How to Hang a Prehung Door. Pre-hung doors are doors that come from the manufacturer installed in a door frame. Pre-hung doors are purchased with the. Tom Silva does a plumb job putting up a prehung door. turtlebaybiathlon.com: Knowing how to install a prehung door is important to get the job done right. If you don't follow these tips, your prehung doors could rub, not.
Mark the pre-hung door for the opening adding an inch or two for carpet to run underneath the door. Put painter's tape along the length of their mark (Image 1).