Month: April 2024

Air Tightness Testing

Air Tightness Testing

Air Tightness Testing Services

APT Sound Testing offers comprehensive Air Tightness Testing services across the United Kingdom. We cater to projects of all scales, ranging from individual dwellings to expansive commercial structures. As one of the select few UKAS accredited companies, we specialise in both Air and Sound testing, ensuring full compliance with Building Regulations and Standards.

Air Tightness Test

Our unique accreditation allows us to conduct Air, Sound, and Vent Testing all in one visit, offering clients cost efficiencies and streamlined on-site coordination. Unlike many firms, we handle all work directly without subcontracting.

Since its mandate in 2006 under Building Regulations Part L in England and Wales, achieving satisfactory levels of air tightness has become imperative. This requirement aligns with efforts to create environmentally friendly buildings by minimizing carbon emissions through the prevention of energy loss via air leakage. Part L defines ‘air leakage’ as the uncontrolled flow of air through a building’s gaps and cracks, commonly known as draughts.

Energy loss through the building fabric contributes to the building emission rate. New projects must adhere to specific air testing and emission rate standards. The typical target for a standard dwelling is 5.0m3/hr/m2, while commercial buildings often aim for lower rates, around 3.0m3/hr/m2.

Air infiltration usually accompanies exfiltration elsewhere in the building, potentially leading to issues like condensation, mould, or rot. Our consultancy services extend from the project’s design phase to pre-completion testing, ensuring compliance for building control signoff. For clients requiring weekend testing, we offer an ‘out of hours testing’ service to minimize disruption during weekdays.

Our combined air and sound testing packages provide substantial cost savings. With our engineers accredited in both disciplines, clients benefit from a streamlined ‘3 step’ pre-completion package, eliminating the need for multiple contractors. On-site coordination is enhanced, as both tests are conducted efficiently on the same day. Additionally, we offer out of hours testing to minimize disruption during standard working hours.

We pride ourselves on offering friendly, expert advice to help properties achieve required emission rates for air testing. Reach out to our knowledgeable team of air tightness consultants through our contact form or by calling our offices to discuss your specific air testing needs.

We can help with your Air Tightness Testing

APT Sound Testing we have large amount of experience in understanding the requirements of Approved Document L, along with extensive experience of carrying out thousands of successful air tightness tests on a wide range of developments across London and the UK.

In order to achieve the required air tightness target (which is getting lower all the time) and to avoid the risk of a failed air tightness test, we strongly recommend that early consideration is given to the design of the air leakage line within your project.

By working with our customers throughout their design and construction stages, we can provide advice and guidance on the most feasible ways to avoid air leakage and attain compliance for the air tightness test. Please download our air tightness checklist to help you prepare for your test.

Guide to Passing a Smoke Shaft Air Test

Guide to Passing a Smoke Shaft Air Test

How to Pass a Smoke Shaft Air Test
Achieving success in a smoke shaft air test is vital for ensuring building safety and regulatory compliance. However, passing the test on the first attempt can be challenging. Here’s a condensed guide outlining essential steps to prepare your smoke shaft for the air tightness test:

  1. Consultation with Experts: Seek early advice from air tightness consultants for insights into effective smoke shaft design and sealing strategies.
  2. Determine Air Tightness Target: Establish the airtightness goal, typically less than 3.8 m³/h/m² @ 50 Pa, which can be challenging for small enclosures like smoke shafts.
  3. Optimal Design: Ensure robust construction materials like concrete or high-density blocks to create a tight air barrier with no mortar joint gaps.
  4. Interior Finish: Smooth and seal the inside of the shaft meticulously, including all junctions and joints, using appropriate methods like parge coating or mastic sealing.
  5. Seal Penetrations: Completely seal all service, structural, and cable penetrations within the smoke shaft envelope.
  6. Secure Door Openings: Use heavy-duty materials to seal all door openings within the smoke shaft to prevent leakage.
  7. Seal AOV Door Frames: Mastic seal the perimeter of AOV doors to prevent leakage.
  8. Seal Shaft Base and Head: Ensure thorough sealing of the shaft’s base and head before the air test.
  9. Conduct Air Testing: Use a calibrated blower door fan set to pressurize the shaft and measure air tightness according to CIBSE TM23 standards.
  10. Address Test Failures: If the shaft fails the test, employ smoke testing or thermal imaging to identify and seal leaks, producing a detailed leakage survey report.

For comprehensive assistance in smoke shaft systems, consult experts specialising in smoke shaft design and compliance. Utilise services from UKAS accredited air tightness consultants and testing companies, equipped with the latest high-powered fan equipment and diagnostic tools like smoke machines and thermal imaging.

UKAS Accredited

We are a UKAS accredited, as well as being certified to ATTMA Level 2 for air tightness testing. For a detailed guide, you can refer to our article that provide a comprehensive roadmap and tips for preparing your smoke shaft for an air test. It’s advisable to consult with UKAS accredited air tightness consultants early in the process to increase the chances of passing the smoke shaft air test on the first attempt.

How We Can Help you PASS your Smoke Shaft Air Test

There are many ways we can help you pass your smoke shaft air test at the first attempt. Firstly, our experienced engineers have over 10 years in the field of smoke shaft testing – having undertaken hundreds of air test, so we know how to help clients to pass their testing:

Our simple roadmap to a successful smoke shaft air test:

Smoke shaft survey visits by experienced air tightness consultants.
UKAS and ATTMA Level 2 air testing company
UKAS smoke shaft air test certification
The latest high-powered fan equipment
UKAS calibrated equipment
Diagnostic leakage surveys testing using smoke machines & thermal imaging
Rapid testing service – sometimes within 48 hours!

We offer leading design, consultancy, and compliance for every part of your project. It’s APT’s aim to provide a friendly and professional stress-free experience.

Please contact APT on 07775623464, or email us at for more information.

Premier Acoustic Consultants in the UK

Premier Acoustic Consultants in the UK

As premier Acoustic Consultants, we provide comprehensive solutions to meet all your acoustic needs, ensuring compliance with planning regulations and Building Regulations Part E for seamless project approval. With our expertise, your company is guided through every phase with professional advice, maintaining a continuous focus on cost considerations.

Sound Testing Services

From Initial Design to Pre Completion Testing

Our services begin with on-site visits to conduct sample sound insulation testing on existing building walls and floors, evaluating their acoustic performance against established standards. Armed with this data, we proceed to tailor an acoustic design strategy that aligns with Building Regulations Part E requirements.

From the initial design phase to pre-completion sound testing, we assist in shaping the acoustic aspects of your project. Our meticulous approach involves analyzing construction elements such as mass, isolation, and absorption to optimize acoustic performance.

To facilitate compliance with Approved Document E, we offer a comprehensive 4-step acoustic design advisory package:

  1. Site Survey Visits: Our experts assess existing site construction to identify potential issues and ensure proper installation of acoustic materials.
  2. Sample Sound Testing: Accurate evaluation of existing construction’s acoustic performance informs targeted acoustic design recommendations.
  3. Acoustic Design Review: A thorough examination of proposed party walls and floors to ensure compliance and optimal acoustic performance.
  4. Pre-completion Sound Testing: Fulfilling requirements outlined in Approved Document E for sound insulation testing, ensuring project approval.

Acoustic Design Services

We have many years’ experience of acoustic partition design on all types of developments from pairs of semi-detached houses, up apartment blocks containing hundreds of residential units. Utilising our vast experience in construction design, and the data from thousands of sound insulation tests, we have a clear understanding of the positives and negatives of all types of construction.

We are also a UKAS accredited sound testing laboratory which means we can offer a comprehensive design and testing solution for all your acoustic requirements. We can test and issue certification on completion of any works carried out and you can be safe in the knowledge that the results will be accepted by the tasked building control officer.

For further details on our acoustic consultancy services, please refer to the information below. Should you require Sound Insulation Testing as requested by local authorities, please contact us at 01525 303905 or via email at