Vertical Iron Plank Double Barn Door basic architecture. Vertical planks with Iron Edge give the door additional support and balance. This double barn door features the Knotty Alder wood and the weathered Knotty Alder Barn Wood with a beautiful selection of finish options. The Knotty Alder Barn wood features distinctive Knotty Alder wood grains and a beautiful weathered texture that complements the rustic look of the barn door. Decorative clavos and straps are available, call us for details. Picture shown above with Ranch Brown finish and Vintage rolling hardware.