My husband bought the roll insulation(the pink stuff) and then covered it with plywood.The floor is spruce and the cracks fill with shavings except in the summer when we can wash it completely and the water will drain through the cracks. The building came with vents up high. We put an electical receptical in and run a heavy duty cord across the ground to it. I did use a red heat lamp last winter when it got quite cold. We put wire, then felt, then lattice work for looks along the outside bottom of the coop. We have 2 medium size doggie doors, 1 leads to the large covered pen, the other out by the front door. I plug in a base water heater under the metal water cans. Hey, chickenboy, You must shop at blueSeal? There is also a good place in Buxton. Longhorns. They have some unusual stuff. I like Blue Seal grain and go to Windham often. I've been to Pittston also. Quite a long time ago. I go up the turnpike up to Bangor occasionally so go right near there too. It IS alot colder up there than down here! Merry