Attaching acoustic panels to your barn doors is another effective option.
Soundproofing sliding barn doors.
However the down side to this option is the price.
There are two types of acoustic panels.
Foam panels are superb for reducing the amount of echo while fiberglass panels are much more efficient at blocking noise.
If you have a sliding barn door that looks like the one in the picture below then you will probably need a bit more than a small weather strip to stop the noise.
Soundproofing barn door using this method is a bit of a risk.
A door sweep and weatherstripping tape can be used to cover gaps.
First off the wood you are using should be heavy and thick that s the principle behind noise blocking.
Get a barn door style sliding door a thick door made of solid wood is better than glass or hollow wooden doors for blocking noise.
Weatherstrip the door as you can see weatherstripping the door is very important since it s something you have to do for every door you want to soundproof in general no matter what kind of door it is.
Fiberglass panels and foam panels.
Sliding barn doors are the easiest sliding doors to soundproof in my opinion which means that you have plenty of options to do this.
You can attach this acoustical foam block on the entire length of the door.
Make sure the doors are made from solid wood meaning a solid and not a hollow core.
Therefore investing in a solid core wood door can definitely help.
To soundproof a sliding barn door make sure there are no gaps or cracks that noise can travel through.