Hi Gator, Dan's information is correct. Stand the board on end. One of the reasons for it cupping is, when you lay it on a flat surface air can't circulate under the timber, hence it cups. That's why the timber you see in the lumber yard is stickered, so that air can circulate all around the timber. One other reason is the board may have been flat sawn, if it had been quarter sawn it would not cup. It could also have been badly kilned. Hope this helps Gator as I do not profess to be a technical writer, just what I remember from my apprentice days at college, hundreds of years ago. .
Rob Roy.