Roof Insulation and Ventilation

One of the most cost-effective ways to make an existing home more sustainable is by addressing insulation and ventilation in the roof space.

Insulation

Avoid installing low-rated products such as R2.0 batts — these provide minimal benefit relative to their cost. Instead, opt for R5.0 insulation or higher. This level of insulation delivers a significant improvement to internal comfort, reduces the energy required for heating and cooling, while still offering good value for money.

Correct installation is essential. Poorly fitted insulation leaves gaps that undermine performance. As there are serious safety risks when working in a roof space. Engaging a qualified professional is strongly recommended. Once the installation is complete, the work can be checked using thermal imaging to ensure full coverage. Some installers will provide this service, or you may hire a thermal camera to carry out the check yourself.

Ventilation

Roof ventilation serves two critical functions: managing summer heat and reducing winter condensation.

An automated roof cavity exhaust fan, controlled by an in-roof temperature and humidity sensor, consumes less energy than an LED light. It improves the efficiency of the dwelling, broadens the comfort range indoors, and extends the building’s lifespan. For effective operation, the fan must be paired with either vermin-proofed eave vents or ventilated ridge capping, ensuring a continuous flow of air.

• Summer: Roof cavities can reach temperatures above 60 °C in summer. This forces hot air into living spaces through openings such as exhaust vents, downlights, skylight shafts, and particularly ducted air-conditioning shafts. An automated exhaust system, such as the CSR Airomatic, expels this extreme heat and reduces the thermal load on habitable areas.
• Winter: When indoor spaces are heated, the dew point often falls within the roof cavity, leading to condensation build-up. This moisture accumulation can damage the building structure and contribute to poor indoor air quality, with potential health consequences for occupants. Automated exhaust ventilation helps mitigate these risks by removing moisture from the cavity.

Contact us to learn more on how to improve the efficiency of your home.