Composite Decking 101ContentsFlatten Joists To Keep Away From A Wavy DeckDeckingStraighten Out Cupped Or Warped BoardsHow To Combine Wooden And Composite Deck MaterialsNavigation FordeckingFlatten Joists To Avoid A Wavy DeckThe installation can be fairly easy — simply put on a silicon sealant to the end cap or on the end of the deck board, t