Airtightness Testing

BRE is able to undertake airtightness testing for the building being assessed to the Passivhaus standard. The airtightness test results will be supplied as an n50 and Q50 values calculated using the mean of tests undertaken under positive and negative pressurisation, which is a requirement for Passivhaus Certification. Our recommended stages for airtightness testing are provided below:

On-site check 1 (First-Fix):

It is recommended that the first pressure test is carried out upon completion of first-fix and prior to installation of plaster/plasterboard airtightness testing at this stage will identify the location of significant air leakage paths and if necessary, provide sealing followed by a retest. 

As part of this site visit BRE will:

  • Undertake a pressure test of the unit(s)
  • Provide any advice onsite to the client/site-manager regarding any problems observed in terms of thermal insulation, installation of pipes/ductwork, control systems etc

On-site check 2 (Second-Fix):

The second site visit is to be carried out upon completion of the second-fix.  Newly created air leakage paths will be identified and if necessary, remedial work will be applied by the building contractor and the building retested. 

As part of this site visit BRE will:

  • Undertake a pressure test of the unit(s)
  • Undertake a pressure test of the unit(s), this post-construction air pressure test will be provided in both n50 and Q50 results for Passivhaus Certification and SAP and building regulation requirements, an ATTMA registered report will be issued.

Depending on the complexity of the project BRE may advise on additional intermediate airtightness testing of the building during construction.