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I need to somehow stop animals such as possums and rats climbing into the roof space. I assume the gaps are there to allow airflow. How do I stop the animals and allow the air?
Good afternoon @Greg56
Welcome to the Bunnings community page 
I can think of a few options you could consider.
1- Spiky strips for pidgons (may be hard to fasten to the timber)
2- Small chicken wire in rolled up sections and wedged in. (Like this one the most for ease of use and blending in)
3 - There are courrogated insulation strips you can purchase but they usually are short in height.
If you roll the chicken wire mesh/bird mesh tight abound say a rolling pin a few turns there shouldnt be a lot of space for rast to get through either.
Dave
Hello @Greg56
Allow me to welcome you as well to the Bunnings Workshop community. It's wonderful to have you join us and thank you for sharing your question about sealing the gaps under your eaves.
It's great that you've received excellent advice from @Dave-1. Just to add to the suggestions made, I recommend using 18 x 18mm 5.4m H3 Treated Pine FJ DAR Primed LOSP to build a custom rectangular cover to fit into the gap of your eave. I've sketched up a sample below to give you an idea of how it can be put together.
I propose using Saxon 90cm x 3 x 0.7mm x 5m Animal Wire Netting and using a staple gun to fix it to the timber frame. You can mount the frame by drilling it into the side of the timber rafters. Please note that the measurements are for reference only, please adjust them to your needs.
If you need further assistance, please let us know.
Eric
