You can actually go one step further than a solid core door and buy a sound blocking door.
Under door sound insulation.
To install a door gasket you ll need to remove the door frame.
Sound is amplified as it travels through gaps.
Get it as soon as wed sep 30.
The thicker the door the better it reduces noise transfer.
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.
They re easy to install and they block out all sound that enters around the door.
Magzo door draft stopper 36 under door draft blocker noise reducer air stopper heavy duty door bottom insulation sound proof cold weather door snake draft blocker 36in x 3in beige 4 5 out of 5 stars 2 398.
Maxtid under door draft stopper 32 to 38 inches grey adjustable insulation sound proof door air draft blocker for noise light smell stopper 4 0 out of 5 stars 4 915 19 99 19.
Just be aware that replacing a 1 inch door with a thicker one will involve some carpentry modifications to the door jambs.
If you notice any spaces under or around the doorframe then you should consider using a gasket.
Norsmic car sound deadening roller 0 7lb extremely smooth sound insulation roller metal noise deadening sound deading tool 1pc 1 69 inch by norsmic 9 99 9.
The thicker the door the better it reduces noise transfer.
Door gasket for soundproofing doors.