Although the Design-stage certification was to the Passivhaus standard, the best post-build air tightness test result only gave a reading of 0.9 which is not sufficient for the full Passivhaus certification (which must be 0.6 or lower). In principle it’s still possible to fix the air leaks and obtain Passivhaus certification but since that’s likely to be disruptive and to take some time I decided to proceed with Passivhaus Institute “Low Energy Building” certification instead.
The certification was done by Kym Mead; he sent the certificate a while back and I’ve just now installed the plaque.
To act as a bit of a wind-break and to help divide up a large expanse of grass there’s been a plan for a while to have a new hedge running at right angles to the existing boundary hedge and heading towards the south-west corner of the house.
Sue Hayward recommended Hornbeam which is a bit like Beech but much more tolerant of wet conditions (and it’s really quite wet near the boundary hedge). It’s a native species but more formal than Hawthorn or Blackthorn.
This is a perfect time of year to get bare-rooted plants into the ground and local company Woodgrow Horticulture supplied some nice 60-80cm specimens for less than £1 each. The hedge is 12m long and will be clipped to 1m wide (which is roughly the width of the bare soil in the photo). A staggered double row at 50cm spacing needed 47 plants.