I built my coop floor so that the boards do not completely touch each other, for easy cleaning and ventilation during our hot/humid months. My thought was to cover the floor during the winter to reduce drafts (they have other ventilation) I put a rubber mat on the floor (easy clean-up) but the girls stopped going in their coop at night. I even found them on their outside roost in the pouring rain! I removed the mat and they are back in (mostly). Do they not like change? Do they not like the feel of the rubber? Am I worrying too much about drafts?