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our coop has a big concrete courtyard that I would like to fill in with Trex decking. I was planning on just laying down some strips of the Trex as the undercarriage. But to avoid having the deck rise up too high and get interfere with door swings, etc.. I am thinking of just laying the undercarriage strips flat-side down. This would mean there would be about an inch of space under the deck. Is this okay in terms of ventilation?