Day lighting the roof with glass tiles worked for me but who knows how possums react to different situations.
Possum lifting roof tiles.
The first step to getting rid of possums from inside your ceiling is find out how they are getting into your home.
Possums are quite energetic especially the brushtail meaning that they can lift a roof tile easily when searching for a place to live.
A neighbour installed internal chicken wire panels between the joists so even lifting tiles would not gain them entry.
You can do this by checking gaps of sunlight in the ceiling.
Possums can find many different ways to enter your roof or walls.
This will usually be under the eaves or through a gap under your tiles.
A possum can find its way into your roof space through a multitude of spots.
Use possum deterrents e g.
Firstly clench your fist and this will demonstrate the minimum size a possum will need to be able to force itself through a gap.
Here we see a possum gain entry into a roof via moving some lead flashing.
Build a possum box.
Possums are often able to lift tiles so this needs some attention if your roof is tiled.
Examine the ceiling to check for holes they might have used to make their way in.
Trap the possums and seal up entry points.
Sprays spikes and spotlights.
Disinfect and repair roof tiles.
Possums will only be on your roof regularly for three reasons they are living in your roof they are living on your roof or they are using your roof to get from a to b.
Ensure that the possums are not sleeping inside and have the damaged area repaired.