Simple Acoustic Floor and Wall Upgrades

Simple Acoustic Floor and Wall Upgrades 

There are many quick and simple acoustic wall and floor upgrades to help you achieve compliance with Build Regulations Part E. One of the easiest wall solutions is to install a 70mm met-sec partition in front of the existing wall abutting dwellings. Firstly leave approx. 25mm gap between the back of the met-sec and the existing wall. Then install 50mm acoustic wool to the inside of the met-sec and add two layers of soundboard to the outside of the met-sec frame, ensuring all boards are properly lapped and ensure the perimeter joints are kept back from the surrounding construction and filled with acoustic mastic. Also make sure that all sockets etc. are placed in a different position to the sockets on the other side of the wall to prevent noise transference.

Acoustic_Ceiling_Upgrade

To reduce airborne and impact sound transmission through the floor, one simple solution is to add a timber baton to the bottom of the joists. Then add an acoustic resilient hanger. To the inside of the newly formed void add an AW 25 Isowool acoustic insulation. To the underside of the hangers install 2 x 12.5mm layers of soundboard. Allow for the correct laps in the plasterboard and and ensure the perimeter joints are kept back from the surrounding wall construction. Add AW100 Isowool to the centre joist void and to the top of the joists install 18mm flooring. To the top of the flooring add a 4mm resilient matt.

The above Air and Wall solutions should help your project comply with Approved Document E for Sound Testing in London. If you have a project that’s needs acoustic design advice or needs sound insulation testing then please contact us at: info@aptsoundtesting.co.uk and we should be able to offer you an expedient acoustic solution to help you achieve practical completion.

Noise Flanking Can Lead to Sound Test Failure

Noise Flanking Can Lead to Sound Test Failure

Noise flanking can be a huge problem and one of the main causes of excessive sound transmission. If your project fails the sound testing, more often than not noise flanking will be the culprit.

To get an understanding for why the acoustic partitions are performing poorly a detailed diagnosis and invasive investigation, such as the removal of some of the wall and floor partitions will usually need to take place. In many cases a large amount of noise flanking is due to serious design faults such as the use of lightweight blocks in the construction of the walls in an apartment development, this allows the sound to travel along the walls and floors from dwelling to dwelling. In many cases a wall and/or floor partition may have a very good acoustic design and construction; however the partition will still fail as the sound is travelling along a noise flanking path.

Sound_Insulation_Test_London

We often get asked what ate the main reasons noise flanking on new and existing dwellings, in our experience they are:

  1. Where lightweight blocks used in the inner envelope construction. This allows sound to travel along the lightweight blocks both vertically and horizontally from dwelling to dwelling.
  2. Through dividing floors if there is lack of mass or acoustic insulation has not been installed and/or or direct fixing of plasterboard and/or floorboards to joists without using a resilient ceiling construction and/or floating floor.
  3. Through Windows if they are no double glazed or have secondary glazing as a minimum
  4. Through Fixtures & fittings such as light switches, telephone outlets and TV cable ducts where they sit back to back against the adjoining property.
  5. Along structural joints along the perimeter wall and floor joint. These areas should be filled with acoustic mastic)
  6. Structural steels that run through one property to the other without material isolation, i.e. plasterboard is screwed directly to the steel offering little or no noise isolation.

There are many quick and simple solutions to improve the acoustic performance of dividing wall partitions. One of the easiest wall solutions is to install a met-sec partition in front of dividing partition.

If you have a project that’s needs acoustic design advice or needs sound insulation testing then please contact us at: info@aptsoundtesting.co.uk. We should be able to offer you an expedient acoustic solution to help you achieve practical completion.

Good Tips on How to Pass Your Sound Testing

Good Tips on How to Pass Your Sound Testing

We thought we would offer some good tips on how to pass your sound testing at the first attempt. The first stage is to ensure that you design the building correctly using the correct acoustic details and materials.

It is also essential that acoustic materials are installed in accordance with manufacturer’s guidelines. There are many potential poor acoustic scenarios that can increase the chance of sound test failure, they are:

  1. Ensure no noisy building work is taking place during the sound testing as excess background noise levels can have adverse effect on the results.
  2. You must fit doors and windows before the test is carried out, to stop noise transference.
  3. Ensure that all doors and windows are shutting properly and rubber seals are properly installed.
  4. Do not directly fix screw plaster board into joists, when using Resilient Bars; ensure that they are fitted in strict accordance with manufacturer’s recommendations.
  5. Do not directly nail or screw through an Acoustic Floor always follow manufactures guidelines and use the correct fixing method.
  6. Ensure you use acoustic insulation with the minimum required density and it fills at least 100mm of the joist void.
  7. Ensure all penetrations such as heating pipes are sealed where they terminate through the floors.
  8. Ensure that acoustic insulation is also packed around service pipe work.
  9. If installing floating screed ensure all isolation layer joints are overlapped and taped.
  10. Ensure that the Acoustic floor is fitted with staggered joints.
  11. Ensure all the Acoustic floor is sealed watertight even around heating pipes.
  12. Ensure that the plasterboard on any walls is complete right down to sub-floor, seal all gaps.
  13. Ensure you use the isolation tape around the wall of each room.
  14. Ensure plasterboard is fitted with staggered layers and all joints sealed.
  15. Ensure all Fireplaces are blocked up with brick or plasterboard.
  16. Ensure that any RSJ’s or supporting steel work is fully insulated and isolated from the main structure.
  17. Ensure all waste pipe service runs are boxed in with insulation and plasterboard.
  18. Do not fit carpets or laminated flooring before you have passed the test.

Acoustic Design Advice

If you need help with sound insulation testing on your project contact us at: info@aptsoundtesting.co.uk or phone us on 07775623464. We have the technical experience to help identify and rectify your soundproofing or noise control problems.

How Many Sound Tests Do I Need On My Project

How Many Sound Tests Do I Need On My Project?

Our clients often ask ‘how many sound tests do I need on my project’. Part E stipulated that one set of sound tests needs to be undertaken for every ten flats or houses, provided the construction system is the same. A set means that the test should include two locations where the party element (wall or floor) is tested. This is equivalent to two individual tests when assessing the performance of a wall this means 2 airborne wall, 2 airborne floor and 2 impact sound tests as a minimum wherever possible. All tests must be undertaken between habitable spaces (e.g. bedrooms, living rooms) and not to or from common spaces such as stairwells and corridors.

Acoustic Design Advice

Approved Document E 2003 also states that a minimum of 10% of all party walls and floors is sound tested for every type of construction or sub-group, this means where there a variations in the construction of the floors and/or walls may occur then further testing may be required. The amount of sound tests required for each type of development is:

Houses:

On houses two airborne sound insulation tests on a pair of separating walls would be required.

Flats:

On flats a 6 Pack would normally be required, this would usually comprise of two airborne sound insulation tests on separating walls; two airborne sound insulation tests of separating floors and two impact sound transmission tests of separating floors

Rooms for Residential Purposes:

On student accommodation, hotel rooms & care homes a set of tests would usually comprise of one airborne sound insulation test of a separating wall; one airborne sound insulation test on a separating floor and one impact sound transmission test of a separating floor.

If you are unsure of the amount of sound tests required on your development, please contact us now at: info@aptsoundtesting.co.uk or call me direct on 07775623464.

Minimising Noise Flanking Transmission to Pass Sound Tests

Minimising Noise Flanking Transmission to Pass Sound Testing

One way to reduce the chance of noise flanking transmission/s to pass the sound testing for Part E of Building Regulations is to carefully look at the acoustic details at the design phase of the project, as well as good planning and workmanship thereafter. Unfortunately, by simply specifying high performance wall and floor partitions between dwellings is no guarantee to a sound isolation and subsequently successful sound testing.

Sound travels along the path of least resistance between rooms, usually through any penetrations/air leaks or through rigid and poorly isolated connections in the structure itself, these routes are called noise flanking paths.

  • Wide gaps below doors provide a flanking noise pathway.
  • Air leakage around partition walls at the wall/ceilings junction.
  • Sound leaking through ‘lightweight’ hollow-core doors.
  • Through ductwork penetrations between two rooms or boiler cupboards placed back to back.
  • Fixtures & Outlets – Light Switches, Telephone Outlets, and Recessed Lighting Fixtures (if penetrations have been cut back to back with the opposite dwelling under test)
  • Poor sound isolation between floors, if subfloor wooden planking extend beneath the dividing floor partition and into an  adjoining dwelling this will form a sound flanking pathway.
  • Framing connections that include solid framing members passing between building areas such as oak beams where large old houses have ben subdivided.
  • Poor isolation to partition abutments to adjoining walls, ceilings, floors
  • Service penetrations behind back to back kitchens, such as soil stacks, waste and recessed pipework.
  • 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)
  • 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)
  • 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).
  • Recessed light fixtures that pass through the plasterboard and acoustic insulation.
  • The wrong fixings used during the installation of resilient channel systems, i.e. drywall screws that are too long that penetrate into the ceiling joists.
  • Window noise transmission due to poor performance glass etc.
  • Door noise transmission due to the inclusion of lightweight hollow core doors, with large gaps to the bottom of the door threshold.
  • On bathroom partitions, install drywall all the way to the floor before installing the bath and seal all plumbing penetrations through walls with a flexible sealant.

NoiseFlankingWall

If the wall/floor partitions have poor isolation and can greatly reduce the effectiveness of soundproofing efforts and can lead to sound test failures. Even if your construction allows for ‘robust’ sound insulation ratings, it will be rendered useless, if sound can pass easily through service penetrations in the walls and floors or through lightweight doors.

APT Sound Testing offers both pre & post construction design solutions to achieve the required sound isolation requirements of Part E of Building Regulations.

We offer an acoustic onsite inspection service to ensure that the sound insulation elements are being installed as per manufactures guide lines and the quality of the workmanship is consistent with ‘best practice’ noise control procedures and we have the technical experience to help identify and rectify your soundproofing or noise flanking problem/s.

If you would like more information in regards to sound testing, please contact us at: info@aptsoundtesting.co.uk or call us direct on 07775623464

Should I inform my Neighbours of the Sound Testing?

Should I inform my Neighbours of the Sound Testing?

Your neighbours will need to be contacted if access is required to their properties to complete the sound testing. Also as the sound levels produced during the test are very high it would be ‘neighbourly’ to inform the residents as they are likely to hear the test. If your project is a new build and/or a change of use and its built onto an existing property then chances are you will be required to undertake an airborne wall test. We recommend that you check this with your local building control officer prior to the testing so you can plan access to the neighbouring properties accordingly.
Can I Observe the Sound Testing?

sound testing equipment

APT Sound Testing will happily give you a brief demonstration and overview of the test, if so required; however, during the actual sound testing, we will need to follow stringent rules which restrict extra personnel within the test areas.
I want peace of mind that I’ll pass the sound testing

Poor Sound test results can occur for many reasons. The most common factor influencing acoustic performance is poor workmanship. Detailing is critical to maximising on site acoustic performance, especially in floor and wall isolation and appropriate party wall and floor construction. If inadequate provision for the isolation of materials is not undertaken

Should I inform my Neighbours of the Sound Testing? 

The Correct Site Conditions for Sound Testing

 The Correct Site Conditions for Sound Testing 

To undertake accurate sound testing, we require the site noise levels to be kept to a minimum. During the sound insulation testing, our equipment produces high levels of noise – between 100-110dB! However, to record accurate test measurements, relatively quiet conditions are required on site throughout the testing. Any site operatives working in the testing area will have to leave temporarily and any noisy works in the vicinity of the test areas including external site activity such as groundworks, drilling and banging will need to be halted. 

We also require full access to all the rooms being tested. We provide a full testing schedule within our quotation which will clearly identify suitable couplings of test rooms which may require access to adjoining neighbours dwellings to enable us to complete the sound testing

APT Sound Testing will try to schedule the sound testing with you at a time when noise can be controlled to achieve the best possible testing results. 

sound testing

What’s the Duration of the Sound Testing? 

The time taken to undertake sound testing varies from project to project as no site is exactly the same. Taking into account standard site conditions a set of tests on houses -two airborne walls will take one to two hours. A six pack of tests on flats – 2 airborne walls, two airborne floors and two impact tests will take between two to three hours. Throughout the sound testing, we will require full free uninterrupted access to the units/rooms in all test areas. 

If you require more information on sound testing, please contact us now at info@aptsoundtesting.co.uk or phone me direct on 07775623464.

What Types of Sound Testing Do I Need

 

What Types of Sound Testing Do I Need 

Sound Testing needs to be carried out between pairs of rooms separated by party walls or floors. In most cases, the rooms to be sound tested will be the two main habitable rooms – living rooms and bedrooms. All new build dwellings and conversions which were built after this 2004 are required to have 10% of each party wall/floor construction type to be tested.

 

The sound test procedure involves setting up a noise source in a room on one side of the party wall or floor and measuring the noise on both sides of the partition. The three types of Sound Tests usually required – depending on the project configuration) are:

sound testing equipment 

Airborne Wall Tests

Airborne wall sound tests may be required between separate dwellings where a lounge and/or bedroom are positioned against the dividing wall partition. 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.

 

Airborne Floor Tests

For vertically separated dwellings, airborne floor sound testing may be required, where a lounge and/or bedroom sit’s against the dividing floor partition above and/or below a ‘habitable’ room. 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.

 

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.

 

Non-Residential Sound Testing

It is worth noting that sound insulation testing may also be required in non-residential buildings such as schools, hospitals, workplaces, whereas built performance needs to be demonstrated to ensure noise sensitive areas (e.g. classrooms, wards, meeting rooms) are suitably insulated from noisier areas or to comply with BB93 & BREEAM requirements.

 

Sample Sound Testing

If you have an existing building that you are about to convert info flats etc. and need to establish the acoustic performance of the existing partitions, we can undertake sample sound testing on walls and floors to check the sound insulation performance. Thereafter we can forward a targeted acoustic design to comply with Part E of Building Regulations, as well as undertaking the final pre-completion sound testing.

 

All APT’s test engineers carry the latest Norsonic equipment, which are class one rating all of our acoustic testing/sound testing is completed to a strict quality controlled standard. We provide full ISO & UKAS complaint sound testing.

If you would like more information in regards to your air and sound testing please contact us now at info@aptsoundtesting.co.uk or call us on 07775623464

 

controlled standard

Our Pathway to Successful Sound Testing

Our Pathway to Successful Sound Testing

Sound Insulation Site Audits

We can undertake acoustic site audits, to let us view the existing site construction. This allows us to check for potential problematic areas such as the inclusion of lightweight blocks within the existing wall 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 can also undertake sample sound insulation testing of the existing construction. This offers an accurate overview of the acoustic performance of the existing partitions, which enables us to offer a targeted acoustic design which takes into account the performance of the existing construction.

 Acoustic Design Advice

Acoustic Defect Diagnosis & Remedial Advice

With many 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. poor material isolation.

Precompletion Sound Testing

To help enforce good acoustic design principles pre-completion sound testing was introduced July 2003, this resulted in all new build properties and conversions which were built after this date are require 10% of each party wall/floor construction type to be tested.

Precompletion Sound Testing is carried out between pairs of rooms separated by party walls or floors. The two ‘habitable’ areas that usually require sound testing are living rooms and bedrooms, although other rooms can be tested if this is not possible, i.e. kitchen to bedroom.

sound testing equipment

If you need sound insulation testing and acoustic design, please don’t hesitate to contact us at info@aptsoundtesting.co.uk  or call me on 07775623464

IMPROVING SOUND INSULATION ON LONDON REFURBISHMENT PROJECTS

IMPROVING SOUND INSULATION ON  LONDON REFURBISHMENT PROJECTS

Many of our new clients ask ‘ how can we improve our sound insulation on our London Refurbishment projects’. One of the main problems is that a large number 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 well being 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.

Video Showing Main Noise Transference Points Through Existing Partitions.

Improving Existing Floor Partitions

In our experience of undertaking hundreds of sound insulation tests in London, 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

 Failed_sound_Testing_Due_to_existing_floor_Construction_

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

Simple_floor_upgrade_to_Pass_Sound_Testing

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