Though the building wasn't designed as a passive house, careful attention to
airtightness using Ampack's range of tapes and membranes, with particular attention paid to key junctions such as windows, chased walls and a counterbattened service void in ceilings, leading to an
impressive pressure test result of 0.48 ACH.
Meanwhile Darren O'Gorman of Target Zero says the final
airtightness result of 0.99 air changes per hour is
impressive for such a complicated project.