The thicker the door the better it reduces noise transfer.
Under door sound insulation.
Though most interior doors are 1 3 8 inch thick exterior doors are typically 1 3 4 inch thick.
To install a door gasket you ll need to remove the door frame.
Just be aware that replacing a 1 inch door with a thicker one will involve some carpentry modifications to the door jambs.
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Door gasket for soundproofing doors.
If you notice any spaces under or around the doorframe then you should consider using a gasket.
They re easy to install and they block out all sound that enters around the door.
The thicker the door the better it reduces noise transfer.