The Most Airtight Building in the UK
Overall the greatest triumph on this project we feel is the achievement of such a high level of airtightness within the house, down to 0.07 air changes per hour at 50 Pascal’s. This was accomplished through quality control, excellent workmanship and a high level of detail. This high level of air tightness has greatly reduced the heat losses, a 19% improvement from the minimum Passivhaus requirement of 0.6.
Building materials were selected by their environmental credentials for the longevity, low toxicity, low embodied carbon, reusability and recycled content. Natural materials were used where possible. A very visible example of this is the Kebony cladding, a soft wood treated with a natural process to achieve the longevity of hardwood.