Energy Rating

The National House Energy Rating Scheme (NatHERS) rates the thermal performance of residential buildings on a scale of 0 to 10 stars. The NCC currently requires new homes and major renovations to achieve a minimum 7-star NatHERS rating (increasing to 7 stars nationally under NCC 2022). The roof is one of the most significant contributors to a building's thermal performance, as it is the largest surface exposed to solar radiation and the primary pathway for heat gain in summer and heat loss in winter. Key roofing factors that influence energy rating include: the total R-value of the ceiling insulation; the presence and type of sarking (reflective foil sarking can contribute an additional R-value by reducing radiant heat transfer); the solar absorptance of the roof colour (lighter colours reflect more solar radiation, reducing heat gain); and the effectiveness of roof ventilation in managing heat build-up. The choice of roof colour alone can make a difference of 0.5 to 1.0 stars in the NatHERS rating. In Gippsland, achieving energy-efficient roofing is important for both regulatory compliance and household comfort and running costs. The region's cold winters mean that ceiling insulation is critical for retaining heat, while warm summers — particularly in the drier eastern areas — require attention to heat reflectance and ventilation. Town & Country Roofing can advise on roof colour selection, insulation options, and ventilation solutions that optimise the energy performance of your roof system.