I am getting ready to install standard height interior prehung doors. I will have carpet installed afterwards and would like to set the doors at a good "standard" height to prevent having 1.) a big gap under the door and 2.) hopefully not have to take doors off and cut them down. Being a prehung door, it appears there is 3/4" of space already created due to the door jambs being longer than the slab.
I know I will have the best padding available for my carpet but I believe that is only 1/2" thick then a fairly soft (high shag) carpet which I would guess is 5/8 to 3/4" long carpet strands?…though I do not know for sure how that all can be used to calculate the door height for sure. SO I was hoping there is a good standard to use assuming carpet will be installed under the door slab.
Best Answer
Most places set the jambs on a scrap piece of 1/2" plywood, setting the bottom of the door at a minimum of 1 1/4" from the subfloor. If the subfloor is not level, make the lowest side a little higher, so the gap will be slightly bigger.