Our latest PassivHaus project, a private house in an exposed location at Dundry completed first stage airtightness testing before Christmas. This is a key stage for PassivHaus projects, testing airtightness on the building envelope before starting second fix. Ensuring the building is adequately airtight at this stage should ensure that final airtests are likely to be achieved.
The PassivHaus requirement is 0.6 ac/h. Testing carried out by Paul Jennings of ALDAS showed the building flew through this stage, achieving 0.3 ac/h - a testament to the (self-build) client’s attention to detail and the robustness of the ICF construction method.