What I did that worked really well for me but was not for a sulcatta was; I first put down 1 by 2's on the concrete every 16", then I covered the whole pen with compressed foam board with the foil backing on both sides(1" thick) The foam went on top of the 1 by 2. Then I put down 1/8 thick masonite over the foam board. Finally I layed a pond liner over the whole thing and 12" up all the walls(actually up the studs, then I used 1/2 plywood as the walls over the pond liner). I used sand/soil also as the substrate, if you put enough in I suppose they wont make it down to the pond liner to damage it(like I said mine wasnt for sulcattas,but the liner will hold up quite well to them). If you are worried about the liner being damaged by them you can add another layer of the 1/8 masonite inside the liner before you fill it with the substrate. I would stick to the sand/soil combo though, it works the best. Good luck

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