Floor Not Level, Unlevel/Uneven Floor Door Installation

Floor Not Level, Unlevel/Uneven Floor Door Installation

Question:

I’m setting a pre-hung interior wood door on an existing concrete slab in a basement. The slab is all over the place and floor not level. Other than leveling the slab, which isn’t an option, what is the best way to set the door so the head is level, cut the jamb on the high end or shim it on the low end? Haven’t taken a measurement yet, but could be a difference in elevation of 1/2″. I have 1 1/2″ clearance from the BO door to the BO jambs. Haven’t checked the clearance on the swing yet, but should be there if I only cut off 1/2″ from the jamb.

If the finished floor is already installed:

Floor not level? If the finished floor is already installed, the jamb legs may need to be cut to achieve the correct reveal around the door. Using a level and a shim, figure out if there is a difference in height across the width of the opening. If the floor is level, trim the jam so that the door will clear the finished floor by about 1/2″. If the floor is out of level, trim that much more off the jamb on the high side.

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