Month: April 2020

Detection of Air Leaks Using Thermal Imaging

Detection of Air Leaks Using Thermal Imaging

Detection of Air Leaks Using Thermal Imaging and Air Tightness Testing

Air leaks through building envelopes lead to higher energy consumption and often places extra strain on the heating and ventilation systems. Air leaks can also lead to condensation which can cause a poor indoor climate for the occupiers of the building.

To detect air leaks through the building envelope using a thermal imaging camera a temperature difference and a pressure difference is needed. With a thermal imaging camera you detect the characteristic patterns that occur when cold air is coming through a leak in the building construction which runs along a surface and cools the surface down.

A thermal imaging inspection should always be undertaken on the side of the construction with negative pressure. Air leaks are often detected with the help of the air tightness pressurisation method often referred to as an air tightness test. When air tightness testing and thermal imaging survey inspections are used together they make a powerful combination for building fault diagnosis.

Detection of Air Leaks Using Thermal Imaging

Set up an air tightness test and thermal imaging inspection

Small cracks and crevices can cause internal draft in the building. This is not only annoying for the occupants; it can also cause severe energy loss and higher ongoing costs. Building Air leakage can account for up to half of the energy consumed for heating purposes. By undertaking an air tightness test you can easily make the smallest cracks visible.

Using a Blower Door to help pressurise the building helps exaggerate air leaking through defects within the building shell which can easily be picked up during the thermal imaging inspection.

Our Blower Door systems include the following three components:

  1. A calibrated Retrotec door fan
  2. A compatible expandable a door panel system
  3. A Retrotec pressure gauge to measure fan flow and building pressure.

Our Blower Door fan is temporarily sealed into an exterior doorway using the corresponding door panel system. The fan is used to blow air into or out of the building, which creates a small pressure difference between inside and outside the building under test.  Using our air tightness fan system we can either suck air out of the building or blow air into it, causing a pressure difference. In situations where the outside air is colder – which is often the case in the UK – the most common method is to suck air out of the building using the depressurisation method.  

BREEAM Thermal Imaging Survey

During the air tightness test we aim to attain a pressure difference of 50 Pascal between the inside of the building and outside air pressure. Due to this pressure difference the outside air will rush into the building through the cracks that are present in the building envelope (floor, walls and/or ceiling). The outside air will quickly cool down the location where an air leakage crack is present. This temperature difference will clearly show up in the thermal image as a cold spot or cold area, allowing our Thermal Imaging Engineer  to accurately locate and map the air infiltration pathway within an easy to follow report.

We have extensive experience in conducting commercial building air tightness and thermal imaging surveys across the following types of buildings/businesses:

  • Warehouses
  • Factories
  • Office Blocks
  • Blocks of Flats
  • Universities
  • Schools
  • Hospitals
  • Railway Stations

If you require a BREEAM Thermal survey our professional and certified Level 2 Thermographer’s will carry out your thermographic Inspections for BREEAM compliance in accordance with all necessary standards and current regulations, all we need are a few details such as floor plans and elevation drawings and the building location to provide a quotation. We will also send across our informative Thermal Survey Checklist to help you prepare for the thermographic Inspection.

Contact APT Sound Testing for a free quotation for a thermographic inspection. All we need are a few details such an elevation drawings, floor plans and location to provide a quotation.

If you would like more information about the detection of air leaks using thermal imaging or BREEAM Thermographic Inspection Surveys, please contact us now at or call us today on: 07775 623464.

Thermal Imaging London

Thermal Imaging London

Thermal Imaging London Deal
If you require a thermal imaging survey carried out in London we are currently offering a 10% Discount, please contact us and quote “London Thermal Imaging Deal” to get your discount.

Thermal Imaging or thermographic building surveys is a non-invasive temperature measurement testing method.  Thermographic inspections can provide a no-contact survey for many applications in detecting missing insulation in building envelopes and mechanical and electrical faults before they actually give rise to unplanned and costly breakdowns.

BREEAM thermal image of a building shown in 3D

Thermal Imaging London
Whether it is for insulation continuity in Building Regulations Part L2, paths of air leakage, insulation we have a survey to fit your requirements. Our integrity is guaranteed to bring you true results.

Common problems that Thermal imaging in buildings can help to identify are:

> Missing, damaged, or inadequate insulation,
> Building envelope air leaks and moisture intrusion
> Destructive water damage

Upon completion of our thermal imaging survey you will receive a report that details the following:

> High specification 640×480 cameras with a wide-angle lens
Same Day’ delivered reports
> Dedicated scheduling and expert campaign management ensuring all data is returned correctly and quickly
> Recommendations for any further investigation required along with an explanation

The Advantages of Thermal Imaging

Unlike other types of tests, thermal imaging is a non-invasive procedure which requires little physical work. Some of the images can be taken from outside the property. This also means there is no risk of damage to the building, and it can help speed up the process of identifying any problem areas, potentially saving clients time and money.

Thermography is suitable for use on all sorts of new buildings as well as old existing buildings that may suffer from draughts or air tightness issues, to new-builds which have to meet the latest building regulations. It can be used on domestic properties, business premises and all types of public buildings as well.

Thermal Inspections for BREEAM

What are BREEAM thermal inspections? BREEAM is the Building Research Establishment Environmental Assessment Method and is the world’s longest-established system for assessing, rating, and certifying the sustainability of buildings.

We can offer a bespoke BREEAM thermal imaging survey which will fit you or employers requirements. BREEAM, who award credits for surveys carried out by suitably qualified thermographer’s – APT Sound Testing’s thermographic engineers are trained to a minimum of level 2. It is also worth noting that thermal surveys can also help you meet the insulation requirements of Building Regulations Part L2 (b).

APT Sound Testing aims to offer you the best thermal imaging service at local prices. We are currently offering a 10 percent discount on all our thermal imaging inspections, thermal imaging surveys.

For more information, please contact us now at or phone Darren direct on 07775 623464. Alternatively please visit our website.

What is a Thermographic Survey Inspection?

What is a Thermographic Survey Inspection?

What is a Thermographic Survey Inspection?
Thermographic survey inspections – which are also known as thermography surveys, can help to determine the thermal performance of a building. It creates a detailed photographic report for the customer (taken on a thermal imaging camera) which shows the temperature of commercial buildings.

APT Sound Testing undertakes detailed Thermographic Surveys to identify heat loss in order to improve energy efficiency and increase thermal comfort within our client’s buildings.

Using thermal imaging cameras, our highly skilled Level 2 engineers can detect infrared radiation and therefore identify increases or decreases in temperature. APT have been working with contractors and consultants to ensure their buildings do not suffer from excessive cold bridging, air leakage or thermal breaks in insulation.

What is a Thermal inspection Surveys?
BREEAM recognise the benefit of a thermographic survey by awarding credits if a thermal imaging survey is undertaken on a project. The survey will also demonstrate compliance with the construction specification on newly constructed buildings in-line with Building Regulations Part L and BREEAM.

What problems can a Thermal inspection survey identify?
The BREEAM thermal survey can diagnose problems within the building fabric such as missing insulations, moisture ingress, condensation and mould growth. The use of thermography can provide excellent visual and quantitative evidence of the causes of the suspected problems.

What is the science behind a thermal imaging survey?
Infrared thermography is a type of photography which is based on infrared wavelengths, rather than visible wavelengths.

Thermal imaging relies on radiated energy in the infrared (IR) spectrum which cannot be seen by our eyes.

Do you need to be trained to carry out a thermal survey?

Yes, to carry out a BREEAM thermal inspection you need to be certified to at least Level 2. Our BREEAM thermal imaging engineers are trained to Levels 2 & 3, so are suitably qualified to carry out thermal surveys.

How do I prepare my building for a thermal imaging survey?
In order to correctly carry out this thermographic assessment, it is necessary to achieve a 10ºC differential in temperature between internal (heated) and external (ambient) – or the inside and outside of the building envelope.

If you would like more information in regards to our Thermal Imaging Surveys, please contact us at or call us Direct on 07775623464.

Alternately, if you would like more information on how to prepare for your BREEAM Thermal Imaging Survey, please visit our website at or Thermal Imaging Inspection Checklist and you can also reference our blog at or our Thermal Imaging Knowledge Base Page which offers handy tips on how to prepare for your Thermal Imaging Survey.

Is Thermal Imaging Survey Worth Doing?

Is Thermal Imaging Survey Worth Doing?

Is Thermal Imaging Survey Worth Doing?
Yes, a thermal imaging survey is an extremely useful type of survey. It is a completely non-invasive method of investigating many aspects of a building that are virtually impossible by any other method and you’ll find heat leaks and many other issues that you’d never find any other way. By actioning the items found during a Thermal Imaging Survey – such as missing insulation in the building envelope – you can reduce the building’s carbon footprint and ongoing costs.

A healthy building envelope also makes the facility more comfortable and healthy for its occupants. This improved environment can also increase productivity and be very beneficial for the life cycle of a building. A healthier building means healthier occupants – a double win for employer and employees.

What are other names for Thermal Imaging Surveys?
This procedure is also known as a thermographic survey, thermal survey, BREEAM Thermographic survey, BREEAM thermographic assessment, heat-loss survey, thermal imaging home inspection or Infrared thermography (IRT).

How much does a Thermal Imaging Survey cost?
This is one of our most common questions regarding thermal imaging, with a very easy answer: it depends on various factors!

How much a thermal imaging survey costs depend on the following:

  1. The type and size of building
  2. The amount of buildings
  3. The preparation required
  4. Potential access issues that may slow down the survey
  5. The projected survey time and equipment required
  6. The location and travel costs/time
  7. The deliverable: in other words, what is type of reportage is required.

Once the above items have been considered, we can forward an accurate fee proposal for the works.

When is the best time to do a Thermal Imaging Survey?
Thermal imaging surveys should generally be conducted in the early hours of a cold morning, approx. 2 hours before the sun rises to prevent solar loading on the building envelope. Generally, when it’s cold outside you heat the building to provide a temperature differential of 10c. The bigger and steadier the temperature differences between inside and outside, the easier the job will be. Also, thermal surveys should not usually be undertaken if heavy rainfall is present at the time of the thermal survey.

It is with noting that it is more difficult to conduct these types of heat loss survey during summer months as the ground temperatures and surrounding building envelope can maintain high temperatures for months on end; however, we can overcome this by using the latest advanced – and sensitive – thermal imaging cameras as well as utilising our highly trained and experienced thermography engineers.

APT Sound Testing
APT Sound Testing is company that provide specialist thermal imaging surveys to customers through all industry sectors throughout the UK including construction and facility management projects throughout London and the South East.

Specialising in electrical thermal imaging surveys and building thermography, APT sound Testing is one of a few companies that only use surveyors that are trained certified to a minimum of ITC Level 2, which is the minimum requirement to undertake BREEAM Thermal Inspections throughout London and the rest of the UK for practising thermographer’s.

We have over 15 years of experience carrying out building thermal imaging surveys in support of industrial and commercial applications, our thermal inspections reportage contains the required reporting structures to satisfy the requirements expected by Construction and Insurance Companies, Facility Managers, Building Control and BREEAM 2011 Assessors etc.

We realise that thermal imaging inspections can be vital in establishing potential defects in your buildings at the earliest possible stage. This can save you time and money during future operations together with reducing the risk of making the wrong decision and potential building shutdowns.

The combination of highly trained and certified and experienced thermographic surveyors as well as high specification calibrated equipment, guarantee our customers the best possible thermal imaging survey report to meet all of your needs.

Our thermal imaging team make sure that customer satisfaction comes first and our surveys are carried out with the upmost thoroughness and expertise.

To learn more about our London thermal imaging surveys and how they can help you maintain your home better, call APT Sound Testing today on 01525 303905. We have the equipment and experience necessary to identify underlying maintenance issues that can lead to expensive and unforeseen maintenance costs.

Whether it BREEAM Thermal Imaging Survey be a Leak Detection Survey, an underfloor heating survey, a damp survey, or an energy efficiency survey, please contact us today and see how we can assist you.

Thermal Imaging Surveys

Thermal Imaging Surveys

Thermal Imaging Surveys

APT Sound Testing provide UKAS accredited sound testing & Thermal Imaging Surveys for London and the whole of the UK as required by Approved Document E of the Building Regulations. We undertake projects on all types of residential buildings and commercial buildings. We also undertake sound testing on schools and buildings containing rooms for residential purposes.

apt sound testing

Thermal Imaging Surveys in London

A thermal Imaging survey is a completely non-invasive method of investigating many aspects of a building that are virtually impossible by any other method.

Thermal Imaging Process

A thermal Imaging survey is an extraordinary method of investigating many aspects of a building that is completely non-invasive.

Thermal Imaging Inspections use IR Thermography to identify a wide range of issues such as:

• Incorrectly applied or inadequate insulation within the building envelope

• Locating air leakage paths into/out of your building

• Moisture infiltration

• Poor moisture barriers

There is no other low impact and accurate way to assess the unseen performance of insulation or the building fabric.

A thermal Imaging Survey can is also ideal for identifying water penetration through roofs or other parts of a building structure, alleviating the need for time consuming water dye tests which are not always accurate.

APT Sound Testing uses the latest Flir Thermal Imaging Cameras for our thermography report generation and as well as utilising the latest software for accurate reportage and trend analysis.

This means or thermal imaging reports can be issued within hours of the survey being completed with recommendations to help our clients deal with every eventuality.

How we Prepare for a Thermographic Survey

What is also important is that there must be no direct or residual solar loading from the sun in the building.

Many companies have their thermal imaging surveys undertaken an hour or so after sunset and this is usually flawed and may lead to inaccurate results. Whilst there may be rate exceptions to this, as a rule, there will be solar load in the building for many hours after sunset.

Therefore, we have learnt to undertake more accurate reportage the thermal imaging surveys should generally be conducted in the early hours of a cold morning, approx.

Two hours before the sun can fall on the building. It is more difficult to undertake conduct these types of heat loss survey during summer months when the ground temperatures and surrounding buildings are at high temperatures for months on end; however, this can be overcome by ramping up internal temperatures within the building and using the latest and more advanced thermal imaging cameras.

In all cases APT Sound Testing will check each project in isolation to ensure the correct site conditions are in place prior to undertaking the thermal imaging survey in compliance with the requirements with BS EN 13187. Building Regulations Part L and this link both offer lots of useful information in regards to Thermography Surveys.

We have years of experience working with a wide range of clients that span both the public and private sectors. We have clients ranging from self-builders through to the largest housing developers. We also work with the health authority and the banking sector on their cleanroom testing. Our clients have benefited from our wealth of knowledge and friendly, proactive service that we provide.

If you need more information on how to prepare your building for a Thermal Imaging Survey please download our air tightness testing checklist. If you would like more information in regards to our, please visit our website or call us Direct on 07775 623464.

Clean Room Testing Services

Clean Room Testing Services

Clean Room Testing Services

Cleanrooms play critical roles in maintaining contamination free production environments for critical processes. To ensure your cleanroom is working as designed it is essential that a well planned and executed cleanroom testing and certification and maintenance program is undertaken for operation and regulatory compliance. APT cleanroom testing offers clean room testing and clean room certification. APT Clean Room Testing specialise in the testing and validation of all types of clean rooms from the Nano technology to the automotive industries.

Clean Room Testing Services

We offer the complete range of performance tests, including non-viable airborne particulate monitoring and HEPA filter testing, through to airflow volume flow measurement and air change rate calculations for non-unidirectional systems. We also offer airflow velocity measurements for unidirectional systems and room differential pressure measurement. Using our latest smoke survey equipment we also offer accurate airflow visualisation testing.  We also offer temperature and humidity monitoring and air tightness testing to check for air leakage paths through the clean room envelope.

Our primary cleanroom tests include:

  • Non-viable particulate monitoring
  • Airflow volume/velocity profiling
  • Room air exchange rates
  • HEPA filter integrity testing
  • Room pressurisation monitoring
  • Temperature and humidity monitoring

Using our technical knowledge and experience in cleanroom testing coupled with our steadfast commitment to quality and the highest standards of customer service we provide our clients with reliable, accurate and thoroughly documented clean room testing results, ensuring optimal cleanroom performance, documented regulatory and quality compliance, and minimised facility down time as most companies clean rooms are their main critical asset.

Following our clean room testing service or validation service, we present you with a clear, well-structured reportage that can be compiled, quality checked and issued to you while still on site, minimising the down time of your operations. We will also take time to explain the process and reportage to ensuring that you fully understand the testing process and your final results.

We will issue you with test certificates, as well as calibration certificates for all of the equipment used and we will also document any recommendations for improvements that could be made to make the clean room more efficient in regards to its operation.

APT Clean Room Testing provide trained clean room test engineers, offering comprehensive and proactive validation service to the requirements of all current ISO standards and guidelines. We are customer driven and continually try to exceed our customers’ expectations, both in terms of price and service. Our careful attention to detail ensures that our reports and certificates are of the highest quality and customers can be confident that their external calibration and validation requirements have been met. Our commitment to quality is backed up by our UKAS accreditation. Our test engineers are well trained, highly motivated and flexible individuals who ensure constant and consistent delivery of our high standards.

ISO Standard 14644-1: 1999 has recently been updated to the 2015 version. It requires changes to sampling procedures and monitoring plans for cleanrooms and clean zones, all of which is outlined in the revised ISO 14644-1:2015 standard. Organisations will be required to redefine their validation sampling plans and data evaluation and will obviously affect the clean room testing reportage.

The updated ISO 14644-1:2015, specifies the classification of air cleanliness in terms of concentration of airborne particles in cleanrooms and clean zones and is the first significant revision since its original release in 1999.

The major change from ISO 14644-1:1999 publication is the adoption of a more consistent statistical approach to the selection and number of sampling locations; and thereafter the evaluation of the data collected. 

This new approach allows each location to be treated independently with at least a 95 % level of confidence that at least 90 % of the cleanroom or clean zone areas will comply with the maximum particle concentration limit for the target class of air cleanliness. Cleanroom users will have to make changes to the cleanroom validation procedures to meet the requirements laid out in the latest version of ISO 14644-1:2015 and ISO 14644-2:2015.  It is possible that the revised standard will require cleanroom owners to make changes to their cleanroom to ensure they continue to achieve the required classification and remain compliant.

If you would like more information on our cleanroom testing services please don’t hesitate to contact Darren directly on 07775623464 or email us at: