Why install a Whirly Bird ?
During Sydney’s warmer months, considerable heat can build up inside a poorly ventilated roof cavity. Moisture and condensation may also accumulate during cooler or humid conditions.
Proper roof ventilation can help:
-
Release trapped hot air from the roof cavity
-
Improve airflow throughout the roof space
-
Reduce moisture and condensation
-
Protect roof timbers and insulation from excessive moisture
-
Reduce the workload on air conditioning in some homes
-
Make the roof cavity less hot when maintenance is required
Roof ventilation works best when the roof also has suitable points for replacement air to enter.
Traditional Whirlybirds
Traditional whirlybirds use wind to rotate the turbine and draw warm, stale air from the roof cavity. Rising hot air can also escape naturally through the ventilator.
Benefits of traditional whirlybirds
-
No electricity required
-
No ongoing running costs
-
Simple and proven design
-
Generally more affordable to install
-
Available in colours to complement many roofs
-
Suitable for metal and tiled roofs
-
Can continue providing passive ventilation without direct sunlight
Their performance varies depending on wind conditions, roof design and the amount of replacement air entering the roof cavity.
Suggested image alt text: Traditional whirlybird installed on a Colorbond roof in South West Sydney.
Solar Roof Ventilators
Solar roof ventilators use a small solar panel to power an electric fan. The fan actively removes hot air while sufficient sunlight is available.
Benefits of solar roof ventilation
-
Provides powered extraction during sunny conditions
-
Moves more air than many individual traditional whirlybirds
-
No connection to household electricity is normally required
-
No ongoing electricity costs
-
Low-profile modern appearance
-
Particularly useful during hot, sunny Sydney weather
Solar units generally cost more upfront and their performance depends on sunlight, product quality and positioning.
Frequently Asked Questions
How much does whirlybird installation cost?
Installation costs depend on the type of ventilator, roof material, roof height, access and the number of units required. Contact us for a quote based on your roof.
Are solar roof ventilators better than traditional whirlybirds?
Solar ventilators generally provide stronger powered extraction during sunny conditions. Traditional whirlybirds are more affordable and provide passive ventilation without relying on direct sunlight.
How many whirlybirds does my house need?
The appropriate number depends on the roof size, design, insulation and available intake airflow. We can inspect your roof and recommend a suitable arrangement.
Can whirlybirds be installed on tiled and Colorbond roofs?
Yes. Traditional and solar roof ventilators can be installed on many tiled and metal roofs using suitable flashings and installation methods.
Do whirlybirds help cool a house?
They can reduce trapped heat inside the roof cavity. However, results inside the living area vary depending on insulation, ceiling sealing, roof design and ventilation intake.