How to Build Lawn Furniture Out of Decking Boards eHow
Place the four 1-by-4-by-48-inch boards parallel to each other 1/4-inch apart on a work surface. These are the seat boards. Place the 1-by-4-by-16-3/4-inch boards across the seat boards so that they are perpendicular to them. These are the crosspieces. The outside edge of the crosspieces should be 12 inches from the ends of the seat boards.