Installation Instructions
PREHUNG DOUBLE EXTERIOR DOOR
Before applying casing to the interior of your door unit you will need to 
insulate around the frame opening. We recommend using “Fiberglass Blanket 
Insulation”. Do not use expanding foam, it will affect the margin around the 
door unit 
(
fig.33
)
.
Remove all dust and debris from the surface of the door. Lightly sand the
door surface with a ne sand paper. Wash the door with a mild detergent
and rise very well. Allow the door to dry completely. Apply a finishing coat 
of a high quality latex paint. Carefully follow all paint manufacturers’
preparation and finishing instructions. Do not paint the weatherstrip. Do not
close the door unit until the paint is completely dry. Please see door 
window for finishing instructions for the window frame.
For more information, including troubleshooting help, please visit
www.midwestmanufacturing.com
11
)
 Insulating the Door Unit
13
)
 Finishing Recommendations 14
)
 Troubleshooting Help
It is very important 
that you finish 
your prehung unit 
properly. To ensure 
maximum efficiency, 
please caulk at the 
following locations:
c
)
 Where the brickmould 
contacts the exterior wall. 
(
fig.36
)
.
Corner
Seal
e
)
 Make sure the corner 
seals are in place. If they 
have been removed during 
finishing, please make 
sure they are replaced 
(
fig.38
)
. There will be 
one seal per hinge jamb, 
and one that needs to 
be applied to the astragal. 
The astragal seal is 
included with the 
parts bag.
f
)
 Remove all excess
shimming material 
by first scoring the 
shims and then 
breaking them off 
with a hammer 
(
fig.39
)
.
g
)
 Apply 
casing to the 
unit as desired 
(
fig.40
)
.
b
)
 Where the brickmould 
contacts the frame.
(
fig.35
)
.
a
)
 Where the frame contacts 
the sill. 
(
fig.34
)
.
d
)
 At the nose of the sill, 
where it contacts the sill plate. 
(
fig.37
)
.
12
)
 Final Installation
g. 38
g. 34
g. 39
g. 40
g. 35
g. 37
g. 33
g. 36




