A well-built property should be comfortable, energy efficient and able to keep unwanted air leakage under control. This is where air tightness testing plays an important role.

At APT Sound Testing, we provide professional air tightness testing across the UK, working on everything from individual homes and housing developments to large commercial buildings. We are one of the few UKAS-accredited companies able to carry out both air and sound testing to the relevant Building Regulations and standards.

Because our engineers are qualified to carry out multiple types of testing, we can often complete air, sound and ventilation testing during the same visit. This can save our clients money, reduce disruption and make site coordination much easier. Unlike many testing companies, we also carry out our own work rather than subcontracting it.

What is air tightness testing?

Air tightness testing, sometimes referred to as an air permeability test or blower door test, measures how much uncontrolled air leakage occurs through a building’s envelope.

Every building needs some ventilation, but uncontrolled air movement through gaps, cracks and joints in the building fabric can waste energy. These unwanted gaps are commonly experienced as draughts.

During an airtightness test, specialist blower door equipment pressurises or depressurises the building. The equipment measures the airflow required to maintain a set pressure difference between the inside and outside of the building. This allows the building’s air leakage rate to be calculated.

The more airtight a building is, the less conditioned air it loses unnecessarily. This can reduce energy consumption, lower carbon emissions and reduce the demand placed on heating, cooling and mechanical ventilation systems.

Why is air tightness testing important?

Air tightness testing became a legal requirement for many new buildings in England and Wales in 2006 under Part L of the Building Regulations.

Part L covers the conservation of fuel and power and includes requirements for the energy performance and air permeability of buildings. For domestic projects, Part L1A is generally applicable to new dwellings, while Part L2A relates to new non-domestic buildings.

The required air permeability target depends on the building type and design. A common target for a standard dwelling is around 5.0 m³/hr/m² at 50 Pa, although the required figure depends on the specific project. Commercial buildings can have significantly lower target air permeability rates, often around 3.0 m³/hr/m² or below.

Meeting the required target is important for achieving Building Control approval and demonstrating that the building has been constructed in accordance with its design requirements.

Where does air leakage occur?

Air leakage can occur almost anywhere there is an unintended gap or break in the building envelope.

Common problem areas include:

• Around windows and doors
• Service penetrations
• Floor and wall junctions
• Roof and ceiling junctions
• Electrical sockets and fittings
• Pipe and cable penetrations
• Around ventilation systems
• Poorly sealed joints
• Gaps between construction materials

One challenge is that individual leaks can be difficult to see. A building may have dozens, or even hundreds, of relatively small leakage paths which collectively have a significant effect on its overall air permeability.

This is why testing during construction, rather than waiting until the very end of a project, can be so valuable.

Air leakage, condensation and moisture

Uncontrolled air movement can cause more than just wasted energy.

In winter, warm, moist indoor air can pass through gaps in the building fabric and reach colder areas within walls, floors, or roofs. Depending on the construction and conditions, this can contribute to condensation and potentially lead to mould, damp or deterioration of building materials.

During warmer or more humid periods, unwanted infiltration can also introduce humid outdoor air into a building.

A properly designed and constructed air barrier helps control where air enters and leaves the building. This makes it easier to manage energy use, indoor comfort and moisture movement.

How much heat can be lost through air leakage?

The amount of heat lost through air leakage varies considerably depending on the building, its construction and the extent of the leakage.

Poor airtightness can significantly contribute to heat loss and increase the energy required to maintain comfortable indoor temperatures. In some poorly performing buildings, uncontrolled air leakage can account for a substantial proportion of overall heat loss.

An air tightness test provides measurable information about building performance rather than relying on assumptions.

What does an air tightness test tell you?

A blower door test does more than provide a pass-or-fail result.

The test measures the amount of air moving through the building at a known pressure difference. This information helps you understand how well the building envelope is performing and, when needed, investigate individual leakage paths.

Finding air leakage paths

One of the biggest advantages of testing is that it can help identify areas where air is escaping or entering the building.

At APT Sound Testing, our engineers can use techniques such as smoke testing alongside blower door testing to help locate leakage paths.

Sometimes one or two relatively large gaps cause the problem. More often, however, a building’s overall air leakage results from numerous smaller defects spread throughout the building.

Finding these issues before completion allows contractors to seal them and improve the building’s performance before the final test.

Improving energy efficiency

Every time conditioned air escapes a building, replacement air must be heated or cooled. The greater the uncontrolled air leakage, the greater the potential energy requirement.

Air tightness information can therefore be useful when considering energy consumption, heating and cooling requirements and the overall performance of the building.

Improving occupant comfort

Draughts can noticeably affect the comfort of people using a building.

Cold air entering through unintended gaps can create uncomfortable conditions, particularly in homes, offices and other occupied spaces.

We have previously investigated buildings where occupants were experiencing significant comfort problems. In one case, testing identified an air leakage rate of approximately 25 m³/hr/m². Once the leakage paths were identified and sealed, the building achieved an air permeability below 5 m³/hr/m², significantly improving its performance.

Reducing the risk of moisture problems

Uncontrolled air movement can carry moisture through parts of the building fabric. Depending on the construction, this can contribute to condensation and other moisture-related problems.

Good air barrier design and careful construction can reduce these risks by controlling where air can move through the building envelope.

Controlling outdoor pollutants

Air leakage can also allow outdoor pollutants to enter a building through uncontrolled routes.

For properties close to busy roads, garages, commercial premises, restaurants or other potential pollution sources, this can be an important consideration. A well-designed and properly constructed air barrier helps provide greater control over where outdoor air enters the building.

When should you carry out an air tightness test?

Although the final air tightness test is normally carried out before completion, we recommend considering air permeability from the earliest stages of a project.

Consider the design of the building’s air leakage line alongside the construction details. Everyone involved in the project should understand where the air barrier is located and how it will be maintained around junctions, openings, and service penetrations.

Early testing can also be extremely useful.

If an initial test identifies problems while the construction team is still on site, leakage paths can usually be repaired more easily than after the building is complete.

Air tightness consultancy and design reviews

At APT Sound Testing, our involvement doesn’t have to start on the day of the final test.

We provide air tightness consultancy and design reviews to help clients identify potential problems before they become expensive to fix. We can work with project teams throughout the design and construction process, providing practical advice on reducing unwanted air leakage and achieving the required target.

Our experience across a wide range of residential and commercial developments means we understand the practical challenges that can affect air permeability results.

We also provide guidance to help contractors prepare for testing, including our air tightness checklist.

Combine air and sound testing to save time and money

One advantage of working with APT Sound Testing is that our engineers are UKAS accredited to carry out both air and sound testing.

This means we can often combine testing into a single planned visit.

For many projects, our clients use our three-step pre-completion testing package, reducing the need to coordinate several different testing companies.

Combining tests can provide:

• Reduced testing costs
• Fewer site visits
• Less disruption to the construction programme
• Easier site coordination
• A single point of contact for multiple testing requirements

Where required, we can also arrange out-of-hours testing, including Saturdays and Sundays. This can be particularly useful on busy commercial developments where testing during normal working hours could disrupt other trades or occupants.

Why choose APT Sound Testing?

We have extensive experience carrying out airtightness testing on developments throughout London and across the UK.

Our team understands building regulations requirements and the practical challenges of achieving an airtight building. Rather than arriving only to carry out a final test, we can work with your project team throughout the design and construction stages to help identify potential issues before they become problems.

Whether you need a final compliance test, early-stage testing, leakage investigation or advice on your air barrier design, our experienced engineers can help.

If you are planning a new residential or commercial development and need advice on airtightness testing, get in touch with the APT Sound Testing team. We can discuss your project, explain what testing is required and help you plan for a successful result.

Need help preparing for your air tightness test? Contact our team by calling 01525 303905 or by using our online contact form.

The post A Guide to Air Tightness Testing appeared first on SoundTesting Services UK.

At APT Sound Testing, we have completed thousands of Level 3 Thermographic Surveys across London, the Home Counties and the South of England. Our thermal imaging surveys help clients identify heat loss, air leakage, moisture intrusion, insulation defects and other building performance issues.

Although modern thermal imaging cameras are highly sophisticated, accurate, meaningful results depend on more than using high-quality equipment. Environmental conditions at the time of the survey can have a significant impact on the quality and interpretation of thermal images.

Even an experienced thermographer requires suitable temperature differentials, stable weather conditions and appropriate survey timing to identify thermal anomalies accurately. Understanding the environmental factors that influence thermal imaging is therefore essential to produce reliable, actionable results and avoid misleading readings.

Optimum Weather Conditions for Thermal Imaging Inspections

To achieve the most accurate results from a thermal imaging survey, consider several environmental factors.

Weather Conditions

Where possible, thermal imaging surveys should be carried out during stable weather conditions. Rain, fog, and high humidity can affect image quality and make it harder to interpret thermal patterns accurately.

For this reason, we aim to avoid surveying during periods of adverse weather wherever possible.

Sunlight Exposure

Direct sunlight can significantly influence the temperature of building surfaces and potentially mask or distort thermal anomalies. For external thermal imaging inspections, surveys are therefore best undertaken when solar influence is minimal.

Early morning or late evening are generally the best times, depending on the season and the survey’s specific requirements.

In winter, this typically means surveying from around 6:00–7:00 am, while in summer an earlier start of around 4:00–5:00 am may be necessary to minimise solar loading.

Temperature Differential

A suitable temperature difference between the internal and external environments is one of the most important factors in a successful thermal imaging survey.

As a general guide, a minimum temperature difference of approximately 10°C between the inside and outside of a building provides a useful differential for identifying heat loss through the building envelope.

The greater the appropriate temperature differential, the easier it can be to identify variations in thermal performance.

Wind Speed

Wind can affect the temperature of external surfaces and cause heat to disperse from the building envelope. In most circumstances, it is preferable to conduct surveys when wind speeds are below approximately 10 mph.

Higher wind speeds can make thermal patterns more difficult to interpret and may reduce the reliability of certain observations.

Surface Properties and Emissivity

Different building materials emit infrared radiation differently. This property, known as emissivity, must be considered when carrying out and interpreting a thermal imaging survey.

For example, wall cladding, glass, painted surfaces and masonry can all have different thermal and reflective characteristics. An experienced thermographer will consider these differences and adjust camera settings and measurement techniques accordingly.

Seasonal Timing

Winter is generally the preferred season for many building thermography surveys, particularly when the objective is to identify heat loss, insulation defects and thermal bridging.

The larger temperature difference between a building’s interior and exterior in colder weather can provide greater thermal contrast, making anomalies easier to detect.

Improve Speed and Efficiency with Infrared Surveys

Traditional inspection techniques can be effective, but they can also be time-consuming, particularly when defects are concealed behind surfaces or located in difficult-to-access areas such as roofs, high-level walls and building façades.

Thermal imaging provides a fast, non-invasive way to survey large areas. A thermographer can quickly scan large sections of a building and identify potential areas of concern without physically accessing every surface.

This provides near-immediate visual feedback and helps focus further investigation where it is most needed. The speed of thermal imaging can be particularly valuable when assessing buildings where time is critical, such as during emergency investigations or when diagnosing unexpected building performance problems.

Improve Health and Safety with Thermographic Inspections

Traditional inspection methods can sometimes require scaffolding, access platforms or large motorised access equipment to reach high-level areas.

Thermal imaging can reduce the need for this type of access in many situations, allowing thermographers to assess large areas from a safe position on the ground or from another accessible location.

Reducing the requirement for work at height can help minimise associated risks and improve the overall efficiency of an investigation. As we explain in our article on how thermal imaging surveys can improve health and safety, infrared inspections can be a valuable tool for identifying problems while reducing the need for potentially hazardous access arrangements.

The Importance of Experience and Equipment

While environmental conditions are extremely important, the thermographer’s experience and expertise also play a major role in delivering meaningful results.

Highly experienced personnel, appropriate survey techniques, and high-sensitivity thermal imaging equipment can reduce some environmental limitations.

At APT Sound Testing, our thermographers are Level 3 trained, providing the expertise required to undertake detailed thermographic investigations.

We use high-resolution FLIR 480 × 640 thermal imaging cameras, combined with our latest in-house trend analysis software. This lets us efficiently analyse thermal data and produce clear, detailed reports after each infrared survey.

Experienced Level 3 thermographers, high-resolution equipment, and appropriate environmental conditions enable us to provide reliable thermal imaging data that helps clients make informed decisions about their buildings.

Arrange a Thermal Imaging Survey

If you require an infrared thermal imaging survey in London, the Home Counties or the South of England, APT Sound Testing can help.

For more information about our thermal imaging survey service, please contact us on 07775 623464 or email info@aptsoundtesting.co.uk.

The post Environmental Conditions for Thermal Imaging appeared first on SoundTesting Services UK.

In areas with moderate climates, heat pumps can provide a more environmentally friendly alternative to traditional heating and cooling systems such as gas boilers and conventional air conditioning.

An air source heat pump extracts heat from the outside air and transfers it into your home. You can use the heat generated for radiators, hot water, underfloor heating, and warm air systems.

Many air source heat pumps can also provide cooling during the summer months, making them a versatile solution for year-round temperature control. However, depending on the location and installation, you may need a heat pump noise survey to meet local planning or environmental noise requirements.

Are air source heat pumps environmentally friendly?

Air source heat pumps are generally considered a lower-carbon alternative to conventional fossil-fuel heating systems. Rather than generating heat by burning gas or another fuel, they extract naturally occurring heat from the air.

The system does, however, require electricity to operate. The environmental impact therefore depends partly on the electricity used to power the heat pump, as well as the system’s efficiency.

For homeowners looking to install an air source heat pump, environmental performance is only one consideration. Noise is another important factor, particularly where the outdoor unit is located close to neighbouring properties.

How much noise do air source heat pumps produce?

While air source heat pumps offer significant energy and environmental benefits, noise can still matter.

Depending on the model, operating conditions and installation, an air source heat pump can produce noise levels of up to around 60 dB(A). The actual noise experienced by nearby occupants will depend on factors such as the distance from the unit, surrounding buildings, background noise and how the equipment has been installed.

Where noise from equipment could affect neighbouring properties, an assessment may be required to determine whether the predicted or measured noise is likely to cause a disturbance.

For industrial or commercial noise sources affecting residential areas, noise is commonly assessed using British Standard BS 4142. The standard considers the difference between the noise’s rating level and the background sound level.

As a general indication, a difference of around +5 dB may be considered marginally significant, while a difference of around +10 dB can indicate a greater likelihood of adverse response. Site context and noise characteristics are also important when interpreting the results.

Why do air source heat pumps make noise?

An air source heat pump contains several mechanical and electrical components that can generate sound during operation.

The main components include:

• Compressor
• Condenser
• Expansion valve
• Evaporator
• Fan

Although several components contribute to the overall sound output, the compressor and fan are often the most noticeable noise sources.

What does an air source heat pump sound like?

Air source heat pumps can produce a range of sounds during normal operation. These can include:

• A constant low-level hum from the motor and compressor
• Fan noise as air moves through the system
• Vibrations from mechanical components
• Airflow noise through the heat exchanger
• Buzzing from electrical or mechanical components
• Additional sounds during defrost cycles

The character and intensity of the noise can vary depending on the operating conditions. For example, changes in pressure and airflow can affect the sound produced by the heat exchanger and fan.

Frost can also accumulate on the heat exchanger in cold conditions. During defrost cycles, the system may produce different sounds from those heard during normal operation.

For nearby residents, a continuous low-frequency hum can sometimes be more noticeable than a higher-level but intermittent sound. This is one reason assessing the noise characteristics, rather than simply the overall decibel level, matters.

How can air source heat pump noise be reduced?

If you are planning to install an air source heat pump, considering noise at the design stage can help prevent potential problems later.

An acoustic assessment can identify the likely impact of the proposed installation and help determine whether additional noise-control measures are required.

At APT Sound Testing, our air source heat pump acoustic package can include a noise assessment carried out in accordance with the relevant requirements of BS 4142, where applicable.

Where noise levels need to be reduced, acoustic recommendations may include measures such as:

• Optimising the position of the heat pump
• Increasing the separation distance from neighbouring properties
• Using suitable acoustic barriers or enclosures
• Installing absorptive acoustic panels
• Addressing vibration transmission
• Reviewing the specification and operating characteristics of the equipment

The most appropriate solution depends on the individual site, the equipment being installed, and the surrounding environment.

Do you need an air source heat pump noise survey?

If your proposed air source heat pump is located close to neighbouring properties or a noise-sensitive area, an acoustic assessment can help establish whether the installation is likely to meet relevant noise requirements.

A professional noise survey can provide useful information for planning applications, environmental assessments and the design of appropriate noise-control measures.

At APT Sound Testing, we can provide specialist acoustic advice and noise assessments for air source heat pump installations across the UK.

Contact us about an air source heat pump noise survey

If you need advice about sound testing or an air source heat pump noise assessment, get in touch with our team.

For more information, follow our blog or contact us at info@aptsoundtesting.co.uk or call APT Sound Testing directly on 01525 303905.

You can also find out more about our BS 4142 Noise Surveys and download our BS 4142 Noise Survey Checklist.

How can we help?

Why choose APT Sound Testing?

• We strive to get you a pass
• Competitive pricing
• Friendly and proactive service
• Experienced consultants
• UKAS & ISO accredited
• Fast response
• Rapid turnaround of results
• Nationwide coverage
• Single pre-completion solution

If you’re looking for an experienced acoustic consultant or noise engineer, our team can help with noise assessments, acoustic advice and sound testing.

The post Air Source Heat Pumps: Noise & Planning appeared first on SoundTesting Services UK.

APT provides specialist air tightness testing for data centres, including COLO suites, data halls, containment pods and Hot Aisle Containment (HAC) corridors.

Our testing helps data centre operators verify containment performance, minimise unwanted airflow, maintain stable rack inlet temperatures and optimise cooling efficiency. As a UKAS-accredited air testing laboratory, APT provides accurate testing, detailed analysis and clear reporting to support commissioning, compliance and ongoing operational performance.

Our specialist testing identifies leakage paths, measures containment performance and highlights areas where improvements may be required to achieve the intended airflow separation within mission-critical environments.

Why Air Leakage Testing Matters in Modern Data Centres

Effective airflow containment is essential to maintain efficient, reliable data centre cooling. Uncontrolled air leakage can allow conditioned and return air to mix, reducing cooling effectiveness and creating unnecessary load on CRAH and CRAC systems.

Air tightness testing can help operators achieve:

• Reduced cooling energy consumption
• More stable rack inlet temperatures
• Lower bypass airflow
• Improved CRAH/CRAC efficiency
• Better airflow separation
• Improved cooling performance for high-density IT environments

Poorly sealed COLO pods, containment systems or HAC corridors can contribute to thermal instability, hot spots and increased cooling demand.

APT’s specialist testing provides measurable evidence of containment performance and helps identify areas requiring remedial work.

What We Air Test in Data Centres

APT can test a range of containment and airflow-controlled areas, including:

• COLO containment zones
• HAC corridors
• Hot aisle containment systems
• Pod-based containment systems
• Return-air plenums
• Data hall containment enclosures

Our testing can assess both operational leakage performance and construction air tightness, giving operators and project teams a comprehensive understanding of how effectively the containment system is performing.

Key Airtightness & Leakage Measurements

3% Leakage Criterion – Performance Testing

APT can assess HAC and COLO containment leakage against the specified project performance criterion, including a 3% leakage target based on the design IT airflow, where tthe projecthas bdopted fthis criterion

This provides a practical measure of how effectively the containment system is separating supply and return airflow under controlled test conditions.

Always confirm the applicable leakage criterion against the project’s design specification, commissioning requirements, and relevant standards.

ATTMA Air Tightness Testing – Construction Quality

APT can also measure air leakage relative to the enclosure’s surface area. This assesses the physical airtightness and construction quality of the containment system.

Testing can help identify defects such as:

• Poorly sealed doors
• Gaps around containment panels
• Inadequately sealed joints
• Cable and service penetration leakage
• Floor and ceiling interface gaps
• Construction defects within the enclosure

Using both performance-based leakage measurements and air permeability testing gives project teams a more complete picture of containment quality.

High-Pressure Integrity Testing for COLO & HAC Enclosures

In addition to operational air leakage testing, APT can undertake high-pressure integrity testing of COLO pods and HAC corridors.

A higher-pressure test, typically around 75 Pa where specified, can expose weaknesses that may not appear during lower-pressure operational testing.

Potential issues can include:

• Panel deflection
• Door movement or bowing
• Seal failure
• Roof-panel movement
• Plenum interaction
• Weaknesses around interfaces and penetrations

High-pressure testing provides additional information about the enclosure’s behaviour and integrity under increased pressure conditions. This can be particularly useful when assessing containment systems during commissioning or investigating performance concerns.

Blower Door Smoke Air Leakage Surveys

APT also provides specialist blower door smoke leakage surveys for COLO suites and HAC corridors.

This diagnostic approach combines controlled pressure testing with smoke tracing to identify the location and direction of unwanted air movement visually.

Smoke surveys can reveal leakage paths that may be difficult to locate through airflow measurements alone, including:

• Leakage around containment doors and seals
• Gaps between panels and roof sections
• Cable tray and service penetrations
• Leakage at floor interfaces
• Plenum bypass routes
• Construction defects behind or around IT equipment

By pressurising the containment area and introducing controlled smoke, our engineers can trace air movement and identify specific leakage locations.

Photographic evidence can then help contractors undertake targeted remedial sealing.

This makes blower door smoke surveys particularly useful during:

• Data centre commissioning
• Pre-go-live inspections
• Defect investigations
• Remedial works
• Post-remediation validation

Our Data Centre Air Tightness Testing Process

APT’s testing process can include:

1. Initial assessment of the containment area and test requirements.
2. Test preparation, including identifying and temporarily sealing relevant openings where required.
3. Blower door installation and controlled pressurisation of the test enclosure.
4. ATTMA flow-curve analysis and leakage measurement.
5. Operational pressure testing, including testing at 7.5 Pa where specified.
6. Higher-pressure integrity testing, where required by the project.
7. Smoke-tracing diagnostics to identify individual leakage paths.
8. Leakage identification and photographic documentation.
9. Clear reporting against the agreed project criteria.
10. Practical recommendations for remedial sealing and retesting.

This gives project teams clear, actionable information on the airtightness and containment performance of their data centre environment.

Benefits of Air Testing COLOs & HAC Corridors

Specialist air tightness testing can help data centre operators and project teams achieve:

• Reduced cooling energy consumption
• Lower unwanted or bypass airflow
• Improved CRAH/CRAC performance
• More consistent rack inlet temperatures
• Better airflow separation
• Improved cooling performance for high-density loads
• Greater confidence during commissioning
• Identification of construction defects before handover
• Verification of remedial works
• Improved long-term containment performance

For mission-critical facilities, early leak detection can prevent avoidable cooling inefficiencies and increase confidence that the installed containment system is performing as intended.

Why Choose APT for Data Centre Air Testing?

APT specialises in air tightness testing for data centres, combining air testing expertise with an understanding of containment systems and the airflow requirements of mission-critical environments.

We provide:

• Accurate leakage measurements
• Detailed and easy-to-understand reports
• Specialist diagnostic testing
• Smoke leakage surveys
• High-pressure integrity testing
• Practical, contractor-friendly recommendations
• Post-remediation verification
• UK-wide testing coverage

Our services support data centre operators, COLO providers, M&E consultants, commissioning teams, main contractors and mission-critical facility managers.

APT provides testing across the UK, including major data centre locations such as London, Manchester, Poole, Dorset and other UK data centre hubs.

Get a Quote for COLO & HAC Air Tightness Testing

APT Sound Testing provides specialist airtightness testing for COLO suites, HAC corridors, and data centre containment systems across the UK.

Whether you require testing during construction, commissioning, pre-go-live checks, or after remedial works, our team can provide accurate measurements, diagnostic investigation, and clear reporting.

For more information or to discuss your data centre testing requirements:

Email: info@airpressuretesting.net
Telephone: 01525 303905

Contact APT today to discuss your COLO or HAC air tightness testing requirements and arrange a quotation.

The post Air Tightness Testing for Data Centres appeared first on SoundTesting Services UK.

One question clients regularly ask is: “What types of sound insulation testing are needed for flats?”

If you’re building a new block of flats or converting an existing property into separate dwellings, sound insulation testing is an important part of the Building Regulations process.

Under Approved Document E (ADE), separating walls and floors need to provide a suitable level of protection against noise travelling between homes. This includes everyday sounds such as conversations, television, music and footsteps.

The exact testing requirements depend on whether you’re dealing with a new-build development or a conversion. Still, two main types of sound insulation testing apply: airborne sound testing and impact sound testing.

Airborne Sound Insulation Testing

Airborne sound testing looks at how effectively a wall or floor stops sound travelling through the air.

Typical examples include speech, television, music and general household noise.

Where are airborne sound tests required?

Testing may be required between:

• Living rooms in neighbouring flats
• Bedrooms in neighbouring flats
• Living rooms and bedrooms
• Separating floors between flats

Airborne testing applies to both new-build flats and conversion projects.

How does an airborne sound test work?

During the test, a high-powered dodecahedron loudspeaker generates pink noise in one room. Class 1 sound meters then measure the sound levels in both the source room and the receiving room.

The results are used to calculate the airborne sound insulation performance, expressed as DnT,w + Ctr.

Minimum performance requirements

For residential developments, the typical minimum requirements are:

• New-build flats: ≥ 45 dB
• Conversions: ≥ 43 dB

These figures are an important part of demonstrating compliance with Approved Document E.

For a more detailed explanation, see our guide to Airborne Sound Testing.

Impact Sound Insulation Testing

Impact testing is slightly different. Rather than measuring sound travelling through the air, it measures noise created by physical impact on a separating floor.

Think about footsteps from the flat above, a chair being moved, or an object being dropped on the floor.

Where are impact tests required?

Impact testing is required for separating floors between dwellings, including conversions where a new flat is created above or below another dwelling.

How does impact testing work?

A calibrated tapping machine is placed on the upper-flat floor. The machine repeatedly drops a series of metal hammers onto the floor in a controlled pattern.

A Class 1 sound meter measures the resulting noise level in the room below.

The lower the measured result, the better the floor controls impact noise.

Minimum performance requirements

Typical limits are:

• New-build flats: ≤ 62 dB
• Conversions: ≤ 64 dB

If you’re dealing with an existing or upgraded floor, it’s particularly important to consider the floor construction and acoustic build-up before work starts.

For more information, see our guide to Sound Testing Floors in Flats.

Sound Testing Requirements for New-Build Flats

For a typical new-build flat development, you will generally need to consider:

• Airborne testing of separating walls
• Airborne testing of separating floors
• Impact testing of separating floors

The number of tests required depends on the size and layout of the development, as well as the different types of separating construction being used.

For example, a small block may typically require something along the lines of:

• 2 airborne wall tests
• 2 airborne floor tests
• 2 impact floor tests

However, confirm the exact testing schedule for each project rather than relying on a standard number of tests.

What about Robust Details?

If a development is constructed in accordance with an applicable Robust Details specification, sound testing may not be required for those particular separating elements.

However, you must follow the relevant Robust Details specification correctly, including the required registration and construction details. If the construction differs from the specification, testing may still be required.

Sound Testing Requirements for Conversion Flats

Conversions can be more challenging from an acoustic perspective.

Older buildings were not necessarily designed with the same levels of sound insulation expected between modern dwellings. Existing floors and walls can therefore perform very differently from one property to another.

For conversion projects, the required testing can include:

• Airborne wall testing
• Airborne floor testing
• Impact floor testing

Why test before construction?

For conversions, we often recommend pre-construction sound testing where appropriate.

Testing the existing structure before carrying out acoustic upgrades can help establish how well the existing floor or wall performs. You can then use this information to determine what improvements are likely needed.

It can be much more cost-effective to identify an acoustic problem before installing the new floor or ceiling than to discover it during the final compliance test.

For further guidance, see our article on Designing for Sound Insulation.

Pre-Construction and Post-Construction Sound Testing

Sound insulation testing can be useful at different stages of a project.

Pre-construction testing

Pre-construction testing is particularly useful on conversion projects.

It allows you to assess the existing construction before acoustic upgrade work begins. The results can then help inform the design of the proposed floor or wall build-up.

Post-construction testing

Post-construction, or pre-completion testing, is carried out once the relevant construction work has been completed.

These tests provide the results needed to demonstrate compliance with Building Control where testing is required.

For a more detailed explanation of the process, see our guide to Pre- and Post-Construction Sound Insulation Testing Methodology.

Sound Testing for Lease Conditions and Hard Flooring

Building Regulations aren’t the only reason you may need sound testing in a flat.

Some lease agreements, particularly in London, include acoustic requirements for flooring alterations. This is especially common when replacing carpet with timber, laminate or engineered wood flooring.

In these situations, an acoustic assessment or sound testing may be required before and/or after the flooring is installed.

Depending on the lease and the requirements of the building, this could involve:

• Pre-installation airborne and impact testing
• Acoustic assessment and design advice
• Installation of an appropriate acoustic floor system
• Post-installation verification testing

Check the lease requirements before starting work. Getting the acoustic requirements right at the design stage can help avoid problems later.

For more information, see our guide to Sound Testing and Acoustic Design for Lease Conditions.

Why Choose APT Sound Testing?

At APT Sound Testing, we work with developers, builders, architects, landlords and property professionals across London and the South East.

Our services include:

• UKAS-accredited testing laboratory status
• ATTMA Level 2 certification
• More than 22 years of experience in acoustics and sound insulation testing
• Specialist experience with London and South East developments
• Fast site attendance, often within 24–48 hours
• Same-day certification
• In-house sound testing engineers rather than subcontractors
• Additional services including air testing, thermal imaging and diagnostic smoke surveys

Because our engineers test a wide range of residential projects, we can often identify potential problems quickly and provide practical advice on what may need to be addressed.

The aim is simple: help you get the testing right and avoid unnecessary project delays.

Need Sound Insulation Testing for a Flat?

Whether you’re developing a new block of flats, converting an existing property or carrying out alterations to a leasehold flat, getting the acoustic requirements right early can save time and money.

If you need sound insulation testing in London or the South East, or you’d like advice about acoustic design and compliance, get in touch with APT Sound Testing.

Email: info@aptsoundtesting.co.uk
Phone: 07775 623464
Website: www.aptsoundtesting.co.uk

We can often attend sites within 24–48 hours, with certificates available the same day where appropriate.

The post Types of Sound Insulation Testing Needed on Flats appeared first on SoundTesting Services UK.

Replacing carpet with wooden, laminate or engineered timber flooring is a popular home improvement project in apartment buildings and flats. However, switching from a soft floor covering to a hard floor finish can significantly affect a property’s acoustic performance.

Many apartment leases include specific requirements for replacement flooring, often requiring the new floor construction to provide acoustic performance that is equivalent to, or no worse than, the original carpeted floor. Failing to meet these requirements can result in neighbour complaints, disputes with freeholders or managing agents, breaches of lease conditions and potentially expensive remedial works.

At APT Sound Testing, we help leaseholders, property managers, freeholders and flooring contractors manage the acoustic requirements associated with carpet-to-wood flooring conversions.

Our approach can include pre-works sound testing, acoustic design reviews and post-installation sound testing, providing a clear process for assessing and verifying the acoustic performance of the replacement floor.

For further guidance, see our sound testing roadmap for leaseholders.

Why Does Acoustic Performance Matter When Replacing Carpet?

Carpet and underlay can provide a useful degree of impact sound absorption, helping to reduce the transmission of everyday noises such as footsteps, dropped objects and movement across the floor.

Replacing carpet with a hard floor finish can change how impact sound is generated and transmitted through the building. Without an appropriate acoustic floor system, noise transmission to the flat below may increase.

This is why many residential leases contain flooring clauses requiring leaseholders to demonstrate that a replacement floor will provide an appropriate level of acoustic performance.

Before installing a new floor, it is therefore important to understand how the existing floor performs and what acoustic performance the proposed replacement system needs to achieve.

Stage 1: Pre-Works Sound Testing

The first stage establishes the acoustic performance of the existing carpeted floor.

APT Sound Testing can undertake airborne and impact sound insulation testing in accordance with the relevant recognised UK testing standards. These measurements provide an objective assessment of the existing floor construction before any alterations.

You can then use the results as a baseline when assessing the proposed replacement flooring.

Benefits of pre-works testing include:

• Establishing the existing airborne sound insulation performance.
• Measuring impact sound transmission through the existing floor.
• Providing objective acoustic information for leaseholders, freeholders and managing agents.
• Helping reduce the potential for disputes following installation.
• Establishing an evidence-based performance benchmark for the replacement floor.

Testing before work begins is particularly valuable because it records the original floor’s performance before it is altered.

Stage 2: Acoustic Design Review for the Replacement Floor

Once the existing floor has been tested, the proposed flooring construction can be reviewed against the property’s and lease’s acoustic requirements.

Depending on the project, this may involve considering:

• Acoustic underlays.
• Floating floor systems.
• Engineered timber flooring.
• Laminate flooring systems.
• Resilient acoustic mats.
• Isolation layers.
• Existing structural floor constructions.
• Floor finishes and installation methods.

The objective is to identify a floor build-up that provides the required acoustic performance.

The acoustic performance of a flooring system can depend on more than the flooring product itself. The type of structural floor, acoustic layer, installation method and interaction between the different components can all be relevant.

An acoustic review before installation can therefore help identify potential issues at the design stage, when changes are generally easier and less expensive to make.

For further information about changing from carpet to a hard floor finish, see this guide to changing from carpet to a wood floor in flats.

Stage 3: Post-Installation Sound Testing

Once the new flooring has been installed, post-installation sound testing can be undertaken to assess the acoustic performance of the completed floor construction.

The testing can be carried out using the same general assessment methodology as the pre-works testing, allowing you to compare the results with the baseline measurements.

The final test report provides independent acoustic evidence of the completed floor’s performance.

Where testing is required as part of a lease condition or approval process, the report can also provide useful documentation for leaseholders, freeholders, managing agents and other parties involved in the project.

Why Test Before and After a Flooring Upgrade?

Testing before and after installation provides a more complete picture of the floor’s acoustic performance.

The pre-works test establishes the starting point, while the post-installation test assesses the completed floor.

This approach can help:

• Identify the acoustic performance of the original floor.
• Establish an objective benchmark.
• Inform the selection of an appropriate flooring system.
• Verify the performance of the completed installation.
• Provide independent documentation for relevant parties.
• Reduce uncertainty around acoustic compliance.

For leaseholders undertaking significant flooring alterations, obtaining objective acoustic evidence can be an important part of managing the project.

Sound Testing for Leaseholders Across London and the South East

APT Sound Testing has carried out floor replacement acoustic assessments for residential properties across London and the South East.

We work with a range of clients, including:

• Leaseholders and apartment owners.
• Property management companies.
• Freeholders.
• Resident management companies.
• Flooring contractors.
• Interior designers.
• Architects.
• Surveyors.

Our experience with residential flooring projects lets us provide practical acoustic advice alongside testing, helping clients understand the acoustic implications of switching from carpet to a hard floor finish.

UKAS-Accredited Sound Insulation Testing

APT Sound Testing is a UKAS-accredited testing laboratory operating to ISO/IEC 17025 for relevant testing activities.

UKAS accreditation provides independent recognition of the laboratory’s competence and the quality systems supporting its testing activities.

Our acoustic measurements are undertaken using appropriate calibrated equipment and established testing procedures by experienced acoustic professionals.

For projects that require independent, formally documented acoustic testing, using an appropriately accredited testing laboratory can provide additional confidence in the test results.

Planning to Replace Carpet with Wooden Flooring?

If you are planning to replace carpet with wooden, laminate, or engineered timber flooring in an apartment building, it is worth considering the acoustic requirements before removing the existing floor.

APT Sound Testing can provide a complete acoustic assessment service, including:

• Pre-works sound testing
• Acoustic design review
• Review of proposed floor constructions
• Acoustic advice on flooring systems
• Post-installation verification testing
• Acoustic reporting

Assessing the existing floor before work begins and testing the completed installation can provide a clear evidence trail throughout the flooring upgrade.

This can be particularly useful where the lease requires the replacement floor to maintain an appropriate level of acoustic performance.

Request a Quote for Leaseholder Sound Testing

Whether you are refurbishing a single apartment or managing flooring works across a larger residential development, APT Sound Testing can provide acoustic testing and advice tailored to your project.

Contact APT Sound Testing for a quotation and expert guidance on sound testing for carpet-to-wood flooring conversions.

Call: 07775 623464
Email: info@aptsoundtesting.co.uk
Website: www.aptsoundtesting.co.uk

Planning a carpet-to-wood flooring conversion? Contact APT Sound Testing before the work begins to discuss your acoustic testing requirements.

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The accuracy of a BS8233 Noise Impact Assessment, also known as a BS8233 noise survey, depends heavily on how well you prepare the site before monitoring begins.

BS8233:2014 requires noise measurements to reflect the existing noise environment. This means the site must be in suitable condition for reliable, meaningful measurements.

Whether you are preparing for a planning application, discharging a planning condition, or assessing a proposed residential development, a little preparation can help the survey run smoothly and produce accurate results.

Below is a practical guide to preparing your site for a BS8233 noise assessment.

1. Ensure Safe and Unrestricted Access to the Monitoring Location

Position noise monitoring equipment in a secure, representative location. Before the survey begins, make sure the agreed monitoring position is easy to access.

You should:

• Provide clear access to the agreed monitoring location.
• Remove stored materials, vehicles or temporary structures that could obstruct the equipment.
• Ensure the area is safe, dry and free from potential hazards.
• Avoid locations where equipment could be accidentally damaged, moved or tampered with.

Provide suitable access so the acoustic consultant can position the microphone correctly and capture representative baseline noise levels.

2. Maintain Normal Site Conditions

For the results to be representative, the survey should reflect the site’s normal environmental conditions.

Where possible:

• Do not change normal site operations unless specifically instructed by the acoustic consultant.
• Avoid introducing temporary noise sources such as generators, radios or additional plant.
• Ensure unusual activities are not taking place during the monitoring period.

The objective is to measure the typical ambient noise climate, not conditions that are unusually quiet or noisy.

3. Avoid Short-Term or Artificial Noise Sources

Temporary noise sources can affect the results and may make the recorded data less representative of typical conditions.

Before monitoring begins:

• Switch off temporary plant or equipment that is not normally in use.
• Avoid scheduling deliveries or construction activities during equipment installation where possible.
• Keep windows and doors in their usual positions rather than changing them specifically for the survey.
• Inform contractors and site staff that noise monitoring is taking place.

This helps ensure that the survey data provides a realistic indication of the existing noise environment relevant to the proposed development.

4. Confirm Power Availability Where Required

Many BS8233 noise surveys use autonomous Class 1 sound level meters that can operate independently for extended periods. However, some monitoring arrangements may require a mains electricity supply.

If mains power is required, ensure that:

• A stable 240V supply is available.
• There is a safe and suitable indoor location for any powered equipment.
• The equipment does not need to rely on a generator, as generators can introduce additional noise and potential power fluctuations.

Your acoustic consultant should confirm any power requirements before the survey date.

5. Provide Accurate Site Information

Good information before the survey allows the acoustic consultant to plan the assessment effectively and select appropriate monitoring locations.

Where available, provide:

• Site layout plans.
• Proposed development drawings.
• Operating hours for commercial premises.
• Details of known noise sources, such as industrial premises, public houses, commercial premises or busy roads.
• Site access instructions.
• Contact details for the person responsible for providing access.

The more accurate the information provided, the easier it is to identify potential noise sources and determine appropriate monitoring positions and durations.

6. Keep the Monitoring Equipment Secure

If equipment is left on site for 24 hours or longer, it must remain undisturbed throughout the monitoring period.

To help protect the equipment:

• Ensure the monitoring location is secure.
• Notify relevant staff, tenants or site personnel that monitoring equipment has been installed.
• Do not move, switch off or interfere with the equipment.
• Keep vehicles, materials and other objects away from the microphone.

Moving or interfering with monitoring equipment can affect the validity and reliability of the recorded data.

7. Inform Neighbours or Occupants Where Necessary

For residential and mixed-use developments, it may be useful to inform occupants or nearby residents that noise monitoring will take place.

You can:

• Let occupants know when you will install the equipment.
• Explain that the monitoring equipment is safe and designed to operate unobtrusively.
• Ask occupants not to move or interfere with the equipment.
• Explain that the purpose of the survey is to establish the existing noise environment.

Good communication can help prevent accidental interference and ensure the equipment remains undisturbed.

8. Consider Weather Conditions

Weather conditions can affect outdoor noise measurements, particularly during heavy rain or strong winds.

Before the survey:

• Avoid installing equipment during extreme weather where possible.
• Ensure the microphone has an appropriate windscreen fitted.
• Protect equipment from direct rainfall.
• Follow your acoustic consultant’s advice if weather conditions become unsuitable.

The acoustic consultant will assess weather conditions and determine whether the measurements remain suitable for use in the assessment.

9. Allow Sufficient Monitoring Time

The required monitoring period will depend on the development, site conditions and requirements of the assessment.

For many residential developments, monitoring may include:

• 24-hour noise monitoring to establish daytime and night-time noise levels.
• Longer monitoring periods where site conditions or planning requirements make this appropriate.
• Additional night-time measurements where required by the local authority or Environmental Health.

The site must remain accessible, and the monitoring equipment must remain undisturbed for the full agreed monitoring period.

BS8233 Noise Survey Preparation Checklist

Proper site preparation helps ensure the acoustic consultant obtains accurate, representative results.

Before the survey, make sure you have:

• Provided safe and unrestricted access to the monitoring location.
• Maintained normal site conditions.
• Removed or avoided temporary noise sources where appropriate.
• Confirmed power availability if required.
• Supplied relevant drawings and site information.
• Kept the monitoring equipment secure.
• Informed occupants or site staff where necessary.
• Maintained typical environmental conditions.
• Considered weather conditions.
• Allowed sufficient time for the agreed monitoring period.

Good preparation helps the acoustic consultant obtain reliable data to assess the site’s existing noise environment in accordance with BS8233:2014.

Need a BS8233 Noise Impact Assessment?

If you need a BS8233 Noise Impact Assessment, our UKAS-accredited acoustic consultants can help.

With more than 25 years of industry experience, we provide BS8233 noise surveys across London and the South East for residential developments, planning applications and noise-related planning conditions.

Whether you are submitting a planning application, discharging a noise condition or assessing a proposed development, we can provide professional noise monitoring and clear, practical reports designed to meet local authority requirements.

Email: info@aptsoundtesting.co.uk
Call APT Sound Testing: 01525 303905

You can also download our BS8233 Noise Assessment Checklist to help prepare your site before monitoring begins.

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At APT Sound Testing, we have been providing professional BREEAM thermal imaging surveys for more than 10 years. Our experienced team uses high-resolution thermal imaging equipment to identify issues with insulation continuity, thermal bridging and heat loss, helping clients meet BREEAM requirements and improve building performance.

All of our thermal imaging surveys are carried out by Level 2 certified thermographers, providing clients with a professional and reliable assessment of their building.

What Is a BREEAM Thermal Imaging Survey?

Thermographic surveys are an important part of the BREEAM assessment process. BREEAM (Building Research Establishment Environmental Assessment Method) is one of the world’s leading methods for assessing the sustainability and environmental performance of buildings.

BREEAM sets standards for sustainable building design, construction and operation. Both BREEAM New Construction and BREEAM Domestic Refurbishment recognise the value of suitable thermographic surveys carried out by a suitably qualified Level 2 thermographer.

A thermal imaging survey uses specialist infrared cameras to detect temperature variations across the building envelope. These temperature differences can highlight areas where insulation may be missing, poorly installed or discontinuous, as well as potential thermal bridging and other defects.

What Can Thermal Imaging Surveys Identify?

A professional thermographic inspection can be used for a wide range of applications, including:

• Insulation continuity checks
• Thermal bridging
• Areas of heat loss
• Paths of air leakage
• Building envelope defects
• Underfloor heating inspections
• Flat roof condition surveys
• Data centre thermal surveys
• Electrical and mechanical installation inspections
• General building performance investigations

We provide thermal imaging surveys for both commercial and domestic properties, with the scope of each inspection tailored to the requirements of the project.

Non-Invasive and Non-Destructive Testing

One of the key benefits of thermal imaging is that it is a completely non-invasive and non-destructive inspection method. There is no need to open up walls, remove finishes or physically damage the building to investigate potential insulation defects.

Our high-resolution thermal imaging equipment allows our certified thermographers to identify temperature differences that may indicate areas requiring further investigation, providing valuable information without disrupting the building.

Experienced Level 2 Thermographers

Our team of certified professional engineers has extensive experience in thermal imaging, BREEAM assessments, construction, engineering, building maintenance and professional management.

We understand that every building and project is different. Our surveys are therefore planned around the specific requirements of your property, whether you need a BREEAM thermal survey for a new development, a refurbishment project or a wider building investigation.

We use professional, high-resolution thermal imaging equipment designed to provide detailed and accurate results. Following the inspection, we produce a comprehensive report and issue it electronically for convenient access.

Where project requirements allow, reports can normally be provided within 24 hours of completing the survey.

When Should a BREEAM Thermal Survey Be Carried Out?

A BREEAM thermographic inspection can generally be undertaken once the building envelope is complete and the heating system is operational. Suitable environmental and building conditions are important to ensure that the thermal survey can identify temperature differences effectively.

We can advise you on the requirements for your specific project and provide guidance on preparing the building ahead of the inspection.

A Complete Pre-Completion Testing Service

APT Sound Testing can provide more than just thermal imaging. We can also assist with a range of pre-completion and building performance testing requirements, including:

• Air tightness testing for Building Regulations Part L
• Sound insulation testing for Building Regulations
• Planning noise surveys in accordance with BS 8233 and BS 4142
• Server room integrity testing
• Thermal imaging surveys for BREEAM and building performance assessments

By combining multiple testing services, we can provide a convenient, coordinated solution for construction and refurbishment projects.

What Do We Need to Provide a Quotation?

Getting started is straightforward. To prepare a quotation, we typically require a few details about your project, including:

• The building location
• Floor plans
• Elevation drawings
• The type and size of the building
• The purpose and scope of the thermal survey

We can also provide an informative checklist to help you prepare your property and ensure the survey can be completed efficiently.

BREEAM Thermal Imaging Surveys Across London and the UK

Whether you require a BREEAM thermal imaging survey in London or elsewhere in the UK, APT Sound Testing can provide professional thermographic inspection services tailored to your project.

Our Level 2 certified thermographers have extensive experience across commercial, residential and construction projects. We focus on providing clear, accurate and useful reports that help identify potential issues and support the wider assessment and compliance process.

If you’re unsure whether a thermal imaging survey is required for your project, our team can discuss your requirements and advise you on the appropriate testing.

Arrange Your BREEAM Thermal Imaging Survey

If you require a professional BREEAM thermal imaging survey, contact APT Sound Testing today.

Call us on 01525 303905 or email info@aptsoundtesting.co.uk to discuss your project and request a quotation.

Our experienced team is ready to assist with your thermal imaging and pre-completion testing requirements from initial enquiry through to the completed report.

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APT Sound Testing provides air tightness testing across London and the United Kingdom. We undertake air testing on all types of projects from single dwelling to the largest commercial buildings and data centres. We are one of the few companies that are UKAS accredited to undertake both Air & Sound testing in compliance to Building Regulations and Standards. This means we can undertake Air, Sound and Vent Testing Packages during the same visit which provides our clients with cost savings and improved on site co-ordination. Unlike many companies we do not subcontract our works.

Also known as blower door testing, air tightness testing, is the process of measuring the amount of air leakage from a building through the building envelope. To try and help our clients better understand and prepare for their air tightness testing, we have tried to explain and answer our customer’s most common questions. For more information on our air tightness testing services you can also visit our Services Page.

What is Air Tightness Testing for Building Regulations?
Air testing is mandatory in the United Kingdom and is governed by Part L of the Building Regulations, this split into two parts; for domestic properties Part L1A should be used and for commercial properties Part L2A should be referenced.

Building Regulations Part L states air tightness testing should be carried to check the air leakage that occurs through a buildings envelope. The air leakage test checks the amount of air that escapes through gaps or air leakage paths through the building fabric. If the building is more air tight, less energy will be being needlessly lost, thus lowering the carbon emissions of the building. Air testing also shows how efficient a building is at retaining conditioned air which will also put less straight on your mechanical and ventilation system. Failing to maintain adequate air tightness can lead to up to 50% of heat loss from within a building to the outside atmosphere.

What air leakage target do I need to achieve?
Most new dwellings and commercial buildings need to achieve an air leakage of 3m3/hr/m2 to 5m3/hm2, this rate would usually be acceptable by building control and your SAP assessor as an acceptable result, although you need to check each your designed SAP assessment as there may be items within your buildings design that that may affect this figure.

How long does the air test take?
Most air tightness tests can be completed in 1-2 hours if they pass straight away; however, tests can take much longer if they initially fail. It usually speeds up the process if customs prepare their buildings in-line with our air tightness checklist as its means we can start the testing as soon as we arrive on site instead of waiting for the client to tape up areas, or make upgrades to the building envelope.

We also offer a smoke testing service to locate the air leakage paths within a building envelope which can also take extra time; however this often allows our clients to seal and pass their building at the first attempt even if their building initially fails the air test.

How do you undertake an air tightness test?
The air tightness test is undertaken in-line with Building Regulations Part L1 & L2 and ATTMA TS1 & TS2. Basically we measure the pressure differential across the envelope of the building by means of the temporarily installation of a large fan inside a door panel. Thereafter, a range of static pressures and environmental readings are taken.

The fan is switched on and the air pressure in the property is gradually increased or decreased and the differential pressure is recorded at each step, usually from 25 Pa to 70 Pa. The total air flow required to achieve a pressure differential of 50 Pa is calculated and divided by the total building envelope area to provide the leakage rate in m3/h.m2@50Pa.

How do I prepare my building for the air test?
The more complete you’re building the more chance you have of passing the air tightness test at the first attempt. We send our and air test checklist with every quotation to help our client prepare for the testing. It is our aim to help clients pass their air test at the first attempt.

Basically you prepare the building in-line with our checklists and the items below, you will generally have a much better chance of passing the testing at the first attempt.

1. The building envelope should be fully complete; this includes walls, floors and ceilings.
2. All doors and windows must be fully fitted and able to shut tightly against their seals.
3. All electric fittings must be installed and functional.
4. All mechanical fittings must be installed and functional.
5. Gaps within walls and floors must be sealed.
6. All service penetrations must be fully sealed through the building envelope.
7. Bathrooms and kitchens must be fully fitted and all service penetrations sealed.
8. All mechanical ventilation turned off with grilles sealed.
9. All trickle vents to windows and doors must be sealed.
10. All fireplaces must be sealed.
11. Ensure water is present in soil pipes.
12. 240v power must be available on site.

If you need an airtightness test, please call us on 01525 303905 or email info@aptsoundtesting.co.uk for a no-obligation quote. If you need more information on how to prepare your building for the air test,, please download our airtightness testing checklist. Alternatively, please visit our website at www.aptsoundtesting.co.uk for more information on our pre-completion testing services.

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Airborne and Impact Sound is transmitted through most walls and floors by setting the entire structure into vibration. This vibration generates new sound waves of reduced intensity on the other side. The passage of sound into one room of a building from a source located in another room or outside the building is termed ”sound transmission”. 

Sound transmission loss or Sound Reduction Index, R dB, is a measure of the effectiveness of a wall, floor, door or other barrier in restricting the passage of sound. The sound transmission loss varies with frequency and the loss is usually greater at higher frequencies. The unit of measure of sound transmission loss is the decibel (dB). The higher the transmission loss of a wall, the better it functions as a barrier to the passage of unwanted noise across the dividing (acoustic) partitions.

Approved Document E stipulates that there are two types of sound insulation in buildings: airborne and impact. Airborne sound insulation is used when sound produced directly into the air is insulated and it is determined by using the sound reduction index. Impact sound insulation is used for floating floors and it is determined by the sound pressure level in the adjacent room below.

A sound insulation test of a separating partition will be considered as a pass if the airborne sound insulation is equal to or greater than the DnT,w + Ctr value shown for the appropriate dwelling in the table, for airborne testing in new builds properties a figure of 45dB or greater is required and for Impact testing 62dB and below. For conversion properties a figure of 43dB or greater is required and for Impact testing 64dB and below.

What is DnT,w

DnT,w is an in-situ measured performance parameter which demonstrates the level of resistance to sound transmission between two adjacent spaces, such as flats or houses. The measurement will include both direct sound transmission and flanking sound transmission of the construction. Flanking transmission is the effect of sound travelling through the building and may be particularly evident where beams and joists bridge a common partition or along poorly isolated lightweight wall constructions.

The DnT,w of a separating wall or floor will typically be of the order 5 to 7 dB lower than the manufacturers specified Rw (single figure quantity of sound insulation) for the single element, due principally to the contribution from flanking sound transmission around the element when it is built on site – this should always be accounted for in the initial acoustic design.

What is Ctr

Ctr is the spectrum adaption term. It is a correction attributed to the sound insulation quantity to account for urban traffic noise.

What is L’nT,w

L’nT,w is an in-situ measured performance parameter which demonstrates the level of resistance to impact sound transmission between floors. The impact measurement includes both direct sound transmission and flanking sound transmission.

Weighted Sound Reduction Index Rw

When specifying the acoustic performance of an acoustic partition in a more general manner, it can be useful to describe the sound insulation by a single number. The weighted sound reduction index, Rw , is a rating method given in EN ISO 717-1. This standard fits a standard reference curve to the measured sound reduction index curve.

Within the EN ISO 717-1 standard, a rating method is also given where the Rw value is completed by two C-terms which are applied to two models of the noise spectra for various types of noise. These two terms, Rw + C and Rw + Ctr, also include the frequency range 100 – 3150 Hz but can be extended to 50 – 5000 Hz. As industrial and traffic noise often have high sound levels which are also below 100 Hz, it is recommended that the extended frequency area is used.

The summary value, Rw + C, gives the reduction value in dBA for a spectrum with a level which is equally high in all third-octave bands. This can be used for:

•             Highway road traffic travelling at speeds in excess of 80 km/h

•             Factories emitting mainly medium and high frequency noise

•             Living activities (talking, music, radio, TV)

•             Railway traffic at medium and high speed

•             Jet aircraft at a short distance

The summary value Rw + Ctr also gives the reduction value in dBA, spectrum with low-frequency dominance such as:

•             Disco music

•             Urban road traffic

•             Railway traffic at low speeds

•             Factories emitting mainly low and medium frequency noise

Both the impact and airborne insulation performance of floors and walls should be carefully considered from the start of the project to ensure that the minimum performance requirements for new and converted developments are met inline with Approved Document E

If you would like more information in regards to our sound testing and/or noise survey services, please contact us now at info@aptsoundtesting.co.uk.

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