I first want to state that I am not trying to disrespect life long chicken owners or anyone that has built there own coop and run and called it predator proof. So please don't take anything I say as an attack or as me trying to one up. I have started this thread now because I'm gearing up for a chicken coop and run build that will start this weekend. This will be the first full length thread build I have ever done and I ask that you be patient with me as it will most certainly take longer then expected and turn out different in the end then the original plan, because....... well.... that's how I build I am by no means an expert builder and my experience is all self taught so if you are looking for square and perfect then this won't be it. I started my research about 4 months ago. I was one of those people who has wanted chickens, got a mail ordered coop and run tractor and got chickens that were young, thought (there is no way in hell these guys will out grow this) then reality struck and realized if I was going to keep them I better think long term cause that was not it. I am very particular with certain things and protecting my girls is my number one goal in this build. Luckily we don't have to be concerned with bears here in the city so please keep in mind if you do, this wouldn't be built to withstand that kind of abuse. But this should keep out anything else smaller then that. This first post is the concept post, there will be no building pictures because... well I haven't started yet. However , I will post one or two pics of ideas as I am a visual person and prefer pics to display thought. Materials for run ( as this is the primary reason for this post): 2"x2"x Whatever you wish 2"x4"x whatever you wish 4"x6"x whatever you wish 1/2" hardwire mesh Thick patio tile Heaver duty hammer in staple/wire fasteners Corrugated roofing Nails, Screws, drill bits, etc. I have read through many areas about preventing digging underneath. At first I had planned to dig my entire run's ground down 2-3' and laying my underwire down there, but the thought of that exhausted me. I'd first either need a sprinkler and turn it on several times a day for multiple days to soften the ground (cause keep in mind I'm not on a farm and only have a shovel and no access for big equipment) or wait for a lucky weeks worth of rain. then I got to thinking... why?... why do I need to dig down that far? Why not just concrete the base and build up like a raised garden bed. That would prevent anything digging in from underneath. But then you will have a drainage issue, which we all know is never good with chickens. so I thought long and hard about this issue and stewed over it and came across a post of someone who was much smarter. They dug down about 6" and leveled the ground and then used patio tiles as the base and raised up the sides of the run with 4x4s to give it the raised bed look and gave enough space for sand or mulch or whatever your choice is. I thought that was genius so I have added to it, but of course tweaked it and I will dig 6" and level and then put about 2-3" of finely crushed gravel, level and then place my 1/2" hardware cloth wire over (why 1/2" hard ware wire on the bottom instead of chicken wire? because mice dig and will tunnel through and then you have a nice entrance for snakes seeking out mice), weed barrier and then place the patio tiles. This will ensure good drainage so that the wire does not rust out with a year or so and become useless and this will also be easier to level and pack for the tiles. I will lay the wire out about 1 1/2' out past the tile to still protect for predators trying to dig under only because I don't want my foundation to become unstable from rodent tunnels or even larger tunnels for past attempts. I will then lay my 4"x4" post around the border and rebar those into place. You now have a Fort Knox chicken run bottom. Reference pics below ( These are not my build but an example of what I am planning on doing) Dig 6" and fill 2-3" crushed rock Add 1/2" hard ware cloth wire then the tile ( not the same set up, different pic but you get the idea) Then add your weed barrier ( to insure you don't get deep rooted plants growing up which will make your life a living hell after the build) and add your wood border to give you room to fill with run gravel/sand/mulch, and I also like to have a solid foundation since the run will be paneled. This will be the end of Part 1 of my build. When I start catching up to this step i'll have my own pics and i'll dive into the next steps. Thank you for taking the time to view my thread and if you have suggestions please add them below.