What is Air Tightness Testing?
Commonly referred to as blower-door testing, an air tightness test determines the air tightness of a building by measuring air leakage rates through the building envelope. This is done under controlled pressurisation and depressurisation of the building by a fan.
The fan simulates a pressure difference (usually 50 Pascals) between inside and outside the building compared to natural air pressure. This allows for any cracks or gaps to be identified.
The data recorded is then analysed and the final result is expressed as the rate of leakage per hour per square metre of the building envelope at a pressure difference of 50 Pa. This is calculated by dividing the total leakage flow rate by the envelope area.
In part L of the Building Regulations in Ireland, it requires that a performance level of air permeability must be less than 7 m3/hr/m2 @ 50Pa. If a dwelling tested is greater, then areas for improvement will be pointed out and the house will need to be re-tested until the required performance level has been achieved.
In part L of the Building Regulations in Ireland, it requires that a performance level of less than 7 m3/hr/m2 @ 50Pa for air permeability must be achieved. If a dwelling tested is greater, then areas for improvement will be pointed out and the house will need to be re-tested until the required performance level has been achieved.
We are glad to announce that we currently provide this service and that we are NSAI Registered.
