What Is a Pulse Air Tightness Test and Why Is It Required for New Builds?

Pulse air tightness testing has become an important part of modern construction in the UK. With increasingly strict building regulations focused on improving energy efficiency and reducing carbon emissions, new build properties must demonstrate that they meet specific standards for air permeability.

A pulse air tightness test measures how much uncontrolled air leaks through gaps and cracks in a building’s structure. This test is carried out to demonstrate compliance with Part L of the Building Regulations, which focuses on improving the energy performance of homes.

Pulse testing provides a fast and efficient method of measuring air leakage while causing minimal disturbance on site.

Why Air Tightness Testing Is Important

Air leakage can significantly impact the performance and efficiency of a building. When warm air escapes through gaps around windows, doors, or poorly sealed construction joints, the heating system has to work harder to maintain comfortable indoor temperatures.

This can lead to several issues including:

• Higher energy bills

• Reduced comfort for occupants

• Lower EPC energy ratings

• Increased carbon emissions

By measuring air leakage, pulse air tightness testing helps ensure a building performs efficiently and meets the required energy standards.

When Is a Pulse Air Tightness Test Required?

For most new residential developments in the UK, building control requires an air tightness test before the property can receive final approval.

Testing is usually carried out:

• At the completion stage of construction

• Before the Energy Performance Certificate (EPC) is produced

• Prior to building control sign-off

Developers typically arrange the test once the building envelope is complete and all windows, doors, and internal finishes have been installed.

How a Pulse Air Tightness Test Works

A pulse air tightness test uses specialist equipment to quickly measure the air permeability of a building.

During the test, a compact pulse unit is installed in an external doorway. The equipment releases short pulses of air into the building and measures how the internal pressure responds. From this data, the system calculates the amount of air leakage within the building fabric.

The test helps identify air leakage from areas such as:

• Gaps around windows and doors

• Pipe and cable penetrations

• Loft hatches and service openings

• Poorly sealed construction joints

The final result is measured as air permeability, which must meet the target set during the SAP calculation stage of the project.

Advantages of Pulse Air Tightness Testing

Pulse testing offers several advantages compared to traditional blower door testing.

These include:

• Faster testing process

• Less disruption on site

• Compact and portable equipment

• Suitable for occupied properties

• Reliable and accurate results

Because of these benefits, pulse air testing is becoming increasingly popular on construction sites across the UK.

Tips to Pass Your Air Tightness Test

Builders and developers can improve their chances of passing the test first time by ensuring good airtightness practices during construction.

Helpful steps include:

• Properly sealing service penetrations

• Installing airtight membranes correctly

• Ensuring loft hatches are well sealed

• Checking the installation of windows and external doors

  
  

Attention to detail during construction can significantly improve the overall airtightness performance of a building.

Professional Pulse Air Tightness Testing

At Air Metric, we provide professional pulse air tightness testing for new builds and extensions, helping developers achieve compliance with UK building regulations.

Our experienced assessors carry out fast and reliable testing to ensure your property meets the required air permeability targets and progresses smoothly through the building control process.

If you require pulse air tightness testing for your development,

Contact Air Metric today to arrange your test.