Thickness thicker door sweeps will block more of the noise.
Gap under interior door sound.
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So having something under your door even stuffing a towel in the gap should significantly decrease the amount of noise.
Soundproofing a door with door seals is an important aspect to soundproofing a room.
For the same reason you should soundproof your door to keep the sound inside.
Higher quality pre hung doors are usually manufactured with 1 5 clearance under the door as described above assuming the flooring will be premium as well in the 3 4 range.
Whether it s the gap under the closed door or the hollowed interior you ll notice that a door can let more sound in than all of the walls and floors combined.
But for finished conditions bedroom closets area with w to w carpeting ect 1 2 max.
You can add all the layers of mass loaded vinyl and gypsum to your wall that you want.
I think it is too big and think a 1 4 1 2 gap would accommodate any unevenness in our floors and allow us to use area rugs.
Though most interior doors are 1 3 8 inch thick exterior doors are typically 1 3 4 inch thick.
Sound travels quickly through gaps and doors are full of them.
As you know sound waves use any air gap as an invitation to proceed inside your room.
While the under door gap is usually only a few millimeters big it s still better to have thick rubber or vinyl blocking the entrance.
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.
My contractor just hung our fancy dancy un painted solid wood door slabs in my 100 year old house with solid hardwood floors throughout.
The thicker the door the better it reduces noise transfer.
There is an approximately 1 5 gap at the bottom of the doors.
Cheaper pre hung doors give about 1 1 25 clearance and this is because the rise of thinner floor systems for the mass consumer market.
Thickness will also ensure that the door sweep is more durable and won t crack as easily as it glides on the floor.