Improving Sustainability of Steel Roofs: Life Cycle Assessment of a Case Study Roof

In New Zealand (NZ), steel roofing is the most common type for residential buildings. However, environmental impact of roofs are not negligible. Steel account up to 30% upfront embodied carbon a typical NZ house, highlighting importance investigating and reducing impacts in meeting net-zero goal government. There several research gaps roofs, such as variation emissions between local imported coil products, unavailability life cycle assessment (LCA) data, additional from ancillary items. Therefore, this study performed an LCA case roof investigate these using GaBi Ts software. It was found that overall including items, were 12 kg CO2-eq/m2, where items accounted less than 10% total emissions. The prepainted coils manufactured globally had 70% when compared locally coils. addition, roll forming processes insignificant effect on emissions, whereas transportation notable impact.