This is all about escape and intruder prevention. Probably the worst thing that a bird owner can experience is having a bird killed by a predator or one that escaped from its cage. You can prevent this scenario through some sensible precautions.
You can ensure the safety of your birds by getting the netting or mesh that’s of the correct size in relation to the size of the birds that you’re intending to keep. The birds shouldn’t be able to chew through the holes as well. If you have smaller birds like budgies and finches, then you need to double check as they can fit through the gaps of aviaries.
When you’re choosing a wire mesh, a safe material is iron, aluminum or stainless steel. You should never opt for galvanized steel as it contains zinc, a mineral that is poisonous most especially to large birds. If you have no choice but to use galvanized steel, it will be safer if the steel is galvanized after it is welded.
If you have foxes and other animals in your area that may try to dig under the enclosure, then consider using a floor made of concrete.
You should also consider trimming nearby trees as predators may gain access through the aviary’s roof. However, you need to leave a bit of shade so the birds don’t get direct sun exposure during sunny days. You can also use a fogging system during the summer season to keep your pets cool.
Unlike a single door entrance, having a two-door entrance will ensure your aviary is sealed around the clock. No bird will be able to escape even when a careless person enters the enclosure. Of course, you need to lock the aviary if you are not around to look after it.