Unfortunately when this happens the only solution is to remove the debris which may involve climbing onto the roof.
Roof turbine noise.
Our spinning rooftop turbine vents were squeaking and squealing in the wind.
I am guessing that by whirlybird you refer to a turbine type roof exhaust vent that is spun by wind.
Our spinning rooftop turbine vents were squeaking and squealing in the wind.
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Those are rather silent.
Over time these vents can become squeaky from moisture and age related natural degradation.
On 2019 01 05 by 007flight.
I climbed up to the roof to quiet them down with a long lasting wd 40 specialist product.
Designed to maintain steady ventilation to attics these devices are necessary to prevent mold and excessive heat buildup under the roof.
There are other less common causes of a squeaking roof turbine such as debris getting stuck in the fins.
This can sometimes create a whistling noise as the turbine rotates.
Turbine vents are those ubiquitous devices found on almost every residential rooftop.