Roof ventilation systems are designed to drive heat and moisture out of your roof cavity, keeping your home cooler in summer and helping prevent mould, mildew and dry rot. Rotary roof vents or whirlybirds are the most common ventilation systems for Australian homeowners. At Classic Roofing, we can advise on the right roof ventilation products for your home, help you plan where on the roofline they’ll do their best work, quote the job for you, then supply and install.