To soundproof a sliding barn door make sure there are no gaps or cracks that noise can travel through.
Sliding barn door gap.
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In the picture you show you could place one piece vertically on the wall side of the door on the end the picture was taken.
Generally speaking barn door tracks come in two sizes.
You can modify a door stop included to cover the gap between rails if you prefer a seamless look.
It looks like the gap is caused by the hardware for this barn style door which is a common scenario.
Make sure the doors are made from solid wood meaning a solid and not a hollow core.
This step may not be included in your hardware instructions if you bought them separately.
Screw a board to the bottom of the door you will have to remove the door.
Purchase twice the length of brush as the width of the door so that you can attach the brushes top and bottom.
Have a 1 4 overlap on the door to cover the gap where the noise is coming through.
Glue nail some flat molding wood with a 1 4 overlap on the door to cover the gap.
If you have a gap in the bottom of the barn door you can screw a board to the bottom of the door.
If you do you won t be able to get your door to completely clear your doorway.
You will have to remove the door for this process to be more accessible.
Don t get all excited about a big chunky barn door build a 40 wide one for a 6ft long door track.
Or you can get a track joiner if you want the doors to be able to slide to either side.
You can modify a door stop included to cover the gap between rails if you prefer a seamless look.
For the best seal my recommendation would be some pieces of weatherstripping or gasket.
This step may not be included in your hardware instructions if you bought them separately.
A door sweep and weatherstripping tape can be used to cover gaps.
The first thing that comes to mind for most people when they see sliding barn doors inside a house is how much noise gets through to the other room.
Install the soft close mechanisms before hanging the door slabs.
With the door closed measure the gap between the floor and the bottom of the door.
Or you can get a track joiner if you want the doors to be able to slide to either side.
You have to be careful with wood trim if it fills the gap it can scrape the doors as they slide by barn doors have to have a gap in order for the doors to work.