by Paula Hugens, eZED Ltd | Updated 22 February 2015

Plenty of details are regarded as Acceptable Solutions in New Zealand when they are not even close to being satisfactory. I have no idea how they ended up being so entrenched in the industry. Convincing building professionals they are a problem is a huge battle, the attitude to change is that it always results in extra cost. But what about the long term cost?

In this series I will cast the spotlight on some of the worst details we regularly come across and explain why they are a such problem. What I can’t fathom is that some of these details are being used on self-proclaimed sustainable buildings. As far as I am concerned these deserve an automatic fail.

Some Building Consent Authorities have worked out some of these problems themselves, yet some of the clauses to the NZBC are so permissive that the authorities are toothless. It also makes it hard for us to argue a point when we are told, “But that is how the detail is shown in E2”.

Over the next few weeks we will prepare detailed explanations as to why these details have made it to our worst 10 listing and methods to avoid or mitigate the problems. These are in no particular order: –

  1. Structural steel ridge beams, read more …
  2. Strapped and lined concrete and concrete masonry walls, read more …
  3. Retrofitting insulation in period timber framed buildings
  4. Timber thermal breaks to perimeter footings
  5. Steel rafter/purlins in skillion roofs
  6. Timber framed buildings with no airtightness envelope
  7. Cantilever concrete decks
  8. Roof detailing that traps moisture
  9. Thermal bridges under footings
  10. Decks over conditioned spaces

Windows are typically so horrible that they will be getting their own series so wait for that.

 

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