Failed a Sound Test?

Failed a Sound Test?

If a client has failed a sound test, they often ask us for the reason why. It is almost certainly the result of a combination, of the following items:

  • Poor acoustic advice
  • Poor onsite installation
  • Flanking noise which comprises the sound insulating element.

Unfortunately, if you fail the sound testing its not easily rectified, as it usually means a major upgrade to the failed partition and thereafter another sound insulation test, which is both costly and time consuming.

If you do find yourself in this unfortunate situation, the first thing to do is contact APT Sound Testing your ‘friendly acoustic consultant’. We will be able to advise you on how to undertake minor acoustic upgrades, once we have obtained a copy of the failed sound test report. We can then ascertain the potential weak acoustic elements from the graphical results, and advise on a robust acoustic solution to building regulations Part E.

We will also be happy to liaise with your architect to ensure that all areas have been covered in the initial/remedial acoustic design. For a small fee we can visit site and undertake an ‘onsite design review’; or, do a an office based design review which cuts costs even further – to do this we would need all plans and sections relating to the project.

NoiseFlankingWall

Problems with airborne and structure borne sound are often associated with direct flanking transmissions through floors, supporting walls and other associated structures. You need to establish if your problem is due to direct transmission, flanking transmission or a combination of both so that the most effective remedial treatment can be chosen to suit.

First you need to understand how the sound is travelling into your home. It may be coming directly through the separating partition, i.e. wall or floor or it may be coming along another indirect route – called a noise flanking path. The most common such flanking path is the inner leaf of an external cavity wall.

If you have suffered a sound test failure and/or you require acoustic design advice then please email us in info@aptsoundtesting.co.ukor phone our design manager Darren on 07775623464. We have the experience, professionalism and acoustic know how to ensure that your project can achieve Part E of Building Regulations.

SOUND TESTING ON LONDON DEVELOPMENTS

 SOUND TESTING ON LONDON DEVELOPMENTS

London is a massive city containing over 8 million people. In this overcrowded environment it is essential that noise transference between adjoining properties in kept to a minimum for the occupant’s well being.

When there are problems with noise transference between dwellings, and the building’s design is called into question, we can offer advice on how to upgrade the wall and/or wall partition to improve the sound insulation values.

We have extensive knowledge regarding the way different materials and construction methods can influence the results of a sound test and subsequent noise transference, this helps to ensure your company achieves compliance with the Sound Testing for Part E of Building Regulations at pre completion stage.

Pre completion sound testing in London has been a mandatory requirement since July 2003. All new build properties and conversions which were built after this date require 10% of each party wall/floor construction type to be tested. Sound insulation testing is to be carried out between pairs of rooms separated by party walls and/or floors. In is usual to test between living rooms and bedrooms as these are classed as the two main habitable rooms; however, other rooms can be used if this is not possible such as study’s, kitchens and dining rooms.

Also, we are also experiencing a rise in the amount of sound testing that’s required to existing London buildings which isn’t surprising as the amounts of noise complaints to councils has doubled in the last 10 years, as a result we have carried out a large amount of sound tests in council/housing association blocks, where the residents are experiencing excess noise between the dividing wall and floor partitions.

We also undertake sound testing to existing flats where the lease stipulates that wooden floors should not be used instead of carpets and as a result of the change of floor finishes the noise levels have increased through the floors – especially the impact noise.  In all these instances we can undertake sound testing to highlight the existing noise levels so acoustic upgrades – if required) can be targeted and implemented, i.e. it may be as simple as installing an acoustic membrane on the floors below the timber floor.

sound testing equipment

The airborne sound testing is 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 vertically separated rooms, another type of sound test called Impact sound testing may also be required. This sound test is undertaken using a tapping machine 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 results (LnT,w) is calculated and compared to the requirements of Approved Document E of Building Regulations.

To help control noise issues APT Sound Testing can undertake UKAS accredited Part E sound testing in London and the South East. Our sound test engineers carry all the latest acoustic equipment. We provide full UKAS accredited sound insulation testing and air testing, so all or testing is completed to a strict quality controlled standard

If you would like advice on your acoustic design or sound testing in London, please contact us now at info@aptsoundtesting.co.uk or call us on 07775623464.

Sound Insulation Testing On New Build Dwellings In Compliance With the Code for Sustainable Homes

Sound Testing  On New Build Dwellings In Compliance With the Code for Sustainable Homes

Sound Testing is usually undertaken near the end of a project to show that the party wall and floors meet the Building Regulations. Approved Document E stipulated performance values.  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.

Detached houses don’t require sound insulation testing, however if the house has been built on to the end of an existing house and/or terrace it usually requires 2 airborne wall tests – 1 through the lower kitchen/lounge and one through the bedroom walls on the upper floors.

Buildings such as apartment blocks often require airborne and impact sound insulations tests. Airborne sound insulation testing is normally required between horizontally and vertically separated pairs of rooms i.e. the wall and floor partitions. 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.

Thereafter impact sound testing may also be required for vertically separated dwellings. Impact sound insulation testing 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.

When it comes to refurbishment projects i.e. large houses converted into flats and/or an office block into flats we can undertake a sample sound test of the existing wall and floor construction. Once we have established the sound levels for the existing construction we can then look at extent of the acoustic upgrades to attain Part E Compliance. This is much more effective than just forwarding an acoustic design that may be to excessive and expensive, especially when the existing construction is already ‘acoustically’ robust and therefore only needs to improve by a 1-3dB.

sound testing

The sound insulation levels required to pass Part E are usually 45dB for airborne wall and floors and 62dB for Impact Sound Testing on new build, however sometimes a higher target may be required in-line with the Code for Sustainable Homes; this is usually in defined in the following figures +3, 5 & 8dB, this means if its plus 5dB you will need to achieve 50dB for airborne and 57dB for impact sound testing.  Obviously if you need to comply with the Code for Sustainable Homes then special attention must be shown to the acoustic design from the offset to reduce the chance of sound testing failure.

APT Sound Testing can help you to achieve this more robust design criterion. We can also help if your building fails the sound insulation testing by offering a targeted acoustic design solution saving time and potential costs.

If you have a project that requires sound insulation testing then contact us now, we can propose a sound testing schedule that should comply with Part E. Please contact us at: info@aptsoundtesting.co.uk or call us at 07775623464

GOOD ACOUSTIC DESIGN & CONSTRUCTION TO PASS SOUND TESTING

 GOOD ACOUSTIC DESIGN & CONSTRUCTION TO PASS SOUND TESTING

There are many misconceptions when it comes to acoustics. Unfortunately; by simply constructing a good separating wall or floor this may not in itself provide sufficient sound insulation to pass the sound testing for Part E, as the junctions of each separating wall and/or floor with other parts of the building are equally as important. There may be other potential issues such as flanking sound transmission that can occur via construction components such as:

  1. the internal partitions
  2. the inner leaf of the external wall
  3. the external wall cavities
  4. the external façade or outer leaf
  5. the roof structure
  6. the foundations.

When undertaking the overall design and construction, the overall acoustic system should be considered and not just the separating wall or floor partitions.  Flanking sound transmission may in some cases be the dominant pathway between adjoining dwellings, especially in existing buildings where you are planning to convert offices/large houses into flats where there are large existing penetrations through the floors. In all instances it is essential that acoustic isolation is provided, between all acoustic partitions – both wall and floor.

Acoustic Design Advice

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.  We can undertake acoustic design reviews of floor and wall partitions too ensure that the sound insulation testing passes at the first attempt. We can also undertake facade testing to ISO 140-5, to ensure the design of your building envelope is acoustically robust, as this can also add to sound testing failures even if the internal partitions are acoustically robust.

If you would like more information in regards to sound testing please follow our blog at: http://soundtestinguk.blogspot.co.uk or contact us at: info@aptsoundtesting.co.uk or visit our website at: www.aptsoundtesting.co.uk

Sound Testing On Refurbishment Projects

Sound Testing On Refurbishment Projects

When it comes to refurbishment projects i.e. large houses that have been converted into flats and/or an office block into flats, we can undertake a sample sound test of the existing wall and floor construction to ascertain the existing sound insulation levels. Once we have established the sound levels for the existing construction, we can then look at extent of the acoustic upgrades to attain Part E Compliance. This is much more effective than just forwarding an acoustic design that may be to excessive and expensive, especially when the existing construction is already ‘acoustically’ robust and therefore only needs to improve by a a minimal amount such as 1-3dB. By having the existing sound levels of the partitions we can recommend targeted, acoustic upgrades to comply with Building Regulations Part E.

This Video show some of the sound leakage paths

The sound insulation levels required to pass Part E for refurbishment projects are less stringent than new build projects. Instead of 45dB for airborne its 43dB (2 dB less), and for instead of 62dB for Impact Sound Testing its 64dB on new build (2 dB more).

On refurbishment projects you cannot use Robust Details, therefore sound testing has to be undertaken. Obviously due to the complex nature of refurbishment projects its best if you consult with us at the beginning as we can offer advice on how to upgrade the partitions to pass the sound testing.   We can also help if your building fails the sound insulation testing by offering a targeted acoustic design solution saving time and potential costs.

If you have a project that requires sound insulation testing then contact us now, we can propose a sound testing schedule that should comply with Part E. Please contact us at: info@aptsoundtesting.co.uk or call us at 07775623464

Sound Insulation Testing In Compliance With Building Regulations Part E.

Sound Insulation Testing In Compliance With Building Regulations Part E.

Sound Testing is usually undertaken near the end of a project to show that the party wall and floors meet the Building Regulations. Approved Document E stipulated performance values.  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.

Detached houses don’t require sound insulation testing, however if the house has been built on to the end of an existing house and/or terrace it usually requires 2 airborne wall tests – 1 through the lower kitchen/lounge and one through the bedroom walls on the upper floors.

Buildings such as apartment blocks often require airborne and impact sound insulations tests. Airborne sound insulation testing is normally required between horizontally and vertically separated pairs of rooms i.e. the wall and floor partitions. 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.

sound testing

Thereafter impact sound testing may also be required for vertically separated dwellings. Impact sound insulation testing 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.

Impact Sound Testing

When it comes to refurbishment projects i.e. large houses converted into flats and/or an office block into flats we can undertake a sample sound test of the existing wall and floor construction. Once we have established the sound levels for the existing construction we can then look at extent of the acoustic upgrades to attain Part E Compliance. This is much more effective than just forwarding an acoustic design that may be to excessive and expensive, especially when the existing construction is already ‘acoustically’ robust and therefore only needs to improve by a 1-3dB.

The sound insulation levels required to pass Part E are usually 45dB for airborne wall and floors and 62dB for Impact Sound Testing on new build, however sometimes a higher target may be required in-line with the Code for Sustainable Homes; this is usually in defined in the following figures +3, 5 & 8dB, this means if its plus 5dB you will need to achieve 50dB for airborne and 57dB for impact sound testing.  Obviously if you need to comply with the Code for Sustainable Homes then special attention must be shown to the acoustic design from the offset to reduce the chance of sound testing failure.

APT Sound Testing can help you to achieve this more robust design criterion. We can also help if your building fails the sound insulation testing by offering a targeted acoustic design solution saving time and potential costs.

If you have a project that requires sound insulation testing then contact us now, we can propose a sound testing schedule that should comply with Part E. Please contact us at: info@aptsoundtesting.co.uk or call us at 07775623464

DESIGNING YOUR BUILDING TO PASS PART E SOUND INSULATION TESTING

Designing your Building to Pass Part E Sound  Insulation Testing

We at  APT Sound Testing 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 insulation 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.

ACOUSTIC_DESIGN

Unfortunately, general exposure to excess amounts of 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.

If you are unsure of your buildings acoustic design and/or you require sound testing contact APT Sound Testing at: info@aptsoundtesting.co.uk or call us on 07775623464

ACOUSTIC DESIGN FOR PRECOMPLETION SOUND TESTING

ACOUSTIC DESIGN FOR PRECOMPLETION SOUND TESTING

It’s extremely important that careful consideration is given to the acoustic design for pre-completion sound testing at an early stage of the design and construction process. It can be very problematic if the building fails the pre-completion sound testing just before buildings due to hand over.   To try and reduce the chance of a sound test failure APT can visit site to conduct a comprehensive acoustic design survey and  review. We also take this opportunity to meet; the site/project manager, architects etc. to go through the building’s design, site constraints and most cost effective method of achieving Part E of Building Regulations.

Our proactive acoustic design service, takes into account the build-ability, programme time and material cost. We ensure the relevant parties are fully aware of the installation detail required, highlighting possible ‘onsite’ construction problems and their prevention to achieve a successful installation and building sign off.

PROACTIVE SITE SUPPPORT

Once we have completed the acoustic design report our services don’t finish there. We provide the site team with on-going design support. You will have direct contact with the allocated acoustician from the start of the process through to the successful completion of the project.

Once the part of the building is completed we can undertake sample sound testing to ensure the design and onsite construction methods are sufficient to achieve a Part E sound test compliance.

THE DIFFERENCE BETWEEN LABORATORY AND ONSITE SOUND TESTING

Unfortunately, it is very difficult to construct acoustic details to the stringent standards of the laboratory. When the construction assembly is tested in the lab, it is also certified and an exact description of the materials and the installation techniques are described in detail and followed to the letter, obviously this should be replicated on the your site as closely as possible. However, it is not always possible to replicate the exact conditions on the job-site compared to the ideal conditions normally present in a lab setting, which is the reason why a 5dB point difference is allowed between the construction design on paper and the actual on site construction performance.

NOISE FLANKING

To try and work out if you have flanking sound you first need to understand how the sound is travelling into your home. It may be coming directly through the separating partition, i.e. wall or floor or it may be coming along another indirect route – called a flanking path. The most common such flanking path is the inner leaf of an external cavity wall.

Problems with airborne and structure borne sound are often associated with direct flanking transmissions through floors and supporting walls and other associated structures. It is essential to establish if your problem is due to direct transmission, flanking transmission or a combination of both so that the most effective remedial treatment can be chosen. If you are unsure where the sound is getting through, then contact us as we should be able to identify the worst areas by undertaking sound testing on the problematic partitions.

NoiseFlankingWall

Unwanted noise travelling along flanking paths makes the building structure vibrate and this causes the sound to radiate into your room. One solution is to build another wall or ceiling in front of the original, but not connected to it (often called an independent wall or ceiling). APT can help to locate the flanking sound and propose a cost effective design that will satisfy Part E of Building Regulations.

If you would like more information in regards to sound testing please also follow our blog at: http://soundtestinguk.blogspot.co.uk/, or contact us at: info@aptsoundtesting.co.uk or phone us on 07775623464 or visit our website at: www.aptsoundtesting.co.uk

OUR SOUND TESTING & NOISE SURVEY SERVICES

A SUMMARY OF OUR SOUND TESTING & NOISE SURVEY SERVICES.

Here at APT Sound Testing our clients often ask for a summary of our sound testing and noise survey services we undertake in compliance with Part E of Building Regulations . 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 various noise surveys to comply with the following:

  • Noise Surveys 8233 for Planning Applications.
  • Background Noise Surveys for Air Conditioning Plant.
  • Industrial Noise Surveys

The sound insulation levels required to pass Part E are usually 45dB for airborne wall and floors and 62dB for Impact Sound Testing on new build and 43dB for airborne wall and floors and 64dB for Impact for converted properties. Sometimes a higher target may be required in-line with the Code for Sustainable Homes; this is usually in defined in the following figures +3, 5 & 8dB. Obviously if you need to comply with the Code then special attention must be shown to the acoustic design from the offset. APT Sound Testing can help you to achieve this more robust design criteria. We can also help if your building fails the sound insulation testing by offering a targeted acoustic design solution saving time and potential costs.

sound testing

The amount of sound testing 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. Sometimes more tests may be required if you have many different types of walls and floors, however we will always try to propose the minimum testing required to comply with Part E.

Impact Sound Testing

We also offer planning noise surveys comply with BS8233 and BS4142, this allows us to provide all you acoustic requirements in one easy package; reducing cost and improving onsite co-ordination. Air Pressure Testing is UKAS accredited to undertake both Sound and Air Tightness Testing and is also accredited to ISO 17025:2005 ‘General requirements for the competence of testing and calibration laboratories’

 If you have a project that requires sound insulation testing and you are unsure how to comply with Part E of Building Regulations then contact us now, we can propose a sound testing schedule that should comply with Part E. If you are unsure of your projects acoustic requirements please click here at; info@aptsoundtesting.co.uk or visit our website at www.aptsoundtesting.co.uk  or call us at 07775623464