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🚪 Impressive airtightness results from our latest blower door testing in New Zealand! We recently assessed a range of homes to compare airtightness performance (ACH₅₀) - and the results clearly show how modern high-performance building systems stack up against older construction. Here’s how they measured up ⬇️ 🏠 1970s Lockwood home (225m², renovated in 2016 with new joinery & double glazing): 5.79 ACH₅₀ 🏠 1950s weatherboard home (154m², single glazing): 8.30 ACH₅₀ 🏠 2025 DEVPROᵀᴹ SIP home (Homestar Level 10 certified): 0.80 ACH₅₀ 🎉🔥 For context, the NZ Building Code has no airtightness limit, while Homestar standards typically range from 6–10 ACH₅₀. That makes the DEVPROᵀᴹ SIP home a standout for energy efficiency, indoor comfort, and long-term performance. If you’re looking to improve your home’s airtightness - or want to build a high-performance, energy-efficient home in Whangārei or Northland - let’s talk. 🏠 Based in Whangārei, New Zealand 📍 Building high-performance homes across Northland and the Pacific #NZBuilding #EcoFriendly #HighPerformanceHomes