All cabinet-grade Lumber begins as a "green" Board (hat's been mill-sawed from a freshly felled tree - the Moisture Content of a green board will be 28 percent or greater, making it unsuitable for diy woodworking, since all wood shrinks, warps, and splits as it dries.To remove moisture from green boards, most manufacturers air-dry and kiln-dry them. Air drying reduces the moisture content