Though most interior doors are 1 3 8 inch thick exterior doors are typically 1 3 4 inch thick.
Sound insulation under door.
Just be aware that replacing a 1 inch door with a thicker one will involve some carpentry modifications to the door jambs.
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.
Fill the gaps with a draft stopper either purchased or homemade.
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The thicker the door the better it reduces noise transfer.
Using curtains for soundproofing a door works in very much the same way as it does for insulating a door.
You can actually go one step further than a solid core door and buy a sound blocking door.
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.
As with the front door gaps under interior doors let a lot of sound through as though the door is partially open.
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