Existing Air Tightness Testing

Existing Dwelling Air Tightness Testing

Why Should An Existing Building Be Air Tested?

There is currently no requirement to perform air tightness tests on existing dwellings. However, air tightness test results can now be included within RdSAP 10. RdSAP 10 (Reduced data Standard Assessment Procedure) is the UK's approved methodology for assessing the energy performance of existing dwellings and for producing EPCs for existing dwellings.

 

Currently, a default value is used for the air tightness test score for existing dwellings. Performing an air tightness test can lead to better results and a higher EPC score while also improving the accuracy of the assessment.

 

A low air tightness test score could also identify the need for a more suitable, continuous ventilation system.

What is Air Tightness Testing?

Air Tightness Testing is a process of pressurising or depressurising a building, measuring the air flow during the test, and using this data to calculate the air tightness of the building.


This must be undertaken by an accredited and competent person using equipment which is designed for air tightness testing and calibrated for accuracy.


How do I Prepare for the Test?

Our engineers will require access to the entire dwelling. All internal doors must remain open and any external windows and doors must remain shut.



How is an Air Tightness Test Performed?

 

  1. Any forms of controlled ventilation are sealed. This includes trickle vents, extracts, chimneys and flues. Any external windows and doors are closed. Any internal doors are opened. This allows for airflow throughout the building.
  2. The equipment is set up at one of the dwelling's external doors. A frame is placed in the doorway. A fan is then placed within the frame. One tube is placed externally and one in the geometric centre of the dwelling.
  3. Background/environmental readings are taken.
  4. The fan is switched on and readings are taken at various building pressures. These pressures are lower than the building would experience under the wind.
  5. Background/environmental readings are taken again.


What Happens After the Test?

Once the test is complete, Ashby Energy will provide you with a certificate with the result of the test.


This can then be passed on to the RdSAP/SAP assessor and building control to complete any other certificate of the building.

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