To figure out what humidity effects there are actually current, you need to know the drying system itself. Most fences are crafted with strain dealt with wood. You might have posts with the body, 4x4s and 2x4s and 1x4s or 1x6s with the pickets. Provide the deck a visible inspection, https://deckstainingcontractorspi02467.ageeksblog.com/1714515/how-how-long-to-let-deck-dry-before-staining-can-save-you-time-stress-and-money