Air Tightness Testing

In Scotland, air tightness testing is required for all new buildings, including residential and non-residential buildings, as well as buildings undergoing major renovation.

Building Services- Onsite Verification

Air Tightness Testing

Air Tightness

Air tightness refers to the measure of how effectively a building or structure can prevent air leakage between the interior and exterior environments. In other words, it is a measure of how well the building envelope, which includes the walls, roof, windows, doors, and other components, can prevent air from entering or escaping.

The air tightness of a building is typically measured using a blower door test, which involves using a fan to pressurize or depressurize the building and then measuring the resulting air flow through any leaks or gaps in the envelope. A lower air leakage rate means that the building is more air tight and can result in improved energy efficiency, indoor air quality, and overall comfort. However, achieving high levels of air tightness requires careful design, construction, and testing to ensure that the building is still adequately ventilated and free from issues such as condensation and mould growth.

Air Tightness Testing

In Scotland, air tightness testing is required for all new buildings, including residential and non-residential buildings, as well as buildings undergoing major renovation. The testing is required to comply with the Scottish Building Regulations, specifically Section 3 (Ventilation) and Section 6 (Energy) at the SAP/EPC stages.

The air tightness testing is carried out by our partner certified air tightness tester under the Air Tightness Testing and Measurement Association (ATTMA) guidelines.

The testing involves pressurizing the building and measuring the air leakage using specialized equipment. The results are reported as an air permeability rate, measured in cubic meters per hour per square meter of building envelope area. The maximum permitted air permeability rate for new buildings in Scotland is 7m3/ @50Pa.

It is important to note that the air tightness testing requirements may vary depending on the specific ventilation design of the building, so it is always recommended to consult with a qualified professional to ensure compliance with the relevant regulations.

How many tests to do?

In many cases, a single air tightness test performed at the end of construction or during commissioning can be sufficient to verify the overall air tightness of the building envelope. This test can help identify any leaks or areas of concern that may need to be addressed before the building is occupied.

However, in some cases, additional air tightness testing may be necessary, such as if a particular low value is needed or in a retrofit. In these cases, it may be useful to perform additional air tightness tests to ensure that the building will meet the desired air leakage targets and to identify any new leaks that may have been introduced.

Further Case Studies:

Independent Service Engineers

How We
Can Help

Traditionally heating/services were a standard work package handled by the trades and architects but buildings, regulations and the needs of the client have become more complex over time, and rightly so. Heating is integral to the comfort and well-being of your home/work and is only now been given proper consideration in the build. Also, often it can have the largest impact on operating cost for you in terms of bills and carbon impact over the long-term. In addition, there are a multitude of options available with renewable technologies in a fast-changing market. There can be a considerable cost benefit to have input from specialist independent building service engineers at several stages.

Use our decades of experience

Appointing an engineer to deal with the all services will save you time, money and energy!

Contact Us

Energy is complex!

our professional services Include:

Lùths Services are an independent services engineering consultancy who specialise in low energy and renewable design and implementation. 

Issues that may arise in Services

  • Oversizing Services
  • Non flexibility of approach to large / small projects
  • Non suitability of technology in reality
  • Lack of integration between services

Energy Performance Certificates

We are accredited for on construction SAP calculations, existing dwellings EPC and non domestic EPC calculations.

Electrical Design

Including sizing AC and DC cables, containments requirements and connections to the network including export limiting.

Renewable Energy Assessments

A full design and estimating service for onsite renewables such as heat pumps and solar PV.

Mechanical Design

We can provide a full design service for MEP projects. We specialise in heat pumps, low carbon and renewable projects.