room performance of the suspended ceiling when a partition is built up to the underside of the ceiling with sound transmitted via the plenum.

If you are unsure of your buildings acoustic design and/or you require sound testing contact APT Sound Testing at: info@aptsoundtesting.co.uk. We can then advise on all types of acoustic design, whether it's accomplished during initial construction or during a refurbishment/renovation project. We have the technical experience to help identify and rectify your soundproofing or noise control problem, and/or you would like more information in regards to sound testing please follow our blog at: http://soundtestinguk.blogspot.co.uk or contact or visit our website at: www.aptsoundtesting.co.uk

Please feel free to contact APT Sound Testing on 01525 303905 or our London Office 0203 667 2650 to discuss your project and how we can help with your acoustic consultancy and sound testing requirements.

APT Sound Testing Services
Head Office: Sayells Farm, 7 Harlington Road, Upper Sundon, Bedfordshire, LU3 3PE

Sound Testing Services