In a previous post about warping wood, I spoke of stacking and stickering to help keep thin woods from warping. This is done so air can circulate around the board to keep the moisture equal on both sides of the board. If more moisture is absorbed on one side than the other it will cup. So it is important to keep things constant on both side of the board.
Use stickers or sticks all the same thickness. Stack the boards with the stickers in between each layer.
The first picture is the Spanish Ceder used in the Gentleman's Box. The second pic is a shipment of 1/4" cherry, maple and walnut that I received from
www.ocoochhardwoods.com. The wood has been sitting that way for about two weeks now, and is now ready to be worked.