Guest post by Sustainable Engineering | The New Zealand building industry is walking blindly once again. As we transition to higher thermal performance targets, the way we’ve always built simply doesn't work anymore. If you treat a highly insulated, airtight build like a standard code-minimum house from ten years ago, you are taking on massive structural and financial risk.

Window & Glass Association's Technical Manager, Rob Campion, compares AS 2047 and TS 4211. The differences, while subtle, are exactly the kind of thing that can create a consent problem or a weather-tightness failure if they're not well understood and incorrect selections are made.

Window & Glass Association's Technical Manager, Rob Campion, shares new guidance on the classification of windows and doors when tested to comparable international standards, looking at the most common classifications from Australia, Europe and America.