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 sliding barn doors.
To soundproof a sliding barn door make sure there are no gaps or cracks that noise can travel through.
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.
Attaching acoustic panels to your barn doors is another effective option.
You can buy what s called a soundproof foam corner block amazon link.
During installation the plywood or mdf panel you intend to use should be cut to the precise measurements of the door.
However the down side to this option is the price.
Therefore investing in a solid core wood door can definitely help.
There are two types of acoustic panels.
Make sure the doors are made from solid wood meaning a solid and not a hollow core.
Else you are planning for an ugly scene.
Fiberglass panels and foam panels.
You can attach this acoustical foam block on the entire length of the door.
Foam panels are superb for reducing the amount of echo while fiberglass panels are much more efficient at blocking noise.
Soundproofing barn door using this method is a bit of a risk.
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.