Finish the Job Inside and Outside
To complete the installation, carefully seal the 
interior against the weather and gap air infiltration.
Repair any damage to the outside of the house. 
Fill any old storm window holes or screen holes 
with putty. Use a paintable caulk so you'll be able to
re-finish the outside and seal it to the new window.
For non-
capped
Installations,
use suitable
sealing 
materials and
procedures to
create a
weather-tight
seal between
the newly
installed 
window 
mainframe,
and the 
opening into
which it is
installed.
Choose Your Sealant Carefully
You will be “sealing” the new window to the old frame
and that will be your weather barrier. Make sure the
sealant you choose adheres to both the window
material and the old frame material sufficiently to
make a lasting seal.
If you damage 
the  interior 
stops when you
remove them, or 
if old curtain rod
brackets have
them damaged, 
it may be wise 
to replace them. 
Most lumberyards
have a selection 
of mouldings that
will match any-
thing you might
have. With the
choices of pre-
finished mouldings
now available, it 
is even easier to
complete the job -
without painting 
or staining.
Capping The Finished Installation
Wherever possible, cover and seal the existing open-
ing frame, and/or the cavity created between the
newly installed window and the
existing wall with properly
installed capping materials. 
Be sure to establish a drip cap 
to divert water from the top,
around to the sides of the 
window installation.
Capped Installations should 
integrate or seal to the perimeter
of the new window or door to the
siding in an air and water-tight
manner.  However, allow for
ventilation, and for moisture to
escape from under the capping.
Window Fitters Guide to Window Installation 
35                ©2022 AWDI, LLC Do not reproduce without permission
Caulk
Head
Expander
Insulation
Caulk
Caulk
Sill
Support
Fig. 18
Fig. 19
Sealant
Capping
SAMPLE MANUAL

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