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Installing a whirlybird on a metal roof may seem like a daunting task, but with the right knowledge and tools, it can be a straightforward DIY project. In this guide, we will walk you through the step-by-step process of installing a whirlybird on a metal roof. From the equipment you’ll need to the precise installation techniques, we’ve got you covered. So let’s get started and help you create a well-ventilated and energy-efficient space!

Understanding the Benefits of a Whirlybird Ventilation System

Before delving into the installation process, it’s important to understand why installing a whirlybird on your metal roof is beneficial. A whirlybird, also known as a wind turbine ventilator, is a roof vent that harnesses the natural power of the wind to create airflow and expel hot air from your attic or building. Here are some key benefits of installing a whirlybird:

    • Improved Ventilation: Whirlybirds promote proper air circulation, preventing the buildup of heat and moisture in your attic or building.

    • Energy Efficiency: By reducing heat buildup, whirlybirds can help lower your cooling costs and make your space more energy-efficient.

    • Extended Roof Lifespan: Adequate ventilation helps regulate temperature and moisture levels, which can extend the lifespan of your metal roof.

    • Reduced Condensation: Whirlybirds can help prevent condensation and mould growth by expelling excess moisture from your space.

    • Environmentally Friendly: Whirlybirds operate solely on wind power, making them an eco-friendly ventilation option.

Essential Equipment for Whirlybird Installation

Before you start the installation process, gather the necessary equipment to ensure a smooth and efficient installation. Here’s a list of items you’ll need:

    • Ladder or other means of accessing the roof

    • Battery drill or drilling machine with an extension cable

    • Marking pen

    • Angle grinder or tin snips for cutting the roof sheet

    • Socket to drive 5 mm Tek screws (commonly 8mm hex)

    • Additional flashing if not using a ridge cap position fitment

    • Tek screws (5mm diameter x 20mm long) and sealing washers

    • Safety gloves and goggles for protection

Choosing the Right Position for Your Whirlybird

Before you begin the installation, it’s crucial to determine the optimal position for your whirlybird. The ideal location is under the ridge capping, as this allows for maximum airflow and ventilation. Follow these steps to choose the right position:

    • Mark the Ridge Cap: Use a marking pen to indicate the positions where you plan to fit the base plates. Remove the fasteners holding the ridge cap in these positions.

    • Install the Base Plates: Push the base plates under the ridge cap and line them up carefully. Mark the position where you’ll need to cut the hole for installation.

    • Cut the Hole: Use an angle grinder or tin snips to cut the hole in the marked position. Take your time and ensure a clean and precise cut.

Fitting the Trim Ring (Optional)

If you choose to use a trim ring for added protection and aesthetics, follow these steps to fit it:

    • Prepare the Trim Ring: Take your trim ring and ensure it is slightly larger than the hole you’ve cut. If necessary, cut the trim ring in one place to fit it through the hole.

    • Insert the Trim Ring: Lift the trim ring through the hole using a piece of string or feed it through the hole with a string attached. Hold the trim ring in place and attach it from the outside using Tek screws and sealing washers.

    • Secure the Trim Ring: Use at least four screws to secure the trim ring to the roof, ensuring a tight and watertight fit.

Installing the Base Plate

Now that the hole and trim ring (if applicable) are in place, it’s time to install the base plate. Follow these steps:

    • Position the Base Plate: Place the base plate on top of the roof, aligning it with the hole and trim ring. Ensure that it is centred and level.

    • Fasten the Base Plate: Use Tek screws and sealing washers to fasten the base plate onto the ridges of your metal roof. Make sure to replace the fasteners holding the ridge cap as well.

    • Check for Stability: Ensure that the base plate is securely attached and does not wobble or move. This will provide a stable foundation for the whirlybird installation.

Installing the Whirlybird

With the base plate securely in place, it’s time to install the whirlybird. Follow these steps to complete the installation:

    • Attach the Whirlybird: Place the whirlybird on the spigot of the base plate, ensuring a snug fit.

    • Adjust the Position: Rotate the two halves of the neck to adjust the unit so that the rotor (lid) is horizontal. Use a spirit level to ensure the whirlybird is level and balanced.

    • Secure the Whirlybird: Once you’re satisfied with the position, use tek screws to secure the whirlybird to the base plate and the securing strips.

Final Checks and Maintenance Tips

Now that your whirlybird is installed, it’s essential to perform some final checks and follow maintenance tips to ensure optimal performance:

    • Check for Proper Functioning: After the installation, ensure that the whirlybird spins freely and smoothly when exposed to wind. This indicates that it’s functioning correctly.

    • Monitor and Clean Regularly: Periodically check the whirlybird for any debris or dirt buildup. Clean it if necessary to maintain its efficiency.

    • Inspect for Wear and Tear: Keep an eye out for any signs of damage or wear, such as loose screws or rust. Replace any worn-out parts to ensure the whirlybird’s longevity.

    • Consider Seasonal Adjustments: In certain climates, it may be beneficial to adjust the whirlybird’s position or use additional units during different seasons to optimise ventilation.


Installing a whirlybird on a metal roof is a practical way to improve ventilation, reduce energy costs, and extend the lifespan of your roof. By following the step-by-step guide outlined in this article, you can confidently tackle the installation process yourself. Remember to prioritise safety and perform regular maintenance to keep your whirlybird functioning optimally. Enjoy the benefits of a well-ventilated and energy-efficient space!

For professional roofing services in Newcastle, Australia, including roof repair, metal roofing, roof restoration, and guttering, visit Newcastle Roofers.