Annie,
Never under estimate the abilities of a predator when there is a easy meal to be had. I am assuming the outside walls are wood. A coon, possom, weasel, mink can easy climb up a wooden building to get in. Keep in mind they climb trees.
I just don't want you to have the experience of going out in the morning and find dead chickens.
I had a coop that was metal and I had a coon climb up the tin somehow and get in a eave opening and kill about 6 of my hens. I would secure it somehow. I stapled (good strong thick staples) hardware cloth on mine and never had another problem.
Never under estimate the abilities of a predator when there is a easy meal to be had. I am assuming the outside walls are wood. A coon, possom, weasel, mink can easy climb up a wooden building to get in. Keep in mind they climb trees.
I just don't want you to have the experience of going out in the morning and find dead chickens.
I had a coop that was metal and I had a coon climb up the tin somehow and get in a eave opening and kill about 6 of my hens. I would secure it somehow. I stapled (good strong thick staples) hardware cloth on mine and never had another problem.