Fresh cut Southern pine lumber from a sawmill is green. The green lumber must be stacked in a certain order to dry the lumber properly. Southern pine lumber not stacked and dried properly will grow mold and warp. Left unattended, in an improperly stacked pile, the fresh Southern pine lumber will begin to rot in a few months. Once properly dried, Southern pine lumber is strong, attractive and ready for installation. Drying times for stacked Southern pine depend on environmental conditions. In most cases, nine months must pass before using the lumber.
Set the four concrete blocks on a firm and level surface in a square 4 feet by 4 feet.
Place the two 4-by-4-by-8-foot long posts parallel to each other on the concrete blocks. Allow 2 feet of the horizontal posts to overhang the blocks on each end.
Begin stacking the green Southern pine boards on top of and across the horizontal posts. Keep identical thickness boards in a single layer. Do not mix different thicknesses in a layer. Leave a 1-inch air space between each board. Continue stacking the single layer of boards to the end of the horizontal post. The length of the first stack layer is approximately 8 feet long.
Arrange the 1-by-1-by-8-foot furring strips on top of the first layer. Place the first furring strip across the layer of boards 2 inches from the end. Set subsequent furring strips one foot on center across the boards until you reach the other end. Set the last furring strip 2 inches from the other end of the boards. You must have nine furring strips evenly spaced down the first layer to properly support the next layer of boards.
Stack the remaining Southern pine lumber in the same fashion. A layer of boards separated by the 1-inch thick furring strips. All board layers must have a 1-inch spacing between the edges. This allows for complete airflow around the boards.
Cover the stack of drying boards with the dark color tarp. Weigh the tarp down with old boards or mis-cuts from the sawmill. Allow the edges of the tarp to blow in the breeze. In other words, do not weigh the edges of tarp down, which will retain moisture in the boards.