The recent research conducted by CSIRO has highlighted the importance of air tightness in Australian homes. It was discovered that new homes are now up to 50% more airtight compared to those tested back in 2015. This improvement is beneficial for homeowners as it contributes to increased comfort levels, lower energy bills, and healthier indoor air quality. By minimizing unintended air movements within a building, air tightness prevents outdoor air from entering and indoor air from escaping. However, poor air tightness can lead to drafts and a potential increase in energy bills by up to 20%. On the other hand, homes that are overly airtight without controlled ventilation can result in condensation, mold growth, and various health issues for residents.
The research involved testing 233 apartments and detached houses constructed in the last four years across major cities in Australia. While the results were positive and aligned well with international standards, including those in the U.K., there is still room for improvement. Leakages were identified in most new homes, primarily from areas such as bathroom fans, sliding doors, and inadequate door seals. Some apartments were found to be excessively airtight, which could negatively impact building performance and resident health without proper ventilation. Senior Experimental Scientist Michael Ambrose emphasized the importance of addressing these air tightness issues through simple and affordable solutions.
The report highlighted several recommendations for Australian building codes to enhance air tightness in residential buildings. These suggestions include establishing air tightness standards in the National Construction Code (NCC), mandating controlled ventilation in new buildings, making air barriers such as building wraps mandatory in all new residences, and providing training resources for builders. It was noted that the actual air tightness levels closely matched those assumed by the Nationwide House Energy Rating Scheme (NatHERS), indicating the scheme’s accuracy in predicting air tightness within specified levels. Ambrose suggested displaying air tightness values on NatHERS certificates to emphasize their impact on the energy efficiency star rating.
The research conducted by CSIRO sheds light on the significance of air tightness in modern Australian homes. While improvements have been made in recent years, there is still a need for better adherence to air tightness standards to ensure optimal building performance and resident well-being. By implementing the recommended measures in building codes and utilizing cost-effective solutions, homeowners can achieve greater comfort, energy efficiency, and indoor air quality in their homes. It is crucial for both builders and residents to prioritize air tightness to create healthy and sustainable living environments.
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