Oh Mr. NoShoulders, know him well...You'll need to go higher than 2 ft to keep the snakes out. Keep the grass short, leaves, brush/ornamentals, compost piles as far away from your runs as possible. Too, Timber and Copperheads both have a camouflage that blend in very well with these things too making them difficult to spot. Don't leave any feed available for rodents. 1/2" mesh is good for making snake traps. The skin of 6 ft Canebreak, 17 rattles and a buttons pinned to the wall is my reminder to be vigilant. Dispatched a small one a few days ago outside the coop with a box full of poults in my lap. Be careful.