Net Zero Energy Homes are becoming increasingly popular in New Zealand. As the cost of electricity in New Zealand continues to rise, without any apparent justification, New Zealanders are becoming resentful towards
Changes to the Building Code 2021 - Focus 'Energy Efficiency for Housing and Small Buildings'
Building Code Update 2021 - Focus 'Energy Efficiency for housing and small buildings'
- Energy Efficiency for housing and small buildings
- Update the existing H1 Acceptable Solution.
- Introduce new climate change zone maps (6 zones).
- Review Insulation Levels for different building elements - focusing on Roof, Windows, Wall Insulation and Underfloor Insulation
The 'status quo' is an R value between R2.9 and R3.3. Options for upgrades range up to R9.0! I'm not sure that's so realistic, but if the changes were to be this, the industry and thinking would have to change dramatically. The options vary for each of the climate zones, but taking this very simply, doubling of insulation would seem to be a minimum. For skillion or low pitch roofs, where space is just not available for just thicker insulation, fresher thinking and more efficient insulation materials will be required. Perhaps this type of problem/challenge is what the industry needs, giving the manufacturers a good shake up, making new opportunities in the market for other companies to exploit?
Current 'status quo' has an R value of R0.26. Options range between R0.26 and R0.76. MBIE acknowledge that achieving R0.76 with aluminium frames is not easy. That would be a difficult to persuade the industry, that has been very loyal to aluminium over the past few decades. from my experience, window joinery upgrades are also extremely expensive, for the least benefit. Usually there are more cost effective wins elsewhere.
Potentially up to R5.0? Even the R2.2-R2.8 options will require framing increase to 140mm, or presumably again, some dramatically different thinking!
Current 'status quo' has an R Value 1.3, with proposed changes up to R4.8. Easily improved as he existing R1.3 is basically un-insulated. In new builds, the floor slab is an area of easy improvement.