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I didn't use anything on the bottom of the run, or coop. We don't have any predator problems where these guys are parked. I don't think the roof weighs even 20 lbs. Most of the wieght comes from the framing, which will get lighter as the lumber dries out. The metal is only 31 gauge, so it's very light. You could swap it out for 3/8 plywood and probably add less than 50 lbs.