Sand in the coop needs daily cleanup, and will get hard in freezing weather. LABOR INTENSIVE! Deep litter gives the birds stuff to scratch in, requires occasional additions of more shavings, and cleanout to the garden maybe twice each year. Poop boards are also daily cleanup, ugh! Easy is always better, IMO. Don't add another ceiling, enjoy the space you have. Some of my birds roost in the rafters, eight feet up! Think ventilation, so lots of hardware cloth and openings rather than closing things. Mary