Installation Instructions
PREHUNG DOUBLE EXTERIOR DOOR
a
)
 Apply a triple bead of Silicone 
caulking to the sub-floor of the rough
opening 
(
fig.7
)
.
b
)
 Apply a second bead of caulking 
around the perimeter of the door
sill 
(
fig.8
)
.
e
)
 Open the active door and plumb the hinge side of the unit 
with a 6’ level 
(
fig.11
)
. 
NOTE: A door that is installed “Out of Plumb” is the most common 
reason for a door unit to leak air or water.
f
)
 Place shims behind the top hinge 
(
fig.12
) 
and tack the unit into place by 
removing one hinge screw from the top hinge and installing a 2-½" wood screw 
through the top hinge and into the rough opening 
(
fig.13
)
.
NOTE: We recommend the use of screws when installing your prehung unit. Screws allow you 
the opportunity for easy removal if adjustments need to be made to the installation.
a
)
 Moving the door frame as little 
as possible, carefully close the active 
door. Place shims behind the middle 
and lower hinge locations and each of 
the three corresponding hinge loca-
tions on the inactive door. 
(
fig.14
)
. 
NOTE: An even margin across the top of the header and down the center of the door will 
ensure that the door unit is square in the opening. Uneven margins will result in the door 
unit being out of square.
NOTE: The door slabs are heavy! During 
the initial installation, the weight will 
cause the jambs to twist, increasing the 
margin between the active door and the 
astragal. This twist must be shimmed out 
to ensure proper 1/8" margin between 
the active door and the astragal.
b
)
 Continue adding shims until 
the margin between the active door 
and the head jamb is even and the 
margin between the active door and 
the inactive door astragal are even. 
(
fig.15
)
.
c
)
 Apply a bead of caulking around 
the backside perimeter of the
door’s brickmould 
(
fig.9
)
.
d
)
 Using two people, set the sill into 
the rough opening. Center the
frame into the opening and tip the 
unit into place 
(
fig.10
)
.
3
)
 Setting the Door Unit
4
)
 Shimming the Door Unit
g. 7 g. 8
a
)
 Open the active door carefully and 
re-check for plumb. Finish screwing the hinge 
jamb into place by removing one screw from 
the middle and bottom hinges and installing 
a 2-½" drywall screw into those hinges at 
the shim locations 
and into the rough 
opening 
(
fig.16
)
. 
Install a second 
2-½" screw into 
the top hinge to 
prevent the door 
from sagging.
5
)
Fastening the Hinge-Side Active Door Frame
g. 16
g. 11
g. 13g. 12
g. 9
g. 10
a
)
Carefully open the inactive door and re-check for plumb. 
Make sure the bubble is dead center on the level, even a slight 
variation can cause major installation issues. Finish screwing the 
hinge jamb into place by removing one screw from the middle 
and bottom hinges and installing a 2-1/2" drywall screw into 
those hinges at the shim locations and into the rough opening 
(
fig.17
)
. Install a second 2-1/2" screw into the top hinge to 
prevent the door from sagging
.
6
)
Fastening the Inactive Door Side Frame
g. 17
g. 14
g. 15
JAMBS TWISTED
TOP VIEW
CORRECTED WITH SHIMS




