Installation Guide
Stand on the inside of the door and center the door in the 
opening. Shim tightly at the bottom corners of the door unit 
(Points A in Figure 18).
This will keep the door centered and the frame tight against the sill. Shim 
the top of the frame, behind the latch-side jamb (Point B in Figure 18). 
Install shims until there is a consistent 1/8" gap between the top of the 
operating door slab and the frame header. Shim at the top of the frame, 
behind the hinge-side jamb (Point C in Figure 18) to hold the door tight 
in its position relative to the frame. The door should operate freely with 
nothing but the shims holding it in place.
CAUTION: Do not open door panel greater than 30-degrees until 2-1/2" 
screws have been installed. (Points B, C, D, E & F in Figure 17).
From the outside and with the door closed, ensure that the frame 
is in a straight vertical plane (not twisted). To do this, check that 
the weather-stripping on the latch side is evenly compressed 
along the entire height of the door slab, without any pinching or 
gaps (Figures 8 and 9).
Once there is an even 1/8” gap across the top of the door slab and the 
weather-stripping is evenly compressed along the height of the door 
slab, proceed with the installation.
Shim at points D, E and F on the perimeter of the frame (Figure 18), until 
there is an even 1/8” gap on both sides of the operating door slab.
Drive the 2-1/2” installation screws, three on each exterior jamb of a 
fixed panel, through the exterior (stop) section part of the jamb, through 
the shims and into the studs. Note: If the door is factory-finished use 
the “Factory-Finished Door System” information for fastening through 
exterior jambs.
For units with two non-operable panels: Typically long security screws 
are used to install the dead bolt strike plate (Step 6).
 Required Tools & Materials
safety glass gloves 24” to 48” 
construction level
claw hammer measuring tape 24” framing square
caulking gun power screw gun with 
arrangement of screw 
bits
screw driver 
with arrangement of 
screw bits
2 tubes of paint grade 
exterior caulk
(latex, silicone or butyl)
wedge shaped 
shims
fiberglass insulation 
or low pressure 
window and door 
installation foam
corner seals 2-1/2” wood screws finish nails suitable for 
attaching interior and 
exterior trim
Ensure that the following conditions are met:
  Clean, clear work area 
   The rough opening (RO) is ideally 3/4" wider and 1/2" taller 
than the outside frame dimensions of the door unit. Units 
intended for installation in hurricane prone regions require 
less clearance between unit and RO (1/4" sides & top). 
  The RO is plumb, square and level 
   The old door frame has been completely removed in retro-fit installation
   When replacing existing door units, ensure products are 
properly disposed and recycled in safe manner. 
If disturbing existing paint, take proper precautions if lead paint is 
suspected (commonly used before 1979). For proper management 
of lead paint, see www.epa.gov/lead.
  The sub-floor area is clean, dry and level 
   The existing sub-floor area is at least 6" deep for 4-9/16" 
frames and at least 8" deep for 6-9/16" frames.
   Apply flashing in a manner to prevent entry of water into the wall 
cavity in accordance with flashing manufacturer’s instructions. 
Because a solid, level sub-floor is absolutely essential for proper 
door unit installation, do not proceed with the installation until the 
sub-floor is both solid and level.
Stand on the inside of the door and center the door in the 
opening. Shim tightly at the bottom corners of the door unit 
(Points A in Figure 10).
This will keep the door centered and the frame tight against the sill. 
Shim the top of the door on the latch side (Point B in Figure 10). 
Install shims until there is a consistent 1/8" gap between the top of 
the door slab and the frame header.
Shim the hinge-side of the frame (Point C in Figure 10). This will 
hold the door tight in its position relative to the frame. The door 
should operate freely with nothing but shims holding it in place.
CAUTION: Do not open door panel greater than 30-degrees until 
2-1/2" screws have been installed. (Points D, E, F & G in Figure 10).
From the outside and with the door closed, ensure that the 
frame is in a straight vertical plane (not twisted). To do this 
check that the weather-stripping on the latch side is evenly 
compressed along the entire height of the door slab without 
any pinching or gaps (see Figures 8 and 9).
B
F
G
G
F
A
C
E
E
D
A
X
Critical Point: Although all steps are critical, this symbol 
identifies procedures requiring extra attention.
Check Your Work: This symbol identifies when the work should 
be checked for correctness before continuing with installation.
PLEASE NOTE: Failure to install this unit in accordance with architect, 
design professional or product manufacturers instructions will have 
a direct effect on the units performance and/or long term wear. 
Installer shall be experienced in performing work required and shall 
be specialized in installation work similar to that required for this 
project. Warranty claims are subject to site inspections by a qualified 
manufacturer’s representation to establish probable cause and 
proposed corrective action. 
Step 1: Prepare Rough Opening Step 3: Prepare Door Unit Step 4: Place Door in Rough Opening Step 4: Place Door in Rough Opening
Step 2: Caulk the Sub-Floor
FIGURE 1: A clean, level, solid sub-floor area is essential to successful installation.
FIGURE 5: Place the sill in the opening first and then tilt the door up into the opening.
Figures 8 and 9: The weather-stripping on these doors is not evenly compressed.
FIGURE 3: Some door units will be supplied with plastic covers over the bottoms 
of the jambs. These must be removed before installation.
FIGURES 6 and 7: The exterior trim (brickmould) rests up against exterior 
sheathing or slides into the opening of exterior brick.
FIGURE 4: Some door units may be supplied with a “clip” or “plug” holding the panel aligned and 
closed during the initial installation steps. Do not remove at this time. Some door units may be supplied 
with a double headed nail or screw holding panel closed – this needs to be removed at this time.
FIGURE 2: Caulk is applied in three parallel lines running the width of the sill.
FIGURE 13: Install the shims in the correct locations and in the correct sequence.
FIGURE 14: Correct sagging until the flush bolt 
slides freely into the pre-drilled hole (not 
typical of most units) in the head/threshold.
FIGURE 10: Install the shims in the correct locations and in the correct sequence.
FIGURE 11: Proper position of shims at the bottom of the door (Points A).
FIGURE 12: Shims are placed above and below 
the dead bolt hole (points G in figure 10).
Remove all packaging materials such as nails, staples and screws. 
Stand on the outside of the doorway. With the exterior side of the door unit 
facing you, tilt the door unit toward you (Figure 5). The brickmould (not 
supplied with all units) should rest up against the siding of the exterior wall 
(Figure 6) and should slide into the RO of a brick home (Figure 7).
If door unit is supplied without a clip or plug holding 
door aligned and closed, do not leave the door wide 
open during installation. The weight of the door may 
cause it to fall and cause injury.
Step 5: Shim and Fasten Step 5: Shim and Fasten
Step 5B: For double doors with concealed top and bottom flush bolts
Stand on the inside of the door and center the door in the opening. 
Shim tightly at the bottom of the unit (Points A in Figure 13).
This will keep the door centered and the frame tightagainst the sill. Shim the 
top of the frame (at Points B in Figure 13). Install shims until there is a 
1/8
" 
gap between the topof the door slabs and the frame header. This will hold 
the door tight in its position relative to the frame. The door should operate 
freely with nothing but shims holding it in place.
CAUTION: Do not open door panel greater than 30-degrees until 2-1/2" 
screws have been installed. (Points C, D, E & F in Figure 13).
Door panels with glass inserts may sag toward the center. This is normal. To 
correct sagging, align the flush bolts on the fixed door with clearance in the 
header and sill. Most units do not have pre-drilled holes in the header and 
sill. Holes must be drilled. Slide top flush bolt up against header and bottom 
bolt down against threshold to mark. Mark where bolts make contact with 
header and sill with pencil. Drill holes on marks to receive bolts (1-1/2" deep 
minimum). Once holes are drilled, close panel and engage bolts making sure 
they extend far enough to secure unit. 
Step 5A: For single doors
Step 5: Shim and Fasten
For all door types, it is essential that the frame is in a 
straight vertical plane and is not twisted. Check alignment 
using this method: Stand on the outside of the door. 
Check that the weather-stripping on the latch side is 
evenly compressed along the entire height of the door 
slab without any pinching or gaps (Figures 8 and 9).
DO NOT utilize the wall to square and level unit. Unit must be 
square and level to insure proper operation and performance.
Instructions vary according to door type. Confirm which door type is 
being installed. Some door styles not available in all markets.
For single door unit, use Step 5A. For double door unit, use Step 5B. 
For single door unit with one or two sidelites, use Step 5C.
INFORMATION PANEL
How to Plumb the Door
How to Fasten the Door
After shimming, the door is fastened to the studs by installing screws 
through the jambs, shims and into the stud.
Screws located in hinge or strike position shall be placed in the 
thin (rabbet) section of frame, other screws shall be placed in 
thick (stop) section of frame. Wide frames should be attached 
with a screw in both sections of the frame to minimize rotation.
When shims are properly installed, the frame should not move 
or twist when the screws are tightened and counter-sunk, thus 
maintaining the 1/8
“ gap between the edge of door panel and 
frame. If there is any movement, loosen the screws and shim 
tighter to maintain the 1/8” gap, then retighten the screws.
Step 5: Shim and Fasten
Shim behind the latch-side jamb (Points F in Figure 10) approximately 
8" from the top and bottom of the frame. Install shims until there is 
an even 1/8" gap between the jamb and the edge of the door slab 
along the door. Shim behind the latch-side jamb (Points G in Figure 
10) just above and below the dead bolt hole, maintaining the 1/8" gap 
(Figure 12). Screw 2-1/2" installation screws through the jamb and 
shims into the stud.
Proceed to Step 6.
When the shims are 
properly installed, the 
frame should not move 
or twist at all when the 
screws are tightened and 
counter-sunk thereby 
maintaining the 1/8" gap. 
If there is any movement, 
loosen the screws and 
shim tighter to maintain 
the 1/8" gap, then 
re-tighten the screws.
Ensure that there is an even gap across the top of the door slab. 
With the door closed and from the inside shim directly behind the 
vacant hinge screw hole in each hinge (Points D and E in Figure 
10) until there is a consistent 1/8" gap between the hinge-side jamb 
and the door slab edge along the entire height of the door. Gap 
between the latch-side jamb and the door slab edge should be 
1/8" at the top and bottom of the door only. Drive one of the 2-1/2" 
screws supplied through the vacant hole in each hinge, through the 
jamb, shims and into the stud or rough buck (Figure 11).
Some dwelling designs/conditions may require special installation steps, consult your 
architect, design professional and/or product manufacturer for additional guidance.
Variations in threshold design may require that the caulk lines be 
applied directly to the bottom of the door unit to ensure a necessary 
weather-seal. Inspect the bottom of door unit to confirm it features a 
flat surface before caulking the sub-floor area.
Apply three 1/4" lines of caulk along the length of the sub-floor, the 
first line starting approximately 1" from the inside edge. The lines 
should be about 1" apart.
Door units featuring multiple door panels or glass inserts 
are heavier and more difficult to handle – do not attempt 
to handle without assistance.
single door 
(X for operable panel or O for non-operable panel)
A:
double door or single with one sidelite
(OX or XO for unit featuring operable panel with non-operable panel)
single with two sidelites 
(OXO for unit featuring operable panel with two non-operable panels)
C:
double door
(XX for unit featuring two operable panels)
B:
B
E
F
E
A
D
C
A
B
F
XX
Step 5: Shim and Fasten Step 5: Shim and Fasten
For units with only one non-operable panel attached on the latch side 
of the door: The second set of supplied screws are installed through the 
thin (rabbet) section of the jamb using the vacant hinge screw holes 
(Figure 19). Typically long security screws are used to install the dead 
bolt strike plate (Step 6).
For units with only one non-operable panel attached on the hinge side 
of the door: 2-1/2" screws are installed through the thick section of the 
jamb through the shim and into the stud approximately 8" from the top 
and bottom of the jamb. Shim just above and below the dead bolt hole 
and drive the supplied 2-1/2" installation screws through the dead bolt 
strike plate (Step 6).
When shims are properly installed, the frame should not move 
or twist at all when the screws are tightened and counter-sunk, 
thus maintaining the 1/8” gap. If there is any movement, loosen 
the screws and shim tighter to maintain the 1/8” gap, then re-
tighten screws.
B
E
F
F
E
A
C
D
D
D
A
Proceed to Step 6.
FACTORY-FINISHED DOOR SYSTEM
If the inside of the jamb is not accessible, a 
1/8
" holes must be drilled through the 
factory-finished exterior jamb, 
1/4
" deep at all points where the door system is 
shimmed (three on each exterior side of a non-operable panel, Figure 20). Drive 
2-1/2" installation screws, through the drilled holes in the exterior thick (stop) 
section of the jamb, through the shims and into the studs (Figure 21). Some local 
jurisdictions may require additional security screws through hinges and strikes.
XO
Step 5C: For door with sidelites
Remove this 
portion of plug 
prior to installing.
Note: Units 
intended for 
installation 
in hurricane 
prone regions 
may require 
additional points 
of attachment. See 
local retailer for 
installation sheet 
supplement.
Note: Units 
intended for 
installation 
in hurricane 
prone regions 
may require 
additional points 
of attachment. See 
local retailer for 
installation sheet 
supplement.
Note: Units 
intended for 
installation 
in hurricane 
prone regions 
may require 
additional points 
of attachment. See 
local retailer for 
installation sheet 
supplement.
Shim behind the vacant hinge screw hole in the top hinge (Point C 
in Figure 13) to align the top flush bolt with the clearance hole in the 
header (Figure 14). Secure with the 2-1/2” installation screw supplied, 
through the hinge jamb and into the stud.
From the outside and with the door closed, ensure that the frame 
is in a straight vertical plane (not twisted). To do this check that the 
weather-stripping on the astragal side is evenly compressed along 
the entire height of the door slab without any pinching or gaps (see 
Figures 8 and 9).
Standing on the inside, shim behind each of the vacant hinge screw holes 
in both the top and bottom hinge on the operating door (Points E in 
Figure 13) until there is a consistent 1/8" gap along the entire height of the 
door between the operating door and the passive door. There should also 
be a 1/8" gap between the top of each door slab and the header.
When shims are properly installed, the frame should not move or twist 
when the screws are tightened and counter-sunk, this maintaining the 
1/8" gap. If there is any movement, loosen the screws and shim tighter to 
maintain the 1/8" gap, then retighten the screws.
Install two 2-1/2" screws along the head jamb of double door systems for 
additional reinforcement. Screws should be installed above center of each 
panel. (Figures 17 and 18).
Using the supplied 2-1/2" installation screws, drive a screw through the 
vacant holes in both the top and bottom hinge on the operating door 
(Points E in Figure 13), through the jambs and into the stud.
Shim behind the vacant hinge screw holes in each of the center 
hinges (Points F in Figure 13) and secure using the supplied 2-1/2" 
installation screws.
3
3
3
3
3
3
3
3
SIDE-HINGED DOOR UNIT 
INSTALLATION INSTRUCTIONS
masonite.com
 Lift out the plastic filler strip with a flat head screw driver. Loosen 
the Phillips screws and adjust strikers to the desired location. Tighten 
Screws. Reinstall plastic strips. (Plastic strip may need trimming.)
Proceed to Step 6.
If there is a gap between the 
threshold and weatherstrip block 
around the foot bolt, the hole is not 
deep enough (the weatherstrip block 
must touch the threshold to properly 
seal the unit). Shim tightly behind 
the vacant hinge screw hole in the 
bottom hinge (Point D in Figure 13) 
until the lower flush bolt slides freely 
into the clearance hole in the sill. 
Secure the door by driving a 2-1/2" 
installation screw supplied, through 
the hinge and jamb and into the 
stud. If the flush bolt does not slide 
freely, loosen the screw, shim more 
tightly and then tighten the screw.
FIGURE 15: The gap between the door slabs 
and the head is not evenly aligned.
FIGURE 16: The gap between the door 
slabs and the head is evenly aligned.
FIGURE 17: Aluminum Astragal 
Strike Plate adjustment.
FIGURE 19: Install 2-1/2” screws 
through the lock jamb into the shim 
and stud minimum of 3 locations 
FIGURE 20: Pre-finished 
systems must have holes drilled 
before screws are installed.
FIGURE 21: Drill holes 
through the exterior jamb 
on factory-finished jambs 
and fill in holes with fill stick 
provided in hardware bag.
FIGURE 18: Install shims in the correct location and in the correct sequence.
MIC-18124-Install-Instructions.indd 1 7/13/18 11:03 AM


