Using thermally efficient roofing materials like COLORBOND steel can help reduce your cooling and heating costs. In summer, a lightweight insulated roof made from COLORBOND steel can assist in minimising the amount of heat radiated into your home at night. That’s because COLORBOND steel has a low thermal mass, so it cools down fast once the sun is off it. In winter the same steel roof, properly insulated, helps keep the heat inside. Building Regulations for your area will prescribe the level of insulation you will require. The choice of colour can also influence thermal performance. Lighter colours, in particular, radiate less heat during summer. Building regulations may allow you to install less insulation if you use lighter colours in warm climates.