If it is not structural then why not just us vinyl flooring or vinyl wall paneling? Or 3mm Rubber floor mat. if the coop is small enough maybe an office chair mat.My current coop floor is made of pine lumber, 1" x 4" boards (treated with wood preservative). Due to the lumber quality, some boards being slightly bent etc. there are some gaps between them.
Tiny pieces of wood chips fall between the gaps and so I have to refill wood chips more often and remove the accumulated mess below (the coop is standing on concrete deck blocks and there is some space underneath).
Just thinking out loud what would be the best way to fix this? Cover the pine boards with thin plywood (since plywood here wouldn't be structural)? I hear rubber mats are not great for coops.
Thanks!