What is an air leakage test?

An air leakage test is used to determine the level of uncontrolled air flow through gaps or cracks in the fabric of a building. The result of the air leakage test is expressed as a quantity of air leakage (m3 per hour per square metre at 50 Pascal`s of the building envelope).

The general requirement of Approved Document L1A is that each dwelling tested must achieve a maximum air permeability rate of 10m3/h/m2 @ 50pa. However, in order to comply with the carbon emission target a lower air permeability rate may be required. The required air permeability rate for each dwelling can be found on the design-stage SAP report for that dwelling.

Too much air leakage leads to unnecessary heat loss (and consequently, higher CO2 emissions) and can lead to discomfort to the occupants through cold draughts

Pre Air Test Checks

Before the air test can be completed there are a number of requirements for example, the stage of completion of build, power supply to the property.

There will be a comprehensive check sheet that will be sent prior to a booked test, this will need to be completed before for the airtightness test can be performed