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

We perform air tightness tests according to the current standard ISO 9972, but have ceased our membership of the NSAI air tightness testing scheme in October 2020. Our clients deserve genuine air tightness testings with permanent continuous professional development rather than a membership of a testing scheme where everyone can become a member without the need to demonstrate a certain experience and education of the air tightness trade. To be clear - there are many knowledgeable air tightness testers on the NSAI scheme but the scheme itself doesn't provide any benefit to the members, unless you're dealing with "certificate chasers". 


To achieve a good final air tightness 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 7 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.

Attention! By the end of 2020, the new legislation for nZEB is coming in place. This regulation requires an air permeability of maximum  2m³/m²h @ 50Pa differential pressure. We always 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 genuine test result, the test should be done in calm weather with almost equal outdoor and indoor temperature.

Survey and consultation for (existing) homes

prodomo Ireland is specialised in surveying new and existing buildings regarding issues with draught, heat loss, dampness/mould, odour pollution or lack of sound proofing. 

Such a test can be can be done all year round and the included report will state and explain existing difficulties and also provide suggestion how to get them sorted.

Depending on the size of the building, the survey will take approx. 2-4 hours on site and the report will be delivered within 5 working days after the testing.

You don´t need to leave the building during the survey, we just need access to all areas, you wish to have surveyed.