If you're concerned about noise transfer through your barn door, there are several ways you can soundproof it. Start by adding weatherstripping or a brush seal to the bottom of the door to help block out sound. If you have the space, you can also add acoustic foam or panels to the wall behind the door to help absorb sound. Another option is to install a barn door with a solid core, as this will help reduce noise. You could also consider installing a barn door with double-pained glass, which will help reduce noise.