All, I'm partway through our coop build, a stacked henhouse over a fenced run that is being designed to accommodate deep litter. I have a few urgent questions about this as I attempt to finish things and get our girls moved in, which we hope to do tonight: 1. Bottom line up front: how do I prepare the plywood surfaces of the henhouse if using deep litter, to maximize longevity of the structure? The details: the henhouse is a 1/2" plywood box design on 2x4s. The box is built (see attached photo), roof is mostly done, but the insides are not yet done. Cutouts at 12" above the floor have been incorporated for the laying box and chicken exit, to accommodate the foot deep bedding used for the deep litter method, and then another hatch is cut lower that will be opened to clean out the composted bedding bi-annually / annually. Not all doors and windows are in yet, we're cutting those in next. Since we will have this damp mess of bedding year-round with the DL method, do I want to line the plywood floor with something? If so, what? Should I use a spare pond liner (heavy duty rubber sheet) that we have? Should we put down linoleum, or something else specific? Do I drill holes in the floor to allow bits or fluids to drop through? I don't know if I need it waterproofed or performated on the bottom and sides, to prevent rotting of the wood. 2. I have heard that the use of diatomaceous earth is no good for the deep litter method to prevent killing off beneficial microorganisms, which makes sense. But can I use DE in a separate dirt bath station underneath the henhouse, in the fenced in run? In the absence of guidance, I was going to use a mix of DE, sand, ash from my charcoal grill, and topsoil. 3. What kind of ground material is preferred for that run area at the base of the structure? Just leave it as dirt, put in some mulch, bring in gravel? This year is a test run and if we love the placement and design of the coop, I will pour a pad next year and anchor it down. But for now, what's the best flooring on which the coop will sit, both for longevity of the wood (only the bottom rectangle is pressure-treated, the rest regular pine) and for the chickens' enjoyment?