My train room is attached to the house, on a slab. Moisture barrier under the slab, sealed the slab, and have moisture barrier under the carpet underlayment. I just have the Frigidaire dehumidifier for safe measures. I keep it set at 50% on low. Room is comfortable, no problems have occurred. I keep a small piece of clean raw steel leaning against a wall on the other side of the layout where no one but me knows it’s there.....that’s my sacrificial test anoid. So far, it’s still clean. No signs of corrosion or staining....so that’s my test...I’m good to go.........Pat
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