When we remodel manufactured home we almost always replace the interior doors with new and better ones.
Large gap between door and floor.
Check that the stud walls on either side are plumb before you get into bigger issues.
The larger the gap the more sound that seems to transfer between rooms.
This number is regardless of flooring.
The foam should be the same diameter as the width of the gap.
As we are focusing on uneven floors mostly you need to measure the size of multiple gaps your garage door has from the floor.
Press a closed cell foam backer rod into the gap starting at the corner.
First of all you have to decide on the size of the garage door bottom seal you require.
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.
Because smaller gaps will transfer the air as efficiently as larger gaps there is no real reason the gaps need to be 3 inches.
This allows for proper air exchange between rooms.
It is about a little less than a 1 4 of an inch.
Under all the door casings there is a gap between the casing and the hardwood floor.
This is a simple solution to your problem.
There is an approximately 1 5 gap at the bottom of the doors.
Shim it and nail it and hang the trim.
Pop the door and frame cut the jambs down by a half inch and re install with the jambs hard down.
This is the alternative to using a door sweep.
The door gap to the floor should be 5 8 to 3 4 inch.
Measure the gap between the door and the floor.
Reset the door so that it is level and plumb.
Here the gap is the distance between the floor and the bottom of the door.
If you have a large gap beneath the door use a wrap around door sweep.
They have long adjustable sides that can be moved.
Foam backer rod is a flexible rope that compresses to fill.
It should be measured from the floor surface to the bottom of the door.
If each room has individual air returns the numbers can be smaller for personal taste.
The head casing should cover the gap created up top although you might have to touch up the paint on the gyprock.
Open the door fully and slide on the door sweep at the bottom of the door.
This is what i particularly suggest for the front door to keep our.