What we have found is that decks that are maintained once every 12 months to 18 months are comparatively easy to bring back to life. When things get tough is after several years of neglect or when rot sets in. Such boards are weak and can be dangerous. Nail pops are next. They are unsightly and can damage little feet.
Wood rot is another item to watch.
It can go unnoticed. Whether it's a handrail or a deck board, twisted, bowed and cupped lumber can make things look terrible. Finally, horrendous gaps at joints and connections can make your wood deck look as though amateurs built it. Split pieces of lumber and those that are cupped or twisted usually need to be replaced. We find that cutting the bad piece in half or thirds makes it easier to remove.