Building Regulations for Northern Ireland, through Technical Booklet F (‘Conservation of Fuel and Power’), stipulate the air tightness testing of buildings. Currently this requirement exists in both Technical Booklet F1 and F2
TB Part F1 - Conservation of fuel and power in dwellings - June 2022
TB Part F2 - Conservation of fuel and power in buildings other than dwellings - June 2022
On each development, an air pressure test should be carried out on three units of each dwelling type or 50 per cent of all instances of that dwelling type, whichever is the less; and at least one of each type should be tested. The dwellings to be tested should be taken from the first completed batch of units of each dwelling type to confirm the robustness of the designs and the construction procedures
Section 2.62
Each block of flats should be treated as a separate development irrespective of the number of blocks of flats on the site.
Section 2.63
The dwellings selected for test should be chosen by the district council in consultation with the pressure tester. They should be selected so that about half of the tests on each dwelling type are carried out during the construction of the first 25% of the dwellings of that type. All tests on dwellings in the sample should be reported to the district council including any test failures
Section 2.64
In addition to the remedial work on the dwelling that failed to achieve its design air permeability – (a) one additional dwelling of the same type should be tested to increase the overall sample size; and (b) other dwellings of the same dwelling type that have not been tested should be examined and, where appropriate, similar remedial measures should be applied.
Section 2.65
Technical Booklet F1 is very specific about what a ‘dwelling type’ is.
Section 1.2 states:
To be classed as of the same type, dwellings should:
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