I.S. EN ISO 9972:2015 - Thermal Performance of Buildings - Determination of Air Permeability of Buildings - Fan Pressurization Method

We perform NSAI certified air tightness tests for buildings (Thermal Performance of Buildings - Determination of Air Permeability of Buildings - Fan Pressurization Method).

prodomo Ireland´s official NSAI file number is 1.91.081

You can find more details about the scheme on the official NSAI website.


To achieve a good final test result, we recommend a preleminary test of the building during the construction stage. Because of the fact that the final test (official test according to Part L, for inclusion in BER) has to be made at the very end of the construction phase, the option to eliminate potential leakages is very limited.


There are two main values, regarding the air tightness of buildings - the air change rate (𝑛) and the air permeability (𝑞𝐸).

The air change rate shows the quantity of air changes per hour at a certain pressure differential (usually at 50Pa).

The air permeability indicates the air leakage rate per square meter of the building envelope at a reference pressure differential. This is the mandatory value here in Ireland, as coming from Part L of the building regulations. The air permeability at 50 Pa pressure differential (𝑞𝐸50)  has to be 5 m³/m²h or less, to fullfill the current building regulations. New builds with a mechanical heat recovery ventilation system should not exceed an air permeability value of 3 m³/m²h.

We aim to deliver air tightness strategies and products, to allow our clients with standard houses maximum values of approx. 1.5 (𝑞𝐸50 + 𝑛50).


Please notice that an official air tightness test is depended to some technical requirements. To achieve a clear and true test result, the test should be done in calm weather with almost equal outdoor and indoor temperatures.


Survey and consultation for existing homes

Furthermore we deliver a full range of consultation, testing, research and renovation proposals to get your trouble with draught, heat loss, dampness or mould solved.

These services are available for new building projects and existing houses.

Please find some images about our range of surveys down below.