Gene, Are they air dried or kiln dried? How thick are they? If the are still green or not fully dried, It is important to sticker and stack them. Air needs to circulate around them to keep equal moisture absorption around the board. Here is a picture of what I am talking about.
Also if they are still green, you need to coat the ends of the boards with paint to prevent the ends from checking or cracking. The checking occurs as the board releases moisture as it is drying. The paint will slow down the moisture from releasing and causing the checking.
