Plan the installation so there will be about 1 2 to 3 4 in.
Recommended space between bottom of interior door and floor.
There are another 10 doors to hang and it will take too long if i do this.
I installed an interior door in a new not lived in yet home.
Find out the thickness of the finish floor and then calculate where the bottom of the door will be.
When the owner stood back he noticed a gap at the bottom of 1 1 4 in.
Allowing a gap at the bottom of a door cannot support proper airflow.
It has a protruding edge centered on the bottom that fills the gap between two different floors.
I put the flooring in first then installed a pre hung door.
If you are hanging a door on a finished floor you cut 3 4 off the bottom of the jamb then install.
That is a lot of room for unlevel you have there.
The standard i use is 1 2 over finish floors 3 4 is acceptable.
He says this is too much and wants me to remove the door cut the bottom of the jam off and reinstall.
If you are hanging a pre hung door on a bare subfloor you put the door right on the floor and install it.
Between a leaf of interior doors and the floor it is required to leave a gap of at least 2 2 5 cm to provide natural ventilation.
Of space under the door.
I have never seen a door set with that big of a gap unless it was to get past floors that were not level.
Either way it gives you about 3 4 clearance over the finished floor.
To fix the issue the doors need to be removed bottom of the jambs cut and reset the door.
If a room is not equipped with a cold air return it should then have a transfer air grill installed between the room and adjacent hallway which may already have a cold air return.
Usually setting the doorjambs on scraps of 3 8 to 1 2 in thick trim will put the door at the correct height.