Part E of the Building Regulations requires that walls and floors be sound tested between adjoining dwellings to ensure that they meet Part E regulations for acceptable amounts of noise.
The exact number of walls requiring testing for Part E will vary depending on the overall size of the development. However, a typical small to medium development (of under 10 dwellings with similar construction) will require testing that includes the following:
2 x airborne wall tests
2 x airborne floor tests
2 x impact floor tests
There are certain minimum requirements in the progress of the development that will impact our ability to perform sound insulation testing and the likelihood of a development passing.
Some general requirements for improving the chances of passing sound testing as well as conditions required for the sound insulation to take place include:
Windows & external doors must be installed, glazed and closed.
Ventilation systems should be installed and closed.
Internal doors should be hung.
Walls, floors and ceilings must be completed.
Skirting boards, electrical sockets and light switches should be fitted.
To test Impact sound transmission, there must be no cosmetic flooring fitted.
Rooms in which testing is to be carried out should be empty and tidy.
No trades should be working in the dwelling during the acoustic test.
Access to the properties on both sides of the separating partition is required.
There must be no noisy operations around the test properties during acoustic testing.
240v mains power is required within the dwellings.
What is an Airborne Test?
An airborne test is used to replicate audible airborne noise such as TV’s, music, human voices etc that could be transmitted from one dwelling to another.
The test is conducted by placing a large speaker in the larger room of the separating rooms (for repeatability purposes) this is called the ‘Source Room’. The speaker will generate pink or white noise at a very high level (typically around 95-110dB). The tester will record this in the room over 30 seconds (they can do this over a minimum of 5 standing/static positions or by ‘sweeping’) with a class 1 Sound Level Meter, this is a specialised/expensive piece of equipment.
Once these measurements are taken in the ‘source room’ the tester will go to the opposing room called the ‘receive room’ (this could be in the room below if a flat and the adjacent separating party wall in a flat or house). Once in the ‘receive room’ the tester will take 5 measurements over a minimum of 30 seconds (they can do a minimum of 5 static measurements or using the ‘sweeping’ method). This process is repeated with a 2nd speaker position (a minimum of 1,4m from the 1st speaker position). A background measurement is then taken in the ‘receive room’; this is to consider any natural background noise, which is considered in the calculation of the test.
Once this is completed the speaker is taken into the ‘receive room’ to carry out a reverberation test. The speaker will generate white or pink noise to the same levels as the ‘source room’ test. The speaker is set on for approximately 3-5 seconds (or as long as it takes to fill the room with a level band of noise), then the speaker is switched off.
The Sound Level Meter then measures how long the sound takes to decay. This process is repeated several times. The minimum number of measurements is 6 over 3 separate positions in the ‘receive room’. The measurements are making sense of the ‘receive room’ on how reverberant or absorbent the room is in relation to the original L2 receive measurement data.
The test is completed, and the result is a presented with singular number which is calculated using 16 different frequency bands in the 3rd Octave (human hearing frequency band).
The target for England, Wales and Northern Ireland is greater than or equal to 45dB DnT,w+Ctr for new buildings and greater than or equal to 43dB DnT,w+Ctr for material change of use (converted existing buildings).
Scotland Building Regulations does not require the +Ctr correction, and has the target of 56dB DnT,w for new-build construction and 54dB DnT,w for change of use construction.
The number given isn’t directly correlated to the amount of noise a human ear would hear due to some complicated mathematics.
This test measures the impact noise from a room above to measure the level of movement noise above, such as footfall and general banging / knocking noises. This test is only carried out where one dwelling (or a portion thereof) is directly above another.
An Impact test is carried out using a Class 1 Sound Level Meter and an Impact Machine (also known as a Tapper machine). The test is carried out between two habitable rooms (typically living rooms and bedrooms) of a separating party floor of flats / apartments / hotel rooms / HMO’s / care homes.
The Impact machine is usually rectangular in shape and approximately 50-80cm in length, 25cm-35cm in width and depth) it will sit on 3 legs that levitate the Impact Machine 40mm from the floor surface. 6 500g steel hammers will drop from the machine to make direct contact with the floor surface at a rate of 6 strikes per second. The machine is place in 4 positions in the room above (the source room). The Sound Level Meter is taken into the room below (the receive room) and measurements are taken over a minimum of 30 seconds (a minimum of 6 measurements in a static position or using the ‘sweeping’ method) (1-2 measurements per impact machine position). As per the Airborne test, a background measurement (s) is taken in the receive room and the reverberation measurements are taken to complete the test.
The test is completed, and the result is a presented with singular number which is calculated using 16 different frequency bands in the 3rd Octave (human hearing frequency band).
The target for England, Wales and Northern Ireland is lower than or equal to 62dB L’nT,w for new buildings and lower than or equal to 64dB L’nT,w for material change of use (converted existing buildings).
Scotland Building Regulations has the target of 56dB L’nT,w for new-build construction and 54dB L’nT,w for change of use construction.
Noble Homes have used ATTS Ltd to undertake their Air Testing for the past 10 years and we have always found them to helpful and professional. More recently we have used them for any required sound testing.
Noble Homes
We have used ATTS Ltd because we are confident in their expertise and importantly, they are reliable - if they agree an appointment, we know they will be there, they haven’t let us down once in the 10 years.
Saul Homes
Alex and his team are very helpful . Over the last few years ATTS Ltd have worked on our sites it’s a pleasure to work with them.
Cyden Homes
We have worked with Active Training & Testing Solutions for a number of years, the level of service Alex and his team provide is of the highest quality. The turnaround on work we request is prompt and the reports are also issued quickly.
Active Training & Testing Solutions are the only company we use for our requirements and we highly recommend them to our clients.
