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Frequently Asked Questions | FAQ

Do Whirlybirds Work?

Yes, whirlybirds do work to allow the hot air and moisture trapped within your roof cavity to escape naturally. Whirlybirds also provide a high level of air quality for your home by preventing the build up of any fumes, stale air or damaging condensation. Whirlybirds are essentially designed to cover and protect a hole in your roof. Hot air and moisture can rise up and escape through a whirlybird – whilst the whirlybird turbine and flashings prevents any rain water from entering the roof.

Do Whirlybirds Lower Temperature?

It is difficult to say whether or not whirlybirds or even powered roof vents will lower the temperature of your home.

The general rule of thumb for roof ventilation is that 35% of the heat in your home comes through the roof – and with the installation of roof vents we are simply trying to exhaust some of that hot air trapped within the roof cavity in order to combat and reduce that 35%.

However it is difficult to calculate exactly what effect roof ventilation will have for your home as each home is designed and built differently. It is very much dependent on what is actually causing the build up of heat in your home. This is something an architect or energy consultant would usually advise on.

As we are just a roofing company, our recommendations are simply based on the manufacturer’s recommendations.

Do I Need an Electrician to Install my Mains Powered Roof Vents?

No, our Mains Powered Roof Vent pricing already includes the connection of your vents by a Licenced Electrician. Our Licenced Electrician will install a 240 Volt AC electrical socket within 1.5m of your AiroMatic roof vents. This allows for the power supply of your AiroMatic roof vents to be plugged directly into mains power.

If you would like the option to turn your AiroMatic roof vents on and off from a wall mounted electrical switch, you will need to organise this yourself through your own electrician.

Where Can Whirlybirds be Positioned on a Roof?

Whirlybirds are generally positioned at the very top of a roof along the highest ridge line. This positioning allows whirlybirds to work most effectively, as hot air and moisture will naturally rise and accumulate at the highest point of a roof, where it can escape through the whirlybirds and in to the environment.

However whirlybirds can be installed anywhere on a roof. If you have a particularly problematic area of your home that requires ventilation, you can install a whirlybird on the roof directly above this area. For tiled rooves, this is not a problem at all. However with metal rooves, an additional dry pan flashing is required to protect and prevent water from penetrating under the upper edge of the whirlybird base.

Where Should Whirlybirds be Positioned on My Roof?

We try to position the whirlybirds on the rear aspect of your roof as much as possible in order to preserve the aesthetics of your home and maintain its natural street view. Our tradesmen are all experienced roofers who are skilled at finding the best possible locations for your whirlybirds.

However we can position the whirlybirds wherever you would like them. We use satellite imagery of your roof to plan positioning prior to installation. And our tradesman are more than happy to discuss all the possible locations with you on the day.

If you would like your whirlybirds positioned in a location other than at the very top of the roof, some further considerations may be necessary. For tiled rooves, this is not a problem at all. However metal rooves will require the installation of additional dry pan flashings to protect and prevent water from penetrating under the upper edge of the whirlybird bases.

Do Eave Vents Make Whirlybirds More Effective?

Yes eave vents do make whirlybirds more effective. Eave vents are essentially like intake valves, allowing cool fresh air to be drawn in through the eaves at the bottom of the roof. This increases the flow rate of air throughout the roof cavity and also increases the exhaust rate of hot air through the whirlybirds at the top of the roof. The minimum number of eave vents recommended by the whirlybird manufacturer is 4 per roof vent.

Are Ceiling Vents Necessary?

Ceiling vents allow hot air, fumes and moisture to be drawn up through your ceilings and in to the roof cavity, where it can be exhausted in to the environment by powered roof vents. We recommend one Ceiling Vent per powered roof ventilator, placed directly below the powered roof vent in order to achieve maximum effectiveness. (Please note that ceiling vents are NOT normally recommended or compatible with air conditioning.) We currently offer two types of ceiling vents – a circular always Open Ceiling Vent and a square Closeable Ceiling Vent. The square Closeable Ceiling Vents are useful for controlling the flow of air internally, particularly desirable during the change of seasons from Summer heat to Winter cool.

Do we Replace Noisy or Seized Whirlybirds?

Yes we do replace noisy or seized whirlybirds, however please contact our office for an estimate on how soon we can attend onsite.

Generally whirlybirds are installed in pairs and when one whirlybird starts to go, the other one isn’t far away. Standard residential whirlybirds have an average life span of between 10 and 15 years (the CSR Edmonds Windmaster Whirlybirds we install come with a 15 year parts warranty). So when it comes to replacing whirlybirds that have failed due to old age, we always recommend replacing both of them at the same time – as it is 25-30% cheaper for you to replace both whirlybirds, compared to replacing one whirlybird now and the other one down the track.

Can Whirlybirds be Repaired?

Yes whirlybirds can be repaired. The most common cause of whirlybird failure is for the bearings to rust or seize. This can result in the whirlybird turbine making noise, slowing down or prevent it from spinning all together. Replacement whirlybird bearings can be purchased separately – by simply looking up the manufacturer’s data sheet and searching for the listed bearings on the internet.

However we do not recommend whirlybird repairs. We found that when repairing whirlybirds in the past, further issues would always seem to arise resulting in additional call outs and costs. As such, we simply recomend replacing the entire whirlybird unit. This not only saves money (by preventing unnecessary call out fees) but ensures your whirlybirds are brand new and completely problem free. We also guarantee peace of mind with our 15 year parts and labour warranty.


Do we Provide a Warranty on our Whirlybird Installations?

Yes we provide a 15 year parts and labour warranty on all our whirlybird installations. We use CSR Edmonds Windmaster Whirlybirds as standard for all installations – the best quality whirlybirds available on the Australian market.