Possums are a common part of urban life in Melbourne, but when they move into roof spaces, they can cause significant disturbance and damage. While the instinct for many property owners is to trap and relocate these native animals, this approach is often stressful for the animal and ineffective long-term. Humane exclusion, using one-way doors and providing alternative shelter with nest boxes, offers a practical solution that resolves the issue without causing harm to local animals.

Understanding Humane Exclusion

Trapping native animals are subject to strict native species protection requirements. Even when moved, relocated possums face high mortality rates due to territorial conflicts in new areas. Exclusion focuses on allowing the animal to leave the building of its own accord and preventing it from reentering, which is far more humane and achieves lasting results.

How One-Way Doors Work

A one-way exit door is a temporary device installed over the animal's primary entry point into the roof space. Here is the process for using them:

• Seal Secondary Openings: Before installing the door, all other potential entry points around the roofline must be sealed using timber, metal mesh, or flashing.
• Install the Exit Gate: The one-way door allows the possum to push its way out at night but prevents the gate from opening inward when they return.
• Monitor Activity: Once the scratching sounds stop, the door can be removed, and the final entry gap is sealed.

Providing alternative shelter: Nest Boxes

When a possum is excluded from a roof, it loses its nesting site. To prevent it from trying to scratch its way back in or finding a gap in a neighbor's roof, installing a timber nest box in a nearby tree is highly recommended. Mount the box at least four meters high in a secure position. This provides the animal with an immediate alternative home, keeping them in their local territory while keeping your roof cavity clear.

Securing the Building

Completing the proofing work involves checking the entire structure. Check the fascia boards, valleys, eave vents, and tile lines to make sure no gaps remain. Keeping tree branches trimmed back from the roofline also limits the physical pathways possums can use to reach your home. A professional technician can assess the property, install the one-way system, and place the nest box safely.