Instructions / Assembly
Prehung Unit Installation in 6 Easy Steps
Be sure opening in the wall is 1 1/2” HIGHER than the complete 
door unit.
Plumb, square and level the wall opening BEFORE attempting to in-
stall the door unit. Wall must be in the same plane (NOT TWISTED) 
to ensure proper door installation and operation (
Figure A
).
Lifting the door assembly, center it in the wall opening and slowly tilt 
the unit into position from the side opposite the OUTSWING of the 
door (
Figure B
).
Check that HINGE SIDE is plumb, then nail HINGE SIDE ONLY at 
the top hinge, center hinge and bottom hinge locations.
Shim the STRIKE SIDE and nail through shims approx. 12” from the 
bottom. At the same time, be sure jamb is snug at the side and top 
of the door. The prepositioned spacer tabs will ensure proper clear-
ance (
Figure C
).
Set  and  using  nishing  nails,  nail  HEAD  CASING  (trim)  to  HEAD 
JAMB, leaving approx. 3/16” reveal (spacing from bottom of casing 
to bottom of jamb). Set and nail the SIDE JAMB, also with a 3/16” 
reveal. Countersink all nails. Paint, if desired, and install door latch 
hardware (
Figure D
).
Step 1
Step 2
Step 3
Step 4
Step 5
Step 6
For Proper Installation You Need:
measuring tape, screwdriver, hammer, level, framing square, 
6d and 10d nishing nails, wood shims, trim of your choice and 
latching/locking hardware.
INTERIOR DOORS
Prehung
Available in a variety of species and styles to match any decor
Ready for nishing
Before purchasing your prehung door unit from The Home Depot, 
check your opening measurements carefully. Measure the width (A) 
and the height (B) of the rough opening in two places shown. The 
rough opening should be 2” WIDER and 2 1/2” HIGHER than the 
door itself so you can shim and square the door frame.
PREHUNG UNIT SIZE SELECTOR
DOOR SIZE ROUGH OPENING WALL THICKNESS
18”X80” 20”X82 1/2” 4 9/16”
(46X203 cm) (51x210 cm) (12 cm)
24”X80” 26”X82 1/2” 4 9/16”
(61X203 cm) (66x210 cm) (12 cm)
28”X80” 30”X82 1/2” 4 9/16”
(71X203 cm) (76x210 cm) (12 cm)
30”X80” 32”X82 1/2” 4 9/16”
(76X203 cm) (81x210 cm) (12 cm)
32”X80” 34”X82 1/2” 4 9/16”
(81X203 cm) (86x210 cm) (12 cm)
36”X80” 38”X82 1/2” 4 9/16”
(91X203 cm) (96x210 cm) (12 cm)
Fig. A Fig. B
Fig. C Fig. D
INSTALLATION INSTRUCTIONS
Interior Prehung

