Rural Gardening: Let's see your coop!, 1 by Gwendalou

Gwendalou wrote:
I'll be watching this! We have a 'summer' coop for the girls and are having their winter digs delivered on Saturday. This is their summer coop. It has a fenced run.

Last winter we moved this to their winter area and put poultry fencing around. I didn't want to move this around anymore so it's staying put from now on and I bought a small shed to convert into a coop. I'm going to try letting them completely free range. If they do too much damage or spend too much time pooping on the porch, then I'll put the poultry netting back up. But they have quite a large area of grass and woods that I'm hoping they'll stay away from the house.

What is the stuff I need to get to put on the floor of the new coop to make it easy to clean out? Some sort of smooth surfaced board of something? I forget what it's called. I need to call around and find some before Saturday.