Roof ventilation has become increasingly important to maintain high liveability, health and safety standards in Australian buildings. There are five key reasons to ventilate your roof.

Reduce Temperature

Roof ventilation allows hot, stagnant air that builds in the roof space to disperse to cooler outside air, which decreases the overall temperature of the structure.

Cost and Energy Efficient

Decreased temperature means less need for costly air-conditioning systems. A well-ventilated roof means air-conditioning ducts can operate at lower temperatures, therefore using less power to cool the structure.

Condensation Management

In Australia’s diverse climates, stagnant air in the roof can cause condensation to form. Because ventilation increases airflow, the chance of condensation forming is reduced. This is a preventative measure against the build-up of mould, which is a national health hazard.


The National Construction Code has been updated to reflect the Australian Building Code’s Board’s actions to reduce condensation and increase energy efficiency. Roof ventilation reduces condensation and increases energy efficiency and is therefore an important aspect of these changes.

  1. Reduce Internal Pressure

Large commercial buildings require ventilation to ensure internal and external pressures are maintained to withstand natural elements and ensure structural integrity

Furthermore, positive airflow across the ridge of the house creates a negative pressure which pulls air out from the ridge vent system and brings in fresh air from the intake vents below. In either calm or windy conditions, the entire ceiling cavity is vented by a constant flow of cooler, dryer outside air. These key factors create and maintain effective and efficient air flow.



Provides weather-tight ventilation from wind and rain

Continuous airflow helps prevent condensation and humidity

Prevents the build-up of mould and mildew within the ceiling cavity, decreasing health risks

Utilises the natural flow of air – no power, moving parts or noise

Maintains a clean, attractive roofline – hidden underneath the ridge cap

Improves and maintains a comfortable internal environment



Vent-A-Roof passed a 177 kph Wind Driven Rain Test with flawless results

Avoids combustion and heat build-up from electrical heating/cooling appliances and in storage and chemical facilities

Form 15 Certification (fully certified)

Can be used Australia wide

A preventative solution for Sick Building Syndrome

BAL 12.5 – 40 Compliance (bushfire attack level)

Cyclone rated Australia wide

Rated for all wind categories in Australia: A, B, C and D

Compliant with 2019 NCC requirements pertaining to condensation management and energy efficiency

Exceeds Australian standards in condensation management



Decreases energy consumption from electrical cooling/heating appliances by removing stagnant air

Extends the life of the building – natural air circulation

Reduces maintenance costs with no moving parts

Alternative to Costly Industrial vents


Cost Comparison

Whirlybird: $180-$300 fully installed
Vent-A-Roof™: $50 – $250 fully installed
2.5m ridge – airflow equivalent of 1 whirlybird
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