My coop has only a solid roof, everything else is wire. The climate here is very hot and humid, it very seldom does it go below freezing in the winter. This year we might have had 15 hours below 32 and then none less than 28 degrees fahrenheit.
The flock is comprised of big girls- Buff Orps. and Barred Rocks, the heat is what I worry about with them.
My coop is 4' off of the ground and the poop for the most part does fall through, The floor has to be hosed down about 3X per week to prevent "build ups." My girls cannot go under the coop so it is used as a composting area for my gardens. The nest boxes are lined with shredded paper that I change out once a week, with the used paper
being spread out over the droppings.
The wire works well for me, as the hardware cloth is strong enough to hold up to 8-9lb Buff's jumping down from their roosting boards without pulling loose.
Carbon (shredded paper)+Nitrogen(poop)+heat (free)+water( floor cleaning)= good fast compost.