Whirlybird Installation

A whirlybird (or turbine ventilator) is a passive roof ventilation device consisting of a series of vanes arranged in a cylindrical turbine head mounted on a base flange. When wind passes across the vanes, the turbine spins, creating a low-pressure zone that draws air upward and out of the roof space through the cylindrical opening. Even a light breeze of 8-10 km/h is sufficient to activate the turbine, and in stronger winds the extraction rate increases proportionally. Installation involves marking the desired location on the roof (typically near the ridge for maximum effectiveness), cutting a circular hole through the roof sheet or tiles, fitting the base flange with appropriate sealing and flashing, and mounting the turbine head. The base flange must be properly waterproofed, with sealant and an overlapping flashing arrangement that prevents water from entering around the penetration. On tile roofs, a tile adaptor plate is used to bridge the gap between tiles. In Gippsland, whirlybirds are particularly beneficial for reducing summer heat build-up in roof spaces and managing condensation during the cooler months. A single whirlybird can ventilate approximately 100 square metres of roof space. Town & Country Roofing installs quality stainless-steel whirlybirds as a standalone service or as part of a roof replacement, ensuring each unit is correctly positioned and sealed for optimal ventilation performance.