Installation Guide
Before you begin
Remove the packaging and take the following precautions with the door:
1. Prehung interior doors can be installed immediately. If you are not installing immediately, store your door flat on a level surface, in a clean, dry,
well-ventilated area.
2. Avoid excessive warping or dr
ying. Do not store or install your prehung door in a damp, or freshly dry-walled building. Keep the door at least 10 feet
away from heating registers, and away from direct sunlight.
3. Handle your prehung door with clean hands or gloves, and lift rather than drag it. The precautions you take now will make finishing and
installation much easier later. (Consult your retailer for information on finishing instructions.)
Cross section of a typical door installation
All parts are seen in position in this horizontal section drawing. Note that the
hinge pin protrudes about 1/8" beyond the door; there are both left-hand and
right-hand hinges for doors that open from either the left or the right.
Doorstops fit snugly against the closed door (they are installed with the door
in the closed position). The casing is set back slightly from the edge of the
jamb to allow removal of the hinge pin. The leading edge of the door is beveled
to give the door clearance to swing without leaving a visible gap between the
closed door and the jamb on the outside. Prehung doors come hinged to their
jambs.
Tools Required
All you need is a hammer, Phillips screwdriver, 24" level, 24" framing square,
nail set, wooden shims, 8d and 16d finish nails, putty knife and wood filler.
Step 1. Rough Opening
Before you start, check to make sure that the rough opening is 1/2" wider than
the unit width & 1/2" higher than the unit height. This will allow you to shim
and square the door frame easily. Door casing will cover the gap between the
rough opening & the door frame.
INSTALLATION INSTRUCTIONS FOR INTERIOR PREHUNG DOORS
Make sure:
1. The threshold is level
2. The hinge side of the rough
opening is plumb
3. The head is square to the hinge
side of the rough opening
Center the prehung unit into the rough
opening, bottom first.
When the door opens to
you, and the knob is on
the left, it is a left hand
door.
When the door opens to
you, and the knob is on
the right, it is a right hand
door.
STUD ROUGH OPENING (R.O.) ALLOWANCES
UNIT DIMENSIONS R.O. WIDTH R.O. HEIGHT
18" - 19-1/2" x 81-1/2" 20" 82"
20" - 21-1/2" x 81-1/2" 22" 82"
24" - 25-1/2" x 81-1/2" 26" 82"
28" - 29-1/2" x 81-1/2" 30" 82"
30" - 31-1/2" x 81-1/2" 32" 82"
32" - 33-1/2" x 81-1/2" 34" 82"
36" - 37-1/2" x 81-1/2" 38" 82"
Flat Jamb Split Jamb
Casing
Starting approximately 6" from the top
of the frame, nail the hinge side in
place first, through the jamb and shim
ensuring that the frame is square and
plumb. Use an 8d finishing nail. To
permit easy withdrawal at a later stage
of installation, do not drive the nail all
the way in. Place a second nail 6"
from the bottom and a third in the
middle of the frame.
Move to the lock side of the frame.
Shim and then repeat Step 5. Nail
through the jamb and the shim 6" from
the top, 6" from the bottom and at the
strike. Use a shim behind each nail.
Secure header with shims and nails.
Position wooden shims between the
rough opening and the header. Nail
into position through the shims using
the 16d finishing nails. (Step 6) Note:
Leave the nail heads sticking out
slightly in case they have to be
removed later.
If the gap between the door and
frame is not equal all the way down,
adjustments are needed. Remove the
nails at the top or the bottom of the
frame and tap the frame over using a
hammer until the gap is equal.
Further shimming may be required.
Then re-nail. Once you are sure that
the frame is square, you are ready for
final installation and can countersink
the nails previously left in position.
(Steps 5, 6,and 7)
Step 5. Nail Hinge Side
of Frame
Step 2. Determine Door Swing Required Step 3. Square and Plumb
Rough Stud Opening
Step 6. Nail Lock Side
of Frame
Step 7. Nail the Remainder
of the Frame
Step 8. Making Adjustments
& Final Installation
Step 4. Install Pre-Hung Unit
Into Rough Opening
Left
Hand
Door
Right
Hand
Door
As
viewed
from
the
Interior
Casing
Door
Stop
Door
One Piece
Flat Jamb
Two Piece
Split Jamb
07-0035aHMD Printed in USA 2/07
1011
Masonite Helpline 1-800-663-Door (3667)
9:00 am - 9:00 pm Monday - Saturday
10:00 am - 4:00 pm Sunday, EST
website : www.masonite.com