Regarding the deep litter method - my understanding of it is that it is really a method meant for an area with a dirt floor so that composting goes on. Otherwise, it might not be so sanitary. So,if you have a cement floor, there wouldn't be anything beneficial, necessarily, to do the work of breaking down the nasty stuff and it would just breed disease. Just my two cents...
I really need to say that my experience supports this. Deep litter on the cement floor was yucky. Over the dirt floor pen, works great.