The most convenient versions attach to the door usually with an elastic band so you don t have to set them into place all the time.
Sound insulation under door.
Fill the gaps with a draft stopper either purchased or homemade.
Using curtains for soundproofing a door works in very much the same way as it does for insulating a door.
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As with the front door gaps under interior doors let a lot of sound through as though the door is partially open.
Though most interior doors are 1 3 8 inch thick exterior doors are typically 1 3 4 inch thick.
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Doors made specifically for blocking sound typically utilize 1 2 inch thick particle board sound board an interior layer of lead and integral interlocking thresholds and sweeps.
Just be aware that replacing a 1 inch door with a thicker one will involve some carpentry modifications to the door jambs.
The key is to make sure that the fabric you use is thick and multilayered the more layers the better as this helps muffle sound waves you could even get a consider getting a specially made acoustic curtain.