Charlotte, North Carolina has a lot of direct sunlight all year around. The element that damages wood decks is actually sun more than rain. We have found that by pressure-washing your deck thoroughly and then applying a good quality stain (like a Cabot Stain), protects the deck from twisting, cupping, and splitting and can prolong the life of the deck for a very long time.
A deck maintenance program would be a very good idea to protect your investment of a wood deck. Each year for the past 3 years, Remodeling Magazine has listed a wood deck as one of the highest return on investments (ROI). It only makes sense to protect the investment with a good deck maintenance program that will treat your deck every year and check it for structural integrity and any splintering or warping. Check out Value Remodelers (http://www.valueremodelers.com) or Archadeck of Charlotte (http://charlotte.archadeck.com) to inquire about these type of programs!