A while ago, I built a barn door with a steel frame that encased the wood for a client in Denver, Colorado. It turned out great, but one question kept coming up: How did I keep the bottom of the door from swinging around? Most barn door hardware kits include a T-track that gets screwed into the floor, with a slot routed into the bottom of the door for guidance. But since my door had a steel base, routing a groove wasn’t an option.