Learn tricks for straightening crooked boards; Making crisp, straight cuts on the board ends; And avoiding problems like hammer marks. Verkkothis tutorial shows you how to straighten deck boards that are cupping at the ends. After a few years, even a new deck can start to show wear and. Verkkoif you’re struggling with no space between deck boards, but are wondering: How do you widen the gap between deck boards?, read on to learn how.