Well, you could place concrete blocks or pavers in each corner and a couple in the middle of the coop. Then frame out a real floor atop them using dimensional lumber (2x4s or 2x6s). Then cover that with plywood. As long as you made the floor joists close enough and supported it evenly with the blocks it would be plenty sturdy enough.
If you are looking for a quick and cheap way, you could always just lay down pallets directly on the dirt floor and lay some plywood sheets over that.
If you are looking for a quick and cheap way, you could always just lay down pallets directly on the dirt floor and lay some plywood sheets over that.
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