Crown Roofers Sydney
Whirlybirds & Roof Ventilation Sydney
Roof ventilation sized and positioned properly — one vent per 50 m² of roof, high, with matching intake at the eaves.
Why Choose Us
Whirlybirds & Roof Ventilation You Can Trust
Sized to the roof
One vent per 50 m², not a number picked at random.
Intake as well as exhaust
Vents without eave intake achieve very little.
Honest assessment
If what you have is working, we say so.
Warning Signs
Signs You Need Whirlybirds & Roof Ventilation
Don't ignore these warning signs — small issues left untreated almost always turn into costly repairs. If you notice any of the following, contact us for a free inspection.
An unventilated Sydney roof cavity gets extraordinarily hot. In the west it will sit at 60-70°C through a February afternoon, which cooks the ceiling insulation, pushes heat down into the rooms below and drives your cooling costs up. In winter the same cavity traps moisture, and that is where ceiling mould starts.
Ventilation fixes both, but only if it is sized and placed correctly. The rule we work to is one whirlybird or ridge vent per 50 m² of roof area, positioned high on the ridge with matching intake at the eaves — air has to come in somewhere for anything to leave. Undersized or badly positioned units are the most common thing we find already installed.
If your existing setup is adequate, we will tell you that rather than sell you more of them.
All work is carried out under NSW Building Licence 471250C, covered by $20M public liability and backed by our 10-year workmanship guarantee.
Common Questions
Whirlybirds & Roof Ventilation FAQs
How many whirlybirds do I need?
Roughly one per 50 m² of roof area. Two units on a large roof with no eave intake will underperform badly, which is a very common setup.
Do whirlybirds actually work?
Correctly sized and placed with adequate intake, yes, measurably. Undersized or without intake, they largely spin without moving much air.
Will it leak?
Not when flashed properly — the flashing is the part that matters, as with any roof penetration.
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Whirlybirds & Roof Ventilation in your suburb
We service every suburb across Greater Sydney. Pick your area below for local pricing, availability, and photos of recent work nearby.
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Get a free, no-obligation site inspection and written quote from our licensed team. We cover all of Greater Sydney and confirm the agreed scope in writing before work begins.
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